Dokument-ID Dokumenttyp Autoren/innen Persönliche Herausgeber/innen Haupttitel Abstract Auflage Verlagsort Verlag Herausgeber (Institution) Erscheinungsjahr Titel des übergeordneten Werkes Jahrgang/Band ISBN Veranstaltung Veranstaltungsort Beginndatum der Veranstaltung Enddatum der Veranstaltung Ausgabe/Heft Erste Seite Letzte Seite URN DOI Lizenz Datum der Freischaltung OPUS4-229 Forschungsbericht Wäsche, Rolf; Köse, Fatma Einfluß der Verfahrensparameter beim Gelcasting auf die Entstehung bruchauslösender Gefügefehler in hochreinen Aluminiumoxidkeramiken Es wird die Untersuchung des Entlüftungsvorgangs in Keramikschlickern beschrieben, die Teil des Gelcastingprozesses zur Herstellung hochfester Aluminiumoxidkeramiken sind. Ziel der Untersuchung war es, den Einfluss von Viskosität und Entlüftungszeit als prozessvariablen auf die Entstehung von bruchauslösenden Fehlern im Gefüge zu verdeutlichen. Bremerhaven Wirtschaftsverlag NW Bundesanstalt für Materialforschung und -prüfung (BAM) 1997 221 978-3-89429-036-4 1 54 urn:nbn:de:kobv:b43-2294 http://www.gesetze-im-internet.de/urhg/index.html 2015-06-18 OPUS4-292 Forschungsbericht Wäsche, Rolf; Habig, Karl-Heinz Physikalisch-chemische Grundlagen der Feststoffschmierung - Literaturübersicht - Die für einen erfolgreichen Einsatz von Festschmierstoffen zur Minderung von Reibung und Verschleiß systembestimmender Parameter wie Last, Geschwindigkeit, Temperatur, umgebende Atmosphäre, Filmbildung und -haltung sowie die Anwendungstechnologien werden dargestellt, ferner Modellvorstellungen zum Verschleißverhalten von Festschmierstoffen im Hinblick auf konkrete Anwendungsfälle diskutiert. Bremerhaven Wirtschaftsverlag NW Bundesanstalt für Materialforschung und -prüfung (BAM) 1989 158 978-3-88314-889-X 1 112 urn:nbn:de:kobv:b43-2921 http://www.gesetze-im-internet.de/urhg/index.html 2015-06-03 OPUS4-577 Zeitschriftenartikel Dörfel, Ilona; Wäsche, Rolf; Rabe, Torsten; Steinborn, Gabriele Tribological Induced Microstructural Changes in Subsurface Layers of Si3N4-Based Materials Aedermannsdorf Trans Tech Publ. 1994 Key engineering materials 89-91 763 767 2016-02-19 OPUS4-900 Zeitschriftenartikel Wäsche, Rolf; Klaffke, Dieter Wear of multiphase SiC based ceramic composites containing free carbon Ceramics are of increasing interest for application in many branches of technique. In order to improve the tribological performance of ceramic materials, composites on the basis of silicon carbide with different amounts of titanium carbide, boron carbide, titanium diboride and free carbon in the form of graphite were manufactured by a reaction sintering process. The friction and wear behaviour of these composites was investigated with oscillating sliding motion in unlubricated tests at room temperature on different levels of relative humidity. Additional tests were performed under water lubrication, revealing the superior behaviour of composites for special test conditions. A major influence of the free carbon on friction or wear behaviour was not observed. The tribological behaviour in air as well as under water is mainly dependant on the amount of titanium phases. Amsterdam Elsevier 2001 Wear 249 220 228 10.1016/S0043-1648(01)00566-X 2016-02-19 OPUS4-979 Zeitschriftenartikel Wäsche, Rolf; Naito, M.; Jahanmir, S. TWA 27 Characterization Methods for Ceramic Powders and Green Bodies National Institute of Standards and Technology The Versailles Project on Advanced Materials and Standards 2000 VAMAS Bulletin 23 21 27 2016-02-19 OPUS4-1732 Beitrag zu einem Tagungsband Kautek, Wolfgang; Rudolph, Pascale; Brzezinka, Klaus-Werner; Wäsche, Rolf Meunier, M. Physical chemistry of the femtosecond and nanosecond laser-material-interaction with SiC and a SiC-TiC-TiB2 composite ceramic compound The interaction of nanosecond laser pulses in the ultraviolet wavelength range and femtosecond laser pulses in the near-infrared region with the direct semiconductor SiC and the composite compound SiC-TiC-TiB2 was investigated in respect to resulting physicochemical processes. Surface analytical techniques, such as XPS, µ-Raman, and EDX were used to identify the chemical changes between untreated and laser-treated areas. Single-pulse irradiation led to material modifications in the condensed state in most instances. Multi-pulse results differed depending on the pulse duration. In the nanosecond case, melting of the surface and redeposited material (debris) were observed. With femtosecond pulses instead, only negligible melting and few debris could be detected. Additionally, periodic structures (ripples) appeared, with parallel orientation and in most cases two different periodicities for a particular material. Laser ablation of all the studied compound materials exhibited preferential ablation of the lighter component elements. Crystal structure changes of the irradiated surface were observed as a consequence of laser-induced melting and resolidification. An oxidation process interfered with all this processes so that unstoichiometric oxides were formed. Amsterdam Elsevier European Materials Research Society 2002 Physics and chemistry of advanced laser materials processing 208/209.2003,1 Symposium D - European Materials Research Society Strasbourg, France 2002-06-18 2002-06-21 1 1 2016-02-19 OPUS4-2791 Zeitschriftenartikel Rudolph, Pascale; Brzezinka, Klaus-Werner; Wäsche, Rolf; Kautek, Wolfgang Physical chemistry of the femtosecond and nanosecond laser-material interaction with SiC and a SiC-TiC-TiB2 composite ceramic compound The interaction of nanosecond laser pulses in the ultraviolet wavelength range and femtosecond laser pulses in the near-infrared region with the semiconductor SiC and the composite compound SiC–TiC–TiB2 was investigated. Surface analytical techniques, such as XPS, depth profile (DP), and micro-Raman spectroscopy (?-RS) were used to identify the chemical changes between untreated and laser-treated areas. Single-pulse irradiation led to material modifications in the condensed state in most instances. Multi-pulse results differed depending on the pulse duration. Crystal structure changes were observed as a consequence of laser-induced melting and resolidification. In air contact all components underwent oxidation reactions according to thermodynamic expectations. Exceptions were observed under exclusion of oxygen, SiC was reduced to elemental Si. Amsterdam North-Holland 2003 Applied surface science 208-209 285 291 10.1016/S0169-4332(02)01356-9 2016-02-19 OPUS4-720 Beitrag zu einem Sammelband Wäsche, Rolf; Suchantke, Christian; Yarim, Rasim Schulte, K.; Kainer, K. Sintern von Verbundwerkstoffen im System SiC-TiC-TiB2 Weinheim Wiley-VCH Deutsche Gesellschaft für Materialkunde 1999 Verbundwerkstoffe und Werkstoffverbunde 1999 3-527-29967-X 12. Tagung "Verbundwerkstoffe und Werkstoffverbunde" Hamburg, Deutschland 1999-10-05 1999-10-07 189 194 2016-02-19 OPUS4-848 Beitrag zu einem Tagungsband Klaffke, Dieter; Hartelt, Manfred; Wäsche, Rolf Bartz, Wilfried J. Non-Oxide Ceramics as Tribo Materials - Analysis of Wear Mechanisms under Oscillating Sliding Conditions in Various Atmospheres Ostfildern Techn. Akad. Esslingen 2000 Tribology 2000 - plus 3 3-924813-44-2 12th International Colloquium Tribology Esslingen, Germany 2000-01-11 2000-01-13 1755 1763 2016-02-19 OPUS4-1432 Zeitschriftenartikel Wäsche, Rolf Feste Schmierstoffe für hohe Temperaturen - Eine Literaturübersicht Renningen Expert Verlag Gesellschaft für Tribologie 1989 Tribologie und Schmierungstechnik 36 3 145 151 2016-02-19 OPUS4-1433 Beitrag zu einem Sammelband Wäsche, Rolf; Steinborn, Gabriele; Klaffke, Dieter Somiya, S. Gas pressure sintering of SiCp-alumina composites made by gelcasting and their tribological properties COMPOSITE MATERIALS OF A 99.7 % ALPHA-ALUMINA MATRIX WITH PLATELETS OF SILICON CARBIDE (SICP) HAVE BEEN PREPARED BY GELCASTING. DENSIFICATION WAS CARRIED OUT BY GAS-PRESSURE SINTERING WITHOUT FURTHER SINTERING AIDS. FIVE DIFFERENT COMPOSITIONS WITH 0, 5, 10, 15, AND 20 VOL.% SICP RESP. HAVE BEEN INVESTIGATED AND TRIBOLOGICAL PROPERTIES WERE CHARACTERIZED. INCREASING AMOUNT OF SICP AS RIGID PARTICLES IN THE FINE GRAINED MATRIX COMPLICATE THE DENSIFICATION PROCESS. WITH THE APPLICATION OF 50 BAR AR PRESSURE DURING THE FINAL SINTERING STEP AT A TEMPERATURE OF 1700 DEGREE C THE DENSITY OF THE SAMPLES COULD BE INCREASED BY 3-5%. INVESTIGATION OF THE TRIBOLOGICAL PROPERTIES AGAINST STEEL AS A COUNTERBODY UNDER UNLUBRICATED OSCILLATING SLIDING CONDITIONS SHOWED A HIGH COEFFICIENT OF FRICTION AND AN INCREASING WEAR RATE UP TO A SICP CONTENT OF 10 VOL. % . AT 15 AND 20 VOL. % SICP RESP. BOTH THE COEFFICIENT OF FRICTION AND THE COEFFICIENT OF WEAR DROP DOWN. Amsterdam Elsevier International Union of the Materials Research Societies 1994 Composites, grain boundaries and nanophase materials 0-444-81993-2 3rd IUMRS International Conference on Advanced Materials (ICAM) Tokyo, Japan 1993-08-31 1993-09-04 16B 791 794 2016-02-19 OPUS4-1434 Zeitschriftenartikel Wäsche, Rolf; Steinborn, Gabriele Characterisation of the secondary properties of alumina - measuring the isoelectric point by a streaming potential method Baden-Baden Göller Deutsche Keramische Gesellschaft 1997 Ceramic Forum International : cfi 74 5 235 239 2016-02-19 OPUS4-1435 Zeitschriftenartikel Wäsche, Rolf; Steinborn, Gabriele Influence of Slip Viscosity on the Mechanical Properties of High Purity Alumina made by Gelcasting Aedermannsdorf Trans Tech Publ. 1997 Key engineering materials 132 374 377 2016-02-19 OPUS4-1437 Zeitschriftenartikel Wäsche, Rolf; Abe, H.; Naito, M.; Hackley, V.; Hotta, Y. Influence of particle size and solid loading on the determination of the isoelectric point (IEP) of ceramics powders by different methods The isoelectric point is a material property for the characterization of acid-base behavior of the powder surface. The IEP of two alumina powders (AKP-30, Grade A) with different particle size characteristics in aqueous suspension has been determined by colloid vibration current (CVI) and particle charge detection (PCD) methods in moderately concentrated suspensions in order to qualify these methods for a future standardization. The solid loading of the suspensions were 1 and 5 vol%. The comparison of the IEP determined by PCD and CVI was in good agreement. However, the solid loading dependence of IEP and a large IEP hysteresis (at 1 vol%) were observed, which do not allow a proper determination of the IEP. The recording of the potential curve and therfore the determination of the IEP with CVI was difficult for the suspension of Grade A powder due to formation of agglomerates at pH values near the pHIEP. Aedermannsdorf Trans Tech Publ. 2002 Key engineering materials 206-213 7th Euro Ceramics - Conference and Exhibition of the European Ceramic Society (ECerS) Brugge, Belgium 2001-09-09 2001-09-13 3 6 10.4028/www.scientific.net/KEM.206-213.3 2016-02-19 OPUS4-1438 Beitrag zu einem Sammelband Yarim, Rasim; Wäsche, Rolf; Woydt, Mathias Franek, F. Wear Behaviour of SiC-TiC-TiB2 Ceramic Composites Sliding against SiC up to 800°C and 2m/s Wien ÖTG Österreichische Tribologische Gesellschaft 2001 Tribology 2001 3-901657-07-X 2nd World Tribology Congress ; 2nd WTC 2001 Vienna, Austria 2001-09-03 2001-09-07 1(?) 4(?) 2016-02-19 OPUS4-1439 Beitrag zu einem Sammelband Wäsche, Rolf; Klaffke, Dieter Andersson, P. Tribological Behaviour of Multiphase Ceramic Composites in the System Si-Ti-B-C Containing Free Carbon Espoo VTT, Technical Research Centre of Finland Valtion Teknillinen Tutkimuskeskus, Espoo / Valmistustekniikka 2000 Proceedings of the 9th Nordic Symposium on Tribology / Vol. 1 1 951-38-5276-8 9th Nordic Symposium on Tribology ; 9th NORDTRIB 2000 Porvoo, Finland 2000-06-11 2000-06-14 200 186 195 2016-02-19 OPUS4-1440 Zeitschriftenartikel Wäsche, Rolf; Klaffke, Dieter Ceramic particulate composites in the system SiC-TiC-TiB2 sliding against SiC and Al2O3 under water The tribological behaviour of SiC, SiC-TiC and SiC-TiC-TiB2 was determined in oscillating sliding against SiC and -Al2O3 in water at room temperature. The tribo-systems with the composite materials containing TiC and TiB2 differ significantly from the systems with the single phase SiC: The wear is reduced and the friction is increased. The wear reduction up to a factor of 10 is mainly due to the formation of an oxide film containing titanium oxides which is soft, stable in water and well adhering to the bulk material. This oxide film is transferred to the alumina ball but not to the silicon carbide ball. Oxford Butterworth-Heinemann 1999 Tribology International 32 4 197 206 10.1016/S0301-679X(99)00033-X 2016-02-19 OPUS4-1441 Beitrag zu einem Tagungsband Wäsche, Rolf; Naito, M. Puri, V.; Adair, J.; Knobloch, C.; Huang, C. Electrokinetic Characterization of Aqueous Ceramic Suspensions 1999 Fine powder processing '99 Fine Powder Processing Conference '99 State University, PA, USA 1999-09-20 1999-09-22 177 183 2016-02-19 OPUS4-1813 Beitrag zu einem Tagungsband Steinborn, Gabriele; Wäsche, Rolf; Reichel, U. Fabrication of porous ceramics made from nano sized alumina powder by gelcasting The gelcasting process was used for manufacturing porous ceramic bodies from nano sized powders. 3 different powders with specific surface areas between 12 and 30 m²/g were used. Solid content of the corresponding slurries was dependent on the milling procedure and the use of a suitable dispersant. For bimodal GradeA powder solid content was as high as 58 vol%. For sintering temperatures between 1250 and 1600°C the porosity varied between 45 and 20%, whereas the pore radii varied between 50 and 91nm. The grain size of crystallites in the sintered microstructures was about 1um. The reflection ratio for visible light increased in comparison to a reference sample made from conventional powder from 0.8 to 0.95 in the wavelenght range around 400nm. 2002 Proceedings of the 2nd International Conference on Shaping of Advanced Ceramics 2nd International Conference on Shaping of Advanced Ceramics Gent, Belgium 2002-10-24 2002-10-26 103 108 2016-02-19 OPUS4-2486 Zeitschriftenartikel Klaffke, Dieter; Wäsche, Rolf; Yarim, Rasim Tribological Behaviour of SiC-TiC-TiB2 Composites under Unlubricated Sliding Conditions Deal Coppin 2003 TriboTest 9-3 9 185 195 2016-02-19 OPUS4-3481 Zeitschriftenartikel Wäsche, Rolf; Klaffke, Dieter; Troczynski, T. Tribological performance of SiC and TiB2 against SiC and Al2O3 at low sliding speeds The friction and wear behaviour of a new developed, pressureless sintered TiB2 ceramic was studied in comparison to SiC against SiC and Al2O3 balls under unlubricated conditions at room temperature. Special attention was paid to the influence of relative humidity on friction and wear results. For both ceramics the coefficient of friction against both ball materials decreases with increasing humidity and is higher in tests against alumina than against SiC. The wear rate is affected significantly by humidity and decreases by one order of magnitude for Al2O3/SiC system and by 2 orders of magnitude for SiC/SiC system. For TiB2 wear rates are nearly not affected by humidity against both ball materials and are much smaller than for SiC. Amsterdam Elsevier 2004 Wear 256 695 704 10.1016/S0043-1648(03)00444-7 2016-02-19 OPUS4-2591 Beitrag zu einem Sammelband Klaffke, Dieter; Steinborn, Gabriele; Wäsche, Rolf; Wötting, G. Degischer, H.-P. Tribologische Untersuchungen an SiC- und Si3N4-basierten Keramiken Weinheim Wiley-VCH Deutsche Gesellschaft für Materialkunde 2003 Verbundwerkstoffe : 14. Symposium Verbundwerkstoffe und Werkstoffverbunde 3-527-30762-1 14. Symposium Verbundwerkstoffe und Werkstoffverbunde Wien, Österreich 2003-07-02 2003-07-04 545 550 2016-02-19 OPUS4-2517 Zeitschriftenartikel Klaffke, Dieter; Yarim, Rasim; Wäsche, Rolf Effect of Pre-oxidation on Friction and Wear Behaviour of a SiC-TiC-TiB2 composite Espoo Metallilaboratorio 2003 Tribologia = Finnish journal of tribology 22 12 20 2016-02-19 OPUS4-2536 Zeitschriftenartikel Klaffke, Dieter; Yarim, Rasim; Wäsche, Rolf Einfluss einer Voroxidation auf das tribologische Verhalten keramischer Komposits Renningen Expert Verlag Gesellschaft für Tribologie 2003 Tribologie und Schmierungstechnik 50 2 34 39 2016-02-19 OPUS4-3057 Beitrag zu einem Sammelband Wäsche, Rolf; Yarim, Rasim; Klaffke, Dieter; Hartelt, Manfred Bartz, Wilfried J. Oscillating Sliding Wear Behaviour of SiC, TiC, TiB2, 59SiC-41TiB2 and 52SiC-24TiC-24TiB2 Materials up to 750°C in Air Ostfildern Techn. Akad. Esslingen 2004 Tribology and lubrication engineering - 14th International Colloquium Tribology II 3-924813-54-X 14th International Colloquium Tribology, Tribology and Lubrication Engineering Stuttgart, Deutschland 2004-01-13 2004-01-15 1039 1045 2016-02-19 OPUS4-3058 Beitrag zu einem Sammelband Klaffke, Dieter; Wäsche, Rolf; Wötting, G. Bartz, Wilfried J. Tribological Characterisation of a Sl3N4-TiN Composite Ceramic in Fretting Tests at Room Temperature Ostfildern Techn. Akad. Esslingen 2004 Tribology and lubrication engineering - 14th International Colloquium Tribology III 3-924813-54-X 14th International Colloquium Tribology, Tribology and Lubrication Engineering Stuttgart, Germany 2004-01-13 2004-01-15 1413 1420 2016-02-19 OPUS4-3059 Beitrag zu einem Sammelband Klaffke, Dieter; Wäsche, Rolf; Aldinger, F.; Janakiraman, N. Bartz, Wilfried J. Tribological investigations on siliconcarbonitride ceramics derived from preceramic polymers Ostfildern Techn. Akad. Esslingen 2004 Tribology and lubrication engineering - 14th International Colloquium Tribology 3 3-924813-54-X 14th International Colloquium Tribology, Tribology and Lubrication Engineering Stuttgart, Deutschland 2004-01-13 2004-01-15 1403 1412 2016-02-19 OPUS4-3132 Zeitschriftenartikel Wäsche, Rolf; Klaffke, Dieter; Yarim, Rasim; Santner, Erich Tribological Tayloring of Ceramic Composites With respect to their excellent material properties ceramics are of interest as candidate materials for tribological applications. The friction and wear behaviour of ceramics is often superior to that of metallic materials. Furthermore, an essential improvement of tribological performance will be possible by tailoring of ceramics in the process of powder preparation and sintering technique. Silicon Carbide (SiC) shows interesting friction and wear behaviour at room temperature, even under unlubricated running conditions but is very sensitive against effects of environmental humidity and shows high friction and high wear in the absence of water vapour. The tribological performance of SiC can be improved considerably by adding substantial amounts of TiC and TiB2 to the microstructure thus creating ceramic particulate composite materials. Various composites in the quasi ternary system SiC-TiC-TiB2 were prepared by a ceramic manufacturing process including sintering temperatures up to 2180 °C. Comparative tribo tests were performed under unlubricated oscillating sliding motion in dry, normal, and moist air and under water lubrication with SiC balls and Al2O3 balls as counter bodies. The friction is affected by the relative humidity (RH) but barely at all by the composition of the composites. The wear resistance of the composites was found to be improved considerably by addition of TiB2 in the range from 20 to 60 %. The highest wear resistance of the system wear was found when Al2O3 was used as counter body material. Weinheim Wiley-VCH Verl. 2003 Materialwissenschaft und Werkstofftechnik = Materials science and engineering technology 34 10/11 1008 1013 10.1002/mawe.200300688 2016-02-19 OPUS4-3076 Vortrag Wäsche, Rolf Oscillating Sliding Wear Behaviour of SiC, TiC, TiB2, 59SiC-41TiB2 and 52SiC-24TiC-24TiB2 Materials up to 750°C in Air 2004 14th International Colloquium Tribology, Tribology and Lubrication Engineering 14th International Colloquium Tribology, Tribology and Lubrication Engineering Ostfildern, Germany 2004-01-13 2004-01-15 2016-02-19 OPUS4-761 Zeitschriftenartikel Wäsche, Rolf; Klaffke, Dieter High temperature tribological behaviour of particulate composites in the system SiC-TiC-TiB2 during dry oscillating sliding Seoul Han'guk-Seramik-Hakhoe 1999 The Korean journal of ceramics 5 2 155 161 2016-02-19 OPUS4-1172 Beitrag zu einem Sammelband Klaffke, Dieter; Wäsche, Rolf Franek, F. Friction and wear behaviour of ceramic SiC-TiC-TiB2 composites under unlubricated oscillating sliding conditions Wien ÖTG Österreichische Tribologische Gesellschaft 2001 Tribology 2001 3-901657-07-X 2nd World Tribology Congress ; 2nd WTC 2001 Vienna, Austria 2001-09-03 2001-09-07 140 2016-02-19 OPUS4-2080 Zeitschriftenartikel Hackley, V.A.; Patton, J.; Lum, L.-S. H.; Wäsche, Rolf; Naito, M.; Abe, H.; Hotta, Y.; Pendse, H. Analysis of the isoelectric point in moderately concentrated Alumina suspensions using electroacoustic and streaming potential methods New York, NY Dekker 2002 Journal of dispersion science and technology 23 5 601 617 2016-02-19 OPUS4-723 Beitrag zu einem Sammelband Klaffke, Dieter; Wäsche, Rolf Schulte, K.; Kainer, K. Tribologische Prüfungen als begleitende Maßnahme zur Entwicklung von keramischen Tribowerkstoffen Weinheim Wiley-VCH Deutsche Gesellschaft für Materialkunde 1999 Verbundwerkstoffe und Werkstoffverbunde 1999 3-527-29967-X 12. Tagung "Verbundwerkstoffe und Werkstoffverbunde" Hamburg, Deutschland 1999-10-05 1999-10-07 423 428 2016-02-19 OPUS4-1152 Beitrag zu einem Sammelband Klaffke, Dieter; Wäsche, Rolf Friction and wear testing can steer the development of ceramic tribo materials Vienna ÖTG Österreichische Tribologische Gesellschaft 2001 Abstracts, papers, posters of the WTC 2001 3-901657-09-6 2nd World Tribology Congress ; 2nd WTC 2001 Vienna, Austria 2001-09-03 2001-09-07 141 2016-02-19 OPUS4-1386 Beitrag zu einem Tagungsband Klaffke, Dieter; Wäsche, Rolf Tribological Performance of SiC and TiB2 sliding against SiC and Al2O3 Stockholm Royal Institute of Technology Kungliga Tekniska Högskolan, Stockholm 2002 Keynotes and abstracts of Nordtrib 2002 10th Nordic Symposium on Tribology ; 10th Nordtrib 2002 Stockholm, Sweden 2002-06-09 2002-06-12 1(?) 10(?) 2016-02-19 OPUS4-1387 Beitrag zu einem Tagungsband Klaffke, Dieter; Yarim, Rasim; Wäsche, Rolf Effect of pre-oxidation on friction and wear behaviour of a SiC-TiC-TiB2 composite Stockholm Royal Institute of Technology Kungliga Tekniska Högskolan, Stockholm 2002 Keynotes and abstracts of Nordtrib 2002 10th Nordic Symposium on Tribology ; 10th Nordtrib 2002 Stockholm, Sweden 2002-06-09 2002-06-12 1 10(?) 2016-02-19 OPUS4-1428 Zeitschriftenartikel Wäsche, Rolf; Klaffke, Dieter; Czichos, Horst Wear behaviour of i-carbon coatings Amsterdam Elsevier 1992 Wear 153 149 162 2016-02-19 OPUS4-1429 Zeitschriftenartikel Wäsche, Rolf; Steinborn, Gabriele Influence of the Dispersants in Gelcasting of Nanosized TiN Oxford Elsevier European Ceramic Society 1997 Journal of the European Ceramic Society 17 421 426 2016-02-19 OPUS4-1430 Zeitschriftenartikel Wäsche, Rolf; Naito, M.; Hackley, V.A. Experimental study on zeta potential and streaming potential of advanced ceramic powders Zeta potential as measured with the electrokinetic sonic amplitude (ESA) method has been compared to streaming potential as measured with the particle charge detection (PCD) method. The measurements have been carried out on identical suspensions of a-Al2O3, SiC and Si3N4 with a solids volume fraction of 1% and 10%. Zeta potential and streaming potential are related by a linear function. The correlation coefficients for this relationship are better than 0.99 for the suspensions with 1% solids loading. For the suspensions with 10% solids loading, correlation coefficients are slightly lower due to the influence of increasing viscosity. Regardless of lower correlation at the higher solids loading, the isoelectric pH is constant within the limits of accuracy of the pH measurements. Amsterdam Elsevier 2002 Powder technology 123 275 281 10.1016/S0032-5910(01)00462-4 2016-02-19 OPUS4-1431 Zeitschriftenartikel Wäsche, Rolf Keramische Supraleiter - Kristallstruktur, Gefüge und Eigenschaften Berlin Bundesanstalt für Materialprüfung 1988 Amts- und Mitteilungsblatt der Bundesanstalt für Materialprüfung 18 2 128 133 2016-02-19 OPUS4-2406 Beitrag zu einem Sammelband Wäsche, Rolf; Klaffke, Dieter; Skopp, André Bartz, Wilfried J. Tribological behaviour of silicon nitride with boron nitride as a solid lubricant Ostfildern Techn. Akad. Esslingen 1992 Tribologie 2000 3-924813-28-0 8 10.2-1 - 10.2-10 2016-02-19 OPUS4-2408 Zeitschriftenartikel Woydt, Mathias; Skopp, André; Wäsche, Rolf Ceramic-ceramic composite materials with improved friction and wear properties Oxford Butterworth-Heinemann 1992 Tribology International 25 12 61 70 2016-02-19 OPUS4-2409 Beitrag zu einem Sammelband Woydt, Mathias; Skopp, André; Wäsche, Rolf Carlsson, R. Ceramic-ceramic composite materials with improved friction and wear properties London Elsevier Swedish Ceramic Society 1992 Proceedings of the 4th International Symposium on Ceramic Materials and Components for Engines 1-85166-776-8 4th International Symposium Ceramic Materials and Components for Engines Göteborg, Sweden 1991-01-01 1219 1239 2016-02-19 OPUS4-11062 Vortrag Wäsche, Rolf Oscicalling sliding wear behaviour of SiC, TiC, TiB2 59SiC-41TiB2 and 52SiC-24TiC-24TiB2 2004 14th International Colloquium Tribology 14th International Colloquium Tribology Ostfildern, Germany 2004-01-13 2004-01-15 2016-02-19 OPUS4-12051 Beitrag zu einem Tagungsband Wäsche, Rolf; Klaffke, Dieter; Woydt, Mathias; Dörfel, Ilona Interface formation by tribo-oxidation in SiC based ceramics BAM 2003 AIST-BAM Symposium on Materials Surface Technology in Twin Institute Programme AIST-BAM Symposium on Materials Surface Technology in Twin Institute Programme Tsukuba, Japan 2003-02-18 1 4 2016-02-19 OPUS4-12053 Zeitschriftenartikel Wäsche, Rolf; Klaffke, Dieter; Woydt, Mathias; Dörfel, Ilona Structure of the interface in SiC-based ceramic composites formed by tribo-oxidation under dry sliding conditions Westerville, Ohio American Ceramic Society 2004 Ceramic transactions 146 401 407 2016-02-19 OPUS4-12054 Zeitschriftenartikel Wäsche, Rolf; Yarim, Rasim; Nicolaides, Dagmar Influence of Green Compaction on the Sintering Behaviour of SiC-TiC-TiB2 Composites Aedermannsdorf Trans Tech Publ. 2004 Key engineering materials 264-268 213 218 2016-02-19 OPUS4-12057 Beitrag zu einem Tagungsband Yarim, Rasim; Wäsche, Rolf; Woydt, Mathias; Dörfel, Ilona Analysis of wear protecting oxide layers in the system SiC-TiC-TiB2 formed in-situ at high temperatures BAM 2003 AIST-BAM Symposium on Materials Surface Technology in Twin Institute Programme AIST-BAM Symposium on Materials Surface Technology in Twin Institute Programme Tsukuba, Japan 2003-02-18 5 8 2016-02-19 OPUS4-12302 Zeitschriftenartikel Klaffke, Dieter; Wäsche, Rolf; Janakiraman, N.; Aldinger, F. Tribological characterisation of siliconcarbonitride ceramics derived from preceramic polymers Amorphous SiCN ceramics were prepared in a laboratory scale as disk shaped specimens with 10 mm diameter and 0.3 mm thickness. The friction and wear behaviour was characterised in gross slip fretting tests under unlubricated conditions at room temperature against steel (100Cr6) and ceramic (Al2O3). Tests with a ball-on-disk contact were performed in laboratory air with different content of water vapour. The results show clearly that the relative humidity has a significant effect on friction and wear behaviour. All tests in dry air lead to higher friction and higher wear rate than in normal air. Improved friction and wear behaviour was observed with increasing pyrolysis temperature up to 1100 °C of the SiCN specimens. This is attributed to increasingly better mechanical properties and higher stiffness of the amorphous network due to the evaporation of gaseous organic species and the formation of free graphite like carbon. Amsterdam Elsevier 2006 Wear 260 7-8 711 719 10.1016/j.wear.2005.04.031 2016-02-19 OPUS4-4304 Vortrag Wäsche, Rolf Structure of interface in SiC - based composites formed by tribo-oxidation under dry sliding conditions 2003 International Conference on the Characterization and Control of Interfaces for High Quality Advanced Materials (ICCCI 2003) International Conference on the Characterization and Control of Interfaces for High Quality Advanced Materials (ICCCI 2003) Kurashiki, Japan 2003-09-24 2003-09-27 2016-02-19 OPUS4-4305 Vortrag Wäsche, Rolf Interface formation in SiC based composites 2003 AIST-BAM Symposium on Material Surface Technology in TWIN Institute Programme AIST-BAM Symposium on Material Surface Technology in TWIN Institute Programme Tsukuba, Japan 2003-02-18 2016-02-19 OPUS4-5354 Vortrag Wäsche, Rolf Gas pressure sintering of SiC-TiC-TiB2 ceramic composites 2003 8. ECerS Conference of the European Ceramic Society 8. ECerS Conference of the European Ceramic Society Istanbul, Turkey 2003-06-29 2003-07-03 2016-02-19 OPUS4-5361 Vortrag Wäsche, Rolf Laser induced thermal shock testing on Si3N4 GS44 and alumina Heratape 2003 Research and Development on Advanced Materials for Transportation Applications Research and Development on Advanced Materials for Transportation Applications Oakland, CA, USA 2003-10-22 2016-02-19 OPUS4-5362 Vortrag Wäsche, Rolf Werkstoffe der hochleistungskeramik - Herstellung und Charakterisierung an der BAM 2003 Seminar für Werkstofftechnik im FB 15 der Universität Kassel Seminar für Werkstofftechnik im FB 15 der Universität Kassel Kassel, Germany 2003-11-17 2016-02-19 OPUS4-7091 Zeitschriftenartikel Procop, Mathias; Hübner, Wolfgang; Wäsche, Rolf; Nieland, S.; Ehrmann, O. Fast Elemental Mapping in Materials Science Bookham, Surrey Rolston Gordon Comm. 2002 European microscopy and analysis January 5 6 2016-02-19 OPUS4-11828 Vortrag Wäsche, Rolf Dispersion and Characterisation of Nanoscale Particle Suspensions 2005 International Symposium on Smart Processing Technology (ISMPT) International Symposium on Smart Processing Technology (ISMPT) Osaka, Japan 2005-11-14 2005-11-14 2016-02-19 OPUS4-11057 Vortrag Wäsche, Rolf Tribological investigations on siliconcarbonitride ceramics derived from preceramic 2004 14th International Colloquium Tribology 14th International Colloquium Tribology Ostfildern, Germany 2004-01-13 2004-01-15 2016-02-19 OPUS4-26003 Zeitschriftenartikel Hartelt, Manfred; Wäsche, Rolf Verschleißuntersuchungen an Dental-Implantat-Werkstoffen unter partial slip Bedingungen Renningen Expert Verlag Gesellschaft für Tribologie 2012 Tribologie und Schmierungstechnik 59 3 18 23 2016-02-19 OPUS4-26014 Vortrag Wäsche, Rolf Wear behaviour of yttrium titanate ceramics under gross slip fretting conditions 2012 Int. Conf. Nordic Countries (NordTrib 2012) Int. Conf. Nordic Countries (NordTrib 2012) Trondheim, Norway 2012-06-12 2012-06-15 2016-02-19 OPUS4-24497 Zeitschriftenartikel Podgursky, V.; Adoberg, E.; Surzenkov, A.; Kimmari, E.; Viljus, M.; Mikli, V.; Hartelt, Manfred; Wäsche, Rolf; Síma, M.; Kulu, P. Dependence of the friction coefficient on roughness parameters during early stage fretting of (Al,Ti)N coated surfaces Main focus was on the correlation of the coefficient of friction (COF) with the geometrical parameters of the surface during early stage of the running-in period. TiN, TiAlN and AlTiN coatings were prepared by using rotating cathode arc evaporation unit. The roughness of the WC-Co substrate Ra ranged from 0.05 to 0.2 µm and the coating thickness was 2.3 ± 0.2 µm. Part of the samples were subjected to the surface modification by the drag grinding finishing. Geometrical parameters of the surface were evaluated by means of atomic force microscopy (AFM) and fretting tests were conducted with 10 mm diameter alumina ball under 2 N load, 100 µm slip distance and the frequency of 10 Hz. It was found that the distribution of macroparticles strongly influences the geometrical parameters of the surface and the number of macroparticles increases with increasing Al content in the coating. In the case of the positive skewness Ssq of the coating surface, the kurtosis Sku provides a statistically significant effect on the COF, namely the COF depends inversely on the kurtosis Sku. The kurtosis value for TiN was the highest among as-deposited coatings, subsequently, the slowest increase rate in the COF was observed for the TiN coating. Amsterdam Elsevier 2011 Wear 271 5-6 853 858 10.1016/j.wear.2011.03.006 2016-02-19 OPUS4-24609 Vortrag Wäsche, Rolf Oxidative wear in gross slip fretting of thin steel wires 2011 ITC Hiroshima Satellite Symposium, Tribochemistry Hagi 2011 ITC Hiroshima Satellite Symposium, Tribochemistry Hagi 2011 Hagi, Japan 2011-10-25 2011-10-28 2016-02-19 OPUS4-24610 Vortrag Wäsche, Rolf The history of the Stribeck curve and the role of Adolf Martens 2011 Int. Tribology Congress / ITC Hiroshima Int. Tribology Congress / ITC Hiroshima Hiroshima, Japan 2011-10-30 2011-11-03 2016-02-19 OPUS4-24612 Vortrag Wäsche, Rolf Alumina and zirconia as tribomaterials - a review 2012 The Fourth International Conference on The Characterization and Control of Interfaces for High Quality Advanced Materials (ICCCI 2012) The Fourth International Conference on The Characterization and Control of Interfaces for High Quality Advanced Materials (ICCCI 2012) Kurashiki, Japan 2012-09-02 2012-09-05 2016-02-19 OPUS4-25343 Vortrag Wäsche, Rolf Tribological behaviour of polyurethane under oscillating sliding conditions against cast iron 2012 18. Int. Colloq. Tribology - Industrial and Automotive Lubrication 18. Int. Colloq. Tribology - Industrial and Automotive Lubrication Ostfildern, Germany 2012-01-10 2012-01-12 2016-02-19 OPUS4-24813 Beitrag zu einem Tagungsband Hartelt, Manfred; Wäsche, Rolf Verschleißuntersuchungen an Dental-Implantat-Werkstoffen unter partial slip Bedingungen Im Vortrag wird neben der apparativen Prüftechnik das allgemeine methodische Vorgehen für Modell-Verschleißuntersuchungen im Bereich des partial slip vorgestellt. Im Detail wird für Dental-Implantat-Werkstoffe eine Rangfolge aufgestellt, die vergleichend die Verschleißresistenz unterschiedlicher Ti-basierter Werkstoffe zeigt. Wird durch die Kaubewegung eine mehrachsige Beanspruchung in die Kontaktflächen der Schraubverbindung eingeleitet, kann durch partial slip im Randbereich dieser Kontaktfläche ein Verschleißprozess initiiert werden, der die Lockerung des Implantats begünstigt. Eine gute Verschleißresistenz verhindert oder schiebt die vorzeitige Lockerung hinaus. Um das Werkstoffverhalten in Bezug auf eine vorzeitige Lockerung der Implantatkrone bei geschraubten zweiteiligen Implantaten zu charakterisieren, wurden zylindrische Probekörper unter partial slip Fretting-Bedingungen mit Zyklenzahlen bis n = 200 000 beansprucht. Die Frequenz der aufgebrachten Tangentialkraft betrug 2 Hz, um die Kaubewegung zu simulieren. Die tribologischen Untersuchungen wurden auf einem Eigenbau-Tribometer mit der Kontaktgeometrie „gekreuzte Zylinder" durchgeführt. Die zylindrischen Proben wurden aus den Werkstoffen Titan Grade 4 und der Ti-Legierung Ti6AI4V gefertigt. Ein Teil dieser Ti-basierten Proben wurde oberflächengehärtet. Die bisher erzielten Ergebnisse zeigen, dass die oberflächenbehandelten Proben dazu neigen, unter der Belastung die Kontaktfläche zu vergrößern. Dies deutet auf einen Effekt bekannt als „junction growth" und damit auf eine erhöhte Versetzungsbeweglichkeit der randschichtgehärteten Proben hin. Einen Einfluss der Zwischenstoffe konnte nicht nachgewiesen werden. Gesellschaft für Tribologie e.V. 2011 52. Tribologie-Fachtagung - Reibung, Schmierung und Verschleiß - Forschung und praktische Anwendungen I 978-3-00-035439-7 52. Tribologie-Fachtagung - Reibung, Schmierung und Verschleiß - Forschung und praktische Anwendungen Göttingen, Germany 26.09.2011 28.09.2011 14/1 14/11 2016-02-19 OPUS4-5219 Zeitschriftenartikel Steinborn, Gabriele; Fritz, Ulrich; Rabe, Torsten; Wäsche, Rolf Dispergierung von Nanopulvern in Foliengießschlickern Baden-Baden Göller Deutsche Keramische Gesellschaft 2004 Ceramic Forum International : cfi 18 1 43 50 2016-02-19 OPUS4-6312 Vortrag Wäsche, Rolf Tribological Tailoring of Ceramic Composites 2002 13th International Colloquium on Tribology 13th International Colloquium on Tribology Esslingen am Neckar, Germany 2002-01-15 2002-01-17 2016-02-19 OPUS4-6313 Vortrag Wäsche, Rolf High Temperature Tribological Behaviour of SiC Particulate Composites 2002 Austceram 2002 Austceram 2002 Perth, Australia 2002-09-30 2016-02-19 OPUS4-6303 Vortrag Wäsche, Rolf Bestimmung der Thermoshockfestigkeit von Keramik mittels Laseraufzeichung 2002 DKG Bezirksgruppensutzung Berlin DKG Bezirksgruppensutzung Berlin Berlin, Germany 2002-04-18 2016-02-19 OPUS4-6304 Vortrag Wäsche, Rolf Pre- Standardisation for Powders and Green Bodies - VAMAS TWA 27 as a Tool for enhancement of Quality in the Ceramic Manufacturing Process 2002 International Workshop on Trends and Initiatives in Materials Characterisation and Processing International Workshop on Trends and Initiatives in Materials Characterisation and Processing Gwangju, South Korea 2002-09-02 2016-02-19 OPUS4-6305 Vortrag Wäsche, Rolf Tribology of Advanced Ceramics III: Principles of solid lubrication - materials and mechanisms 2002 APEC workshop APEC workshop Daejeon, South Korea 2002-03-04 2016-02-19 OPUS4-6306 Vortrag Wäsche, Rolf Tribology of Advanced Ceramics I: Mild to severe wear transitions 2002 APEC workshop APEC workshop Daejeon, South Korea 2002-03-04 2016-02-19 OPUS4-6307 Vortrag Wäsche, Rolf Tribological perfomance of SiC and TiB2 SSilding against SiC and AI2O3 2002 NORDTRIB 2002 NORDTRIB 2002 Stockholm, Sweden 2002-06-10 2002-06-12 2016-02-19 OPUS4-6308 Vortrag Wäsche, Rolf Tribology of Advanced Ceramics II: Evaluation of tribological Properties 2002 APEC workshop APEC workshop Daejeon, South Korea 2002-03-04 2016-02-19 OPUS4-6309 Vortrag Wäsche, Rolf Porous alumina from nano sized powders with improwed diffuse reflection properties 2002 Vorlesung bei Osaka University Vorlesung bei Osaka University Osaka, Japan 2002-09-04 2016-02-19 OPUS4-6310 Vortrag Wäsche, Rolf Promoting the infrastructure - prestandardisation endeavours for ceramic powders and green bodies 2002 Annual Meeting of the American Ceramic Society Annual Meeting of the American Ceramic Society St. Louis, MO, USA 2002-04-30 2016-02-19 OPUS4-14972 Beitrag zu einem Tagungsband Kloß, Heinz; Wäsche, Rolf Analytical approach for wear prediction of metallic and ceramic materials in tribological applications Ljubljana Slovenská Akadémia Vied 2007 Proceedings of ECOTRIB 2007 I ECOTRIB 2007 Ljubljana, Slovenia 2007-06-12 2007-06-15 223 234 2016-02-19 OPUS4-15921 Beitrag zu einem Tagungsband Wäsche, Rolf; Hartelt, Manfred; Springborn, U.; Köster, K.; Bewilogua, K. Schwingungsverschleiß von Kohlenstoffnitridschichten CNx gegen Aluminiumoxid in Luft Aachen Gesellschaft für Tribologie e.V. (GfT) 2007 48. Tribologie-Fachtagung "Reibung, Schmierung und Verschleiß - Forschung und praktische Anwendungen", 24.- 26.9.2007, Göttingen 978-3-00-022603-8 48. Tribologie-Fachtagung Göttingen, Deutschland 2007-09-24 2007-09-26 27/1 27/11 2016-02-19 OPUS4-16677 Zeitschriftenartikel Urchegui, M.A.; Hartelt, Manfred; Wäsche, Rolf; Gómez, X. Analysis of different strategies to reduce fretting wear in thin steel roping wires After having checked in a previous study the influence of stroke and normal load in laboratory fretting tests accomplished with thin steel roping wires, in this paper the effect of the contact pressure (test configuration), environmental conditions (relative humidity) and reduction of the friction coefficient (lubricants) on the wear behaviour were analysed. The wires were 0.45 mm in diameter and the material was a cold-drawn eutectoid carbon steel (0.8% C) with a Tensile Strength over 2800 MPa. The tests were performed on an oscillating test rig and the volumetric wear of both specimens of the tribocouple was determined separately from three-dimensional topographies of the wear scars acquired by means of a confocal profiler, and a calculation algorithm developed in using MATLAB®. The strong effect of humidity and lubrication on wear behaviour was proved, whereas a slight effect of contact pressure was derived. Deal Coppin 2008 TriboTest 14 1 43 57 10.1002/tt.52 2016-02-19 OPUS4-18316 Vortrag Wäsche, Rolf Physikalisch-chemische Grundlagen der Festschmierstoffe 2008 TAE Esslingen: Lehrgang: Reibungs- und Verschleißminderung durch Festschmierstoffe TAE Esslingen: Lehrgang: Reibungs- und Verschleißminderung durch Festschmierstoffe Ostfildern, Germany 2008-03-31 2008-04-02 2016-02-19 OPUS4-18317 Vortrag Wäsche, Rolf Grundlagen der Schwingungsverschleißprüfung 2008 TAE Esslingen + GfT: Seminar: Reibung und Verschleiß von Werkstoffen, Bauteilen und Konstruktion TAE Esslingen + GfT: Seminar: Reibung und Verschleiß von Werkstoffen, Bauteilen und Konstruktion Ostfildern, Germany 2008-04-08 2008-04-09 2016-02-19 OPUS4-18318 Vortrag Wäsche, Rolf Verschleißprüfung als Werkzeug für die keramikbezogene Werkstoffentwicklung 2008 Hannover-Messe 2008: Werkstoff-Forum Hannover-Messe 2008: Werkstoff-Forum Hanover, Germany 2008-04-25 2016-02-19 OPUS4-16102 Beitrag zu einem Tagungsband Hartelt, Manfred; Wäsche, Rolf; Djahanbakhsh, Mohammad; Österle, Werner Vergleich von Standard-Modell- und HIP-Simulator-Untersuchungen an Verschleißschutzschichten für Metall-Keramik-Paarungen bei Endoprothesen Aachen Gesellschaft für Tribologie e.V. (GfT) 2007 48. Tribologie-Fachtagung "Reibung, Schmierung und Verschleiß - Forschung und praktische Anwendungen", 24.- 26.9.2007, Göttingen 1 978-3-00-022603-8 48. Tribologie-Fachtagung "Reibung, Schmierung und Verschleiß - Forschung und praktische Anwendungen" Göttingen, Deutschland 2007-09-24 2007-09-26 8/1 8/10 2016-02-19 OPUS4-18439 Zeitschriftenartikel Österle, Werner; Djahanbakhsh, Mohammad; Hartelt, Manfred; Wäsche, Rolf Reasons for inferior performance of ceramic on a-C:H-coated Ti-6Al-4V in hip simulator testing compared to ball on flat reciprocating sliding tests The tribological performance of a hydrogenated amorphous carbon coating on Ti–6Al–4V against ceramic balls was checked by simple reciprocating sliding tests and by more complicated tests in a hip joint simulator. 3 of 4 joints failed during hip simulator testing already after approximately 100 × 10³ cycles and possibly due to coating failures caused by insufficient polishing of the metallic acetabular cups prior to coating deposition. Since such failures occurred only occasionally, the problem was not revealed by reciprocating sliding tests which are stressing a much smaller surface area compared to the tests in the hip joint simulator. Another type of failure, pits of 1–2 µm in diameter distributed randomly at the coating surface, was frequently observed by Scanning Electron Microscopy and analyzed comprehensively by Focused Ion Beam technique in combination with Transmission Electron Microscopy in one case. Although not necessarily affecting wear, such small failures might cause long-term problems in vivo, by providing access of body fluid to the substrate–coating interface making it susceptible to corrosion. Amsterdam Elsevier 2008 Wear 265 11-12 1727 1733 10.1016/j.wear.2008.04.008 2016-02-19 OPUS4-15737 Zeitschriftenartikel Wäsche, Rolf; Gräber, H.-G.; Klaffke, Dieter Tribologische Untersuchung zum Verschleißverhalten von keramischen Zahnersatzwerkstoffen Renningen Expert Verlag Gesellschaft für Tribologie 2007 Tribologie und Schmierungstechnik 54 3 29 32 2016-02-19 OPUS4-16271 Zeitschriftenartikel Steinborn, Gabriele; Wäsche, Rolf Charakterisierung der Dispergiereigenschaften von keramischen nanodispersen Suspensionen mit der Ultraschallspektroskopie Die Dispergiereigenschaften von verschiedenen nanoskaligen Pulvern mit unterschiedlicher Kornfraktion im Bereich von 10 bis 250 nm werden in verdünnten und konzentrierten keramischen Schlickern mit der Ultraschallspektroskopie untersucht. Alle stabilen Suspensionen weisen im entsprechenden pH-Bereich eine monomodale Partikelgrößenverteilung auf. Durch die Charakterisierung der Suspensionen mit der Ultraschallspektroskopie kann eine verbesserte Bewertung hinsichtlich Homogenität und Agglomeratbildung auch für nanoskalige Pulver erhalten werden. Dies ermöglicht eine bessere Qualitätskontrolle prozessrelevanter Schritte bei der Verarbeitung. Weinheim Wiley-VCH Verl. Verein Deutscher Ingenieure 2007 Chemie - Ingenieur - Technik 79 3 257 265 10.1002/cite.200600141 2016-02-19 OPUS4-16272 Buchkapitel Steinborn, Gabriele; Fritz, Ulrich; Rabe, Torsten; Wäsche, Rolf Kriegesmann, J. Dispergierung von Nanopulvern in Foliengießschlickern Köln Deutscher Wirtschaftsdienst Deutsche Keramische Gesellschaft 2005 Technische keramische Werkstoffe - 89. Erg.-Lfg. 3-87156-091-X Kap. 3.3.3.5 1 16 2016-02-19 OPUS4-18463 Vortrag Wäsche, Rolf Tribological characterisation with crossed cylinders - comparison of methods and application examples 2008 TAE Esslingen: 16. International Colloquium Tribology 2008 TAE Esslingen: 16. International Colloquium Tribology 2008 Ostfildern, Germany 2008-01-15 2008-01-17 2016-02-19 OPUS4-18464 Vortrag Wäsche, Rolf The interface as key to unclustard ceramic tribology 2008 SRV Workshop und Normungstagung SRV Workshop und Normungstagung Nagoya, Japan 2008-03-11 2008-03-17 2016-02-19 OPUS4-16426 Beitrag zu einem Sammelband Wäsche, Rolf Pohl, M. Schwingungsverschleißprüfung als Werkzeug für die Werkstoffentwicklung Düsseldorf Verl. Stahleisen Deutsche Gesellschaft für Materialkunde 2007 Konstruktion, Qualitätssicherung und Schadensanalyse 978-3-514-00753-6 Tagung "Werkstoffprüfung 2007" Neu-Ulm, Deutschland 2007-11-29 2007-11-30 299 304 2016-02-19 OPUS4-17133 Zeitschriftenartikel Hartelt, Manfred; Wäsche, Rolf; Djahanbakhsh, Mohammad; Österle, Werner Vergleich von Standard-Modell- und HIP-Simulator-Untersuchungen an Verschleißschutzschichten für Metall-Keramik-Paarungen bei Endoprothesen Renningen Expert Verlag Gesellschaft für Tribologie 2008 Tribologie und Schmierungstechnik 55 1 21 25 2016-02-19 OPUS4-18215 Vortrag Wäsche, Rolf Tribotesting with small loads and amplitudes - how does it compare to normal conditions in oscillating sliding? 2008 27th Meeting of the International Research Group on Wear of Engineering Materials 27th Meeting of the International Research Group on Wear of Engineering Materials Berlin, Germany 2008-09-30 2008-10-01 2016-02-19 OPUS4-18217 Vortrag Wäsche, Rolf Tribological behavior of hard carbon coatings sliding against aluminum oxide, silicon nitride and steel up to 250 °C in air 2008 NORDTRIB 2008, 13th Nordic Symposium on Tribology NORDTRIB 2008, 13th Nordic Symposium on Tribology Tampere, Finland 2008-06-10 2008-06-13 2016-02-19 OPUS4-12165 Beitrag zu einem Tagungsband Wäsche, Rolf; Klaffke, Dieter; Steinborn, Gabriele Bartz, Wilfried J. Tribological investigations on infiltrated zirconia Ostfildern Technische Akademie Esslingen (TAE) 2006 15th International colloquium tribology - Automotive and industrial lubrication 3-924813-62-0 15th International colloquium tribology - Automotive and Industrial Lubrication Ostfildern, Germany 2006-01-17 2006-01-19 1(?) 7(?) 2016-02-19 OPUS4-12167 Beitrag zu einem Tagungsband Klaffke, Dieter; Wäsche, Rolf Bartz, Wilfried J. Tribological Characterisation of ceramics in fretting tests at room temperature Ostfildern Technische Akademie Esslingen (TAE) 2006 15th International colloquium tribology - Automotive and industrial lubrication 3-924813-62-0 15th International colloquium tribology - Automotive and Industrial Lubrication Ostfildern, Germany 2006-01-17 2006-01-19 1(?) 10(?) 2016-02-19 OPUS4-12365 Zeitschriftenartikel Wäsche, Rolf; Klaffke, Dieter; Steinborn, Gabriele Tribological testing of Ca-Ba infiltrated zirconia Gala¸ti Universitatea Dunarea de Jos 2005 Analele Universita¸tii Dunarea de Jos din Gala¸ti = The annals of Dunarea de Jos University of Gala¸ti 53 59 2016-02-19 OPUS4-18571 Beitrag zu einem Sammelband Wäsche, Rolf; Klaffke, Dieter Christophe Donnet, ; Erdemir, Ali Tribology of DLC Films Under Fretting Conditions Springer Science + Business Media 2008 Tribology of Diamond-Like Carbon Films - Fundamentals and Applications 978-0-387-30264-5 362 382 2016-02-19 OPUS4-28979 Zeitschriftenartikel Kovalev, Alexander; Hartelt, Manfred; Spaltmann, Dirk; Wäsche, Rolf; Woydt, Mathias Zero wear (Null Verschleiß) Renningen Expert Verlag Gesellschaft für Tribologie 2013 Tribologie und Schmierungstechnik 60 2 5 12 2016-02-20 OPUS4-29091 Beitrag zu einem Tagungsband Scholz, Christian; Wäsche, Rolf Stick-slip and wear behavior of ceramic and polymer materials under reciprocating sliding conditions In many technical applications not only the actual friction coefficient is of importance, but rather the constancy relevant for the functionality. Due to inconstant ffiction values, positioning processes can be substantially influenced as well as vibrations can be induced. The appearance of this tribological effect, named stick-slip, depends on different factors such as sliding speed, relative humidity and ambient temperature occurring primarily after long operating periods. Beside ambient conditions the choice of materials in contact is the main influencing factor of an inconstant coefficient of friction during operating. Certain polymers are well known for their stick-slip tendencies in technical applications. These are on the one hand different modifications of PTFE (polytetrafluoroethylene) reinforced with glass fibers, bronze or graphite and on the other hand thermoplastics such as PE (polyester) or Pf (polyimide). The difference between static and dynamic values of the ffiction force is decisive for stick-slip phenomena. Furthermore, the stick-slip tendency of polymers strongly depends on the elastic material properties. Main softening material areas, which can be found in the contact, represent particularly vulnerable areas. The high friction value in the contact area decreases in most cases by increasing sliding speeds. However, beside polymers ceramic materials can also offer tendencies to stick-slip motion. Klaffke et al. already investigated the influence of ceramic materials on the stick-slip behavior in. Associazione Italiana di Tribologia 2013 WTC 2013 - 5th World tribology congress WTC 2013 - 5th World tribology congress Torino, Italy 08.09.2013 13.09.2013 1 4 2016-02-20 OPUS4-29640 Beitrag zu einem Tagungsband Hartelt, Manfred; Cappella, Brunero; Wäsche, Rolf Verschleißbestimmung im nm-Bereich Die Verschleißbeträge können im nm-Bereich quantifiziert werden durch die Berechnung eines Mittelwert-Profils. Grundlage dieser Berechnung ist die hochauflösende Erfassung der 3D-Topographiedaten, die tribologisch beanspruchte und nichtbeanspruchte Oberflächenbereiche gleichermaßen beinhalten. Ein bestimmtes Messverfahren (taktil oder optisch) wird nicht favorisiert. Die vertikale Auflösung des Messverfahrens sollte im nm-Bereich liegen.--------------------------------------------------------------------------------------------------------------------------------------------------------------------- The wear rates can be quantified in the nm range by calculating a mean profile. Based on this calculation is the high-resolution recording of the 3D topography data containing tribologically worn and unworn surface areas alike. A specific measurement method (tactile or visual) is not favored. The vertical resolution of the measurement process should be in the nm range. Gesellschaft für Tribologie e.V. (GfT) 2013 54. Tribologie-Fachtagung - Reibung, Schmierung und Verschleiß - Forschung und praktische Anwendungen I 978-3-00-022603-8 54. Tribologie-Fachtagung - Reibung, Schmierung und Verschleiß - Forschung und praktische Anwendungen Göttingen, Germany 2013-09-30 2013-10-02 31/1 31/10 2016-02-20 OPUS4-21842 Beitrag zu einem Sammelband Wäsche, Rolf; Woydt, Mathias; Rehmer, Birgit Ewsuk, K.; Naito, M.; Kakeshita, T.; Kirihara, S.; Uematsu, K.; Abe, H. Characterization of the tribological interface in low wear Magneli type ceramics The tribological behaviour under dry sliding conditions of Magneli phase Ti4O7 and e-phase Ti2Cr2O7 with α-alumina as a sliding partner has been characterised at room temperature by oscillating sliding. The mechanical properties as well as Vickers hardness measurements do not reveal big differences between the materials, and 4-point bending strengths are around 200 MPa for both materials. Although the friction coefficients are in the medium range of 0.6 and do not differ much between the materials, the wear behaviour is very different. At room temperature, the wear coefficient of Ti2O7 is strongly dependent on relative humidity, and wear is highest under dry conditions when relative humidity is low as it is typically found for many ceramic materials. Ti2Cr2O7 shows remarkably different wear behaviour with the lowest wear in dry conditions. The measured coefficients of wear at low relative humidity of 4% are more than 2 orders of magnitude lower than those for Ti2O7. Hoboken, New Jersey, USA John Wiley & Sons The American Ceramic Society 2009 3rd International conference on characterization and control of interfaces for high quality advanced materials III (Proceedings) / Ceramic Transactions 219 978-0-470-90917-1 3rd International conference on characterization and control of interfaces for high quality advanced materials Kurashiki, Japan 2009-09-06 2009-09-09 111 116 2016-02-19 OPUS4-21180 Zeitschriftenartikel Woydt, Mathias; Wäsche, Rolf The history of the Stribeck curve and ball bearing steels: The role of Adolf Martens The historical development on the discoveries of lubrication regimes for lubricated sliding contacts has been reviewed from the very beginning. It was found that the functional relationship between the coefficient of friction and the product of sliding speed and viscosity divided by the normal load well known as the Stribeck curve has been experimentally explored much earlier by Adolf Martens in 1888 long before Richard Stribeck did his pioneering measurements in 1902. However, basic work in this field of experimental hydrodynamics was done and results were published even earlier than that back in 1854 by Gustave A. Hirn, in 1879 by Robert H. Thurston and in 1883 by Beauchamp Tower. Amsterdam Elsevier 2010 Wear 268 11-12 1542 1546 10.1016/j.wear.2010.02.015 2016-02-19 OPUS4-21181 Zeitschriftenartikel Cruzado, A.; Hartelt, Manfred; Wäsche, Rolf; Urchegui, M.A.; Gómez, X. Fretting wear of thin steel wires. Part 1: Influence of contact pressure Different fretting tests of thin steel wires under different conditions (loads, strokes, number of cycles and mean pressures) were performed. The wires used had 0.45 mm in diameter and the material was a cold-drawn eutectoid carbon steel (0.8% C) with a tensile strength over 2800 MPa. The tests were carried out with 90° "crossed cylinders" configuration varying the stroke, normal load and testing time (number of cycles). Afterwards the volumetric wear was obtained using surface profilometry with diamond stylus. With a classical study of the coefficient of wear with respect to the sliding distance, the results show that the wear coefficient increases with normal load and stroke, consequently, for the same sliding distance, the wear produced was higher when the load and/or stroke is increased. In this work, the coefficient of wear is decreasing continuously as the test is running. In order to analyze better the wear behaviour, another method, in which the volumetric wear is compared with respect to the Archard's loading factor, is proposed. As result of this method, two distinctive behaviours were detected; one corresponds to the running-in period with a more aggressive wear behaviour and the second one to the stable steady state period. In all the tests the running-in period was similar with regard to the wear rates but in the stable period the wear rates were increasing with higher loads or strokes. Amsterdam Elsevier 2010 Wear 268 11-12 1409 1416 10.1016/j.wear.2010.02.017 2016-02-19 OPUS4-26640 Beitrag zu einem Tagungsband Kovalev, Alexander; Hartelt, Manfred; Spaltmann, Dirk; Wäsche, Rolf; Woydt, Mathias Zero wear (Null Verschleiß) Während des Gleitreibens auftretende, plastische Deformationen im oberen Bereich der Kontaktspitzen werden als „Null-Verschleiß" bezeichnet. Um diesen zu quantifizieren, werden in dieser Arbeit statt der üblichen, statistischen Rauheitsparameter die Flächen solcher Kontaktspitzenbefrachtet. Dabei liegen diesen Befrachtungen AFM-Bilder von realen Oberflächentopografien auf der Mikro-/Nanoskala als Ausgangspunkt für die Simulationen zugrunde. In den Simulationen wird berücksichtigt, dass die Flächen während der Gleitreibung in den Kontaktspitzen elastisch und plastisch verformt werden können. Ebenso wird der Effekt des Einsatzhärtens in die Befrachtungen eingeschlossen. Die Ergebnisse der Computersimulation stellen einen Weg zur Untersuchung der Reibkräfte zu Beginn des EinlaufVorgangs dar, insbesondere dann, wenn sich dabei die wahre Kontaktfläche verändert hat. Die Ergebnisse der Simulation belegen klar, dass das Vorliegen von „Null-Verschleiß" stark von der Veränderung der Oberfläche abhängt und nicht von der Erzeugung von Verschleißpartikel begleitet wird. Aachen Gesellschaft für Tribologie e.V. 2012 53. Tribologie-Fachtagung - Reibung, Schmierung und Verschleiß II 978-3-00-039201-6 53. Tribologie-Fachtagung - Reibung, Schmierung und Verschleiß Göttingen, Germany 24.09.2012 26.09.2012 43/1 43/13 2016-02-19 OPUS4-27272 Zeitschriftenartikel Kaltzakorta, O.; Wäsche, Rolf; Hartelt, Manfred; Aginagalde, A.; Tato, W. Influence of polymer filler on tribological properties of thermoplastic polyurethane under oscillating sliding conditions against cast iron The tribological behaviour of unfilled thermoplastic polyurethane (TPU) and a polymer sphere filled (TPUG) thermoplastic polyurethane have been studied under oscillating sliding condition against cast iron as a counterpart. In the case of unfilled TPU, the wear mechanisms are dominated by particle detachment and roll formation. In principle, TPUG also showed a similar wear mechanism as that of unfilled TPU; in addition, particle pull-out and delamination are also observed. Wear volume of TPUG was significantly higher than that for the unfilled TPU and this is attributed to the different material removal processes taking place in the material during sliding. The polymer spheres as a filler material deteriorated the wear resistance of TPU because of improper adhesion and bonding of filler in the TPU matrix and therefore it contributed to more wear. In case of TPU the friction behaviour was strongly dependant on the temperature and surface roughness of the counter body. The results showed that below the glass transition temperature higher friction values are observed with higher counter body surface roughness. However, above the glass transition temperature, higher friction values are observed with a smoother surface roughness of the counter body. In case of TPUG, the friction behaviour was not significantly dependent on surface roughness of the counter body. Dordrecht Springer Science Business Media B.V. 2012 Tribology letters 48 2 209 216 10.1007/s11249-012-0017-6 2016-02-20 OPUS4-27364 Vortrag Wäsche, Rolf Aiming at zero wear - Where are we right now? 2012 International Conference on Industrial Tribology (ICIT 2012) International Conference on Industrial Tribology (ICIT 2012) Pune, India 2012-12-07 2012-12-09 2016-02-20 OPUS4-30176 Beitrag zu einem Tagungsband Scholz, Christian; Wäsche, Rolf Bartz, Wilfried J. Effect of sliding speed and relative humidity on the tribological behaviour of ceramic and polymer materials Stuttgart/Ostfildern Technische Akademie Esslingen (TAE) 2014 19th International colloquium tribology - Industrial and automotive lubrication 978-3-943563-10-8 19th International colloquium Tribology - Industrial and automotive lubrication Stuttgart/Ostfildern, Germany 2014-01-21 2014-01-23 Paper 8.11, 1 6 2016-02-20 OPUS4-37014 Beitrag zu einem Tagungsband Wäsche, Rolf; Hartelt, Manfred; Ehrke, Roman Silva Gomes, J. F.; Meguid, S. A. A study on tribological behaviour of a-C:H coatings under lubricated conditions up to 250°C The influence of temperature and counterbody material on the tribological properties of a-C:H coatings deposited on Cronidur 30 steel has been investigated in a lubricated ball on disk contact situation with alpha-alumina and silicon nitride as counterbodies. The results show, that the wear volumes of the systems increase exponentially with increasing temperature, for alpha-alumina more than for silicon nitride. Two different wear mechanisms seem to have a major influence: First, the abrasive action due to materials hardness and second, the tribo-oxidation when silicon nitride is counter material. 2015 Proceedings of the 6th International Conference on Mechanics and Materials in Design 6th International Conference on Mechanics and Materials Design P. Delgada/Azores, Portugal 26.07.2015 30.07.2015 Paper 5395, 445 446 2016-08-01 OPUS4-30499 Beitrag zu einem Sammelband Wäsche, Rolf; Woydt, Mathias Mang, T. Stribeck curve The importance of lubricants in virtually all fields of the engineering industry is reflected by an increasing scientific research of the basic principles. Energy efficiency and material saving are just two core objectives of the employment of high-tech lubricants. The encyclopedia presents a comprehensive overview of the current state of knowledge in the realm of lubrication. All the aspects of fundamental data, underlying concepts and use cases, as well as theoretical research and last but not least terminology are covered in hundreds of essays and definitions, authored by experts in their respective fields, from industry and academic institutes. Heidelberg Springer 2014 Encyclopedia of lubricants and lubrication 4 978-3-642-22646-5 1998 2005 10.1007%2F978-3-642-22647-2 2016-02-20 OPUS4-30504 Zeitschriftenartikel Wäsche, Rolf; Steinborn, Gabriele Wear behaviour of low IR-emission titanate ceramics under gross slip fretting conditions against steel and alpha-alumina The tribological behavior of different low infrared (IR) emission ceramic materials from the titanate group has been investigated at room temperature under gross slip fretting conditions against 100Cr6 ball bearing steel and α-alumina as the counterface materials. For all material pairs, friction and wear depended largely on the relative humidity of the environment. When paired with steel the low IR-emission ceramic disks showed higher wear resistance. Under dry conditions, almost no wear was found on the low IR-emission ceramic specimen. The high wear on the steel counter body is caused not only by tribo-oxidation, which is the main wear mechanism, but also by abrasion. In dry conditions a COF of 0.6 and in humid conditions a COF of 0.2 have been measured. When paired with α-alumina the results on wear are just opposite to those with steel counterbody and the low IR-emission ceramic materials show much lower wear resistance under all conditions. This is explained by the predominance of abrasion and the relatively large difference in hardness between the low IR-emission ceramic and α-alumina. In high humidity environments the results point to the formation of stable reaction layers causing lower friction and wear. Amsterdam Elsevier B.V. 2014 Wear 315 1-2 11 16 10.1016/j.wear.2014.03.006 2016-02-20 OPUS4-31762 Zeitschriftenartikel Cruzado, A.; Hartelt, Manfred; Wäsche, Rolf; Urchegui, M.A.; Gómez, X. Fretting wear of thin steel wires. Part 2: Influence of crossing angle The wear behaviour of thin steel wires has been analyzed under oscillating sliding conditions in crossed cylinders contact geometry. The focus of this analysis was the influence of the crossing angle between the wires on the wear. The wires used had 0.45 mm in diameter and the material was cold-drawn eutectoid carbon steel (0.8% C) with a tensile strength higher than 2800 MPa. Two different types of tests were carried out, the first one representing the influence of the crossing angle for a constant load and the second one representing the influence of the crossing angle with constant contact pressure. In the first type of tests it was seen that as the contact angle decreases the contact pressure decreases too and hence less energy specific wear resistance is observed. As a consequence less wear is produced, thus increasing the life of the wires. In the second type of tests it was seen that with constant contact pressure but different crossing angles, nearly the same energy specific wear resistance was observed. This points at an identical wear behaviour in both type of tests but with a running-in and a steady state period as two different wear periods. The tests showed that the running in period may play an important role in the overall wear particle generation and hence the wear occurring in the steady state period is rather mild. Amsterdam Elsevier 2011 Wear 273 1 60 69 10.1016/j.wear.2011.04.012 2016-02-20 OPUS4-30497 Beitrag zu einem Sammelband Wäsche, Rolf; Hartelt, Manfred Mang, T. Fretting The importance of lubricants in virtually all fields of the engineering industry is reflected by an increasing scientific research of the basic principles. Energy efficiency and material saving are just two core objectives of the employment of high-tech lubricants. The encyclopedia presents a comprehensive overview of the current state of knowledge in the realm of lubrication. All the aspects of fundamental data, underlying concepts and use cases, as well as theoretical research and last but not least terminology are covered in hundreds of essays and definitions, authored by experts in their respective fields, from industry and academic institutes. Heidelberg Springer 2014 Encyclopedia of lubricants and lubrication 2 978-3-642-22646-5 680 687 10.1007/978-3-642-22647-2 2016-02-20 OPUS4-31528 Beitrag zu einem Tagungsband Hartelt, Manfred; Wäsche, Rolf; Hodoroaba, Vasile-Dan Verschleißpartikel-Analyse mit Rasterelektronenmikroskopie und energiedispersiver Röntgenspektrometrie im Transmissionsmodus (TSEM/EDX) Untersucht wurden Verschleißpartikel als elektronen-transparente Proben auf dünnen Trägerfolien mit einem hochauflösendem Rasterelektronenmikroskop und energiedispersiver Röntgenspektrometrie im Transmissionsmodus. Die hohe laterale Auflösung dieser modernen Methoden ermöglicht eine morphologische Charakterisierung der Verschleißpartikel bis in den nm-Bereich. Die hochauflösende Elementanalyse erlaubt eine Interpretation der Zusammensetzung und damit Rückschlüsse auf die Verschleißpartikelbildung. Die tribologischen Untersuchungen sind an einem Modell-Verschleißtribometer nach DIN 51834-2 geschmiert, aber ohne Ölkreislauf, durchgeführt worden. Die Präparation der Verschleißpartikel über eine Entnahme und Übertragung einer geringen Schmierstoffmenge mit einer Mikropipette auf eine TEM-Trägerfolie ist mit einem geringen Aufwand möglich. Der präparative Aufwand ist relativ gering. Das benötigte Schmierstoffvolumen beträgt wenige Mikroliter (0,001ml). Die Untersuchung zeigt die geringe geometrische Größe der Verschleißpartikel und bestätigt indirekt die These der Reaktionsschichtbildung mit einer geringen Schichtdicke, die ständig verschleißt und sich stetig neu bildet. Die beschriebenen Verschleißprozesse sind in der Modell-Verschleiß-Prüfung mit sehr hohen Pressungen am Versuchsbeginn nachweisbar. Gesellschaft für Tribologie e.V. (GfT) 2014 55. Tribologie-Fachtagung - Reibung, Schmierung und Verschleiß - Forschung und praktische Anwendungen I 978-3-00-046545-1 55. Tribologie-Fachtagung - Reibung, Schmierung und Verschleiß - Forschung und praktische Anwendungen Göttingen, Germany 22.09.2014 24.09.2014 05/1 05/10 2016-02-20 OPUS4-31581 Beitrag zu einem Tagungsband Tamura, T.; Nakase, Takuya; Hosohata, S.; Kato, S.; Woydt, Mathias; Wäsche, Rolf; Köhler, Norbert Zero wear and low friction under dry sliding In diesem Beitrag werden ungeschmierte Gleitpaarungen auf Basis von Oxidkeramik/DLC vorgestellt, bei denen die tribologischen Kenngrößen mehr oder weniger invariant von der Gleitgeschwindigkeit sind. Die DLC-Dünnschicht besteht aus einem bestimmten Verhältnis an sp2/sp3-hybridisiertem Kohlenstoff. Im Gegensatz zu artgleichen Gleitpaarungen aus MgO-.Zr02, AI2O3 oder SSiC mit Reibungszahlen oberhalb von 0,45, zeigt die Gleitpaarungen aus MgO-Zr02/DLC und alpha-A^OVDLC Festkörpergleitreibungszahlen zwischen 0,075 und 0,15, welche mit ansteigender Gleitgeschwindigkeit leicht abnahmen. Die Verschleißkoeffizienten der DLC-Dünnschichten lagen im Bereich von kleiner als 10~7 mm3/Nm bis herunter zu 10"9 mm3/Nm. Gesellschaft für Tribologie e.V. (GfT) 2014 55. Tribologie-Fachtagung - Reibung, Schmierung und Verschleiß - Forschung und praktische Anwendungen II 978-3-00-046545-1 55. Tribologie-Fachtagung - Reibung, Schmierung und Verschleiß - Forschung und praktische Anwendungen Göttingen, Germany 22.09.2014 24.09.2014 43/1 43/7 2016-02-20 OPUS4-31602 Beitrag zu einem Tagungsband Wäsche, Rolf; Hartelt, Manfred Wear testing with crossed cylinders - comparison of methods Three different contact geometries, ball on disk and two different settings with crossed cylinders have been investigated with regard to the agreement of the results of the tribological quantities determined by each method. The material combination was α-alumina as upper specimen and steel 100Cr6 as lower specimen. For each of the contact geometries 5 independent measurements were carried out and evaluated independently. The agreement between the single results of coefficient of friction and the coefficient of system wear as well as between the different groups and conditions are good. Largest scatter of the results were found in the dry air regime where both friction and wear depend strongly on the relative humidity. However, comparison of the absolute values of the coefficient of wear between the ball on disk contact geometry on one side and the 2 crossed cylinder contact geometries on the other side reveals a significant difference in that the ball on disk results are lower by about a factor of two. The results document also a high degree of repeatability of single wear tests. Technische Akademie Esslingen (TAE) 2008 16th International colloquium tribology - Lubricants, materials and lubrication engineering 16th International colloquium tribology - Lubricants, materials and lubrication engineering Stuttgart/Ostfildern, Germany 2008-01-15 2008-01-17 Paper 10_04_Wäsche, 1 6 2016-02-20 OPUS4-31743 Beitrag zu einem Tagungsband Scholz, Christian; Wäsche, Rolf Bartz, Wilfried J. Effect of sliding speed and relative humidity on the tribological behavior of ceramic and polymer materials Stuttgart/Ostfildern Technische Akademie Esslingen (TAE) 2014 19th International colloquium tribology - Industrial and automotive lubrication 978-3-943563-10-8 19th International colloquium Tribology - Industrial and automotive lubrication Stuttgart/Ostfildern, Germany 2014-01-21 2014-01-23 Paper 08_11_Scholz_Man, 1 6 2016-02-20 OPUS4-31751 Beitrag zu einem Tagungsband Wäsche, Rolf; Gräber, H.-G.; Klaffke, Dieter Experimentelle Untersuchungen zum Abriebverhalten von keramischen Werkstoffen für dentale Restaurationen Aachen Gesellschaft für Tribologie e.V. (GfT) 2006 47. Tribologie-Fachtagung - Reibung, Schmierung und Verschleiß - Forschung und praktische Anwendungen I 3-00-019670-6 47. Tribologie-Fachtagung - Reibung, Schmierung und Verschleiß - Forschung und praktische Anwendungen Göttingen, Germany 2006-09-25 2006-09-27 36/1 36/9 2016-02-20 OPUS4-31051 Vortrag Wäsche, Rolf Wear analysis on dental implant materials under partial slip conditions 2013 VII Iberian Conference on Tribology (IBERTRIB 2013) VII Iberian Conference on Tribology (IBERTRIB 2013) Oporto, Portugal 2013-06-20 2013-06-21 2016-02-20 OPUS4-19000 Zeitschriftenartikel Wäsche, Rolf; Klaffke, Dieter; Wötting, G. Tribological behaviour of structural Si-based ceramics in fretting tests at room temperature The friction and wear behaviour of SiC, Si3N4 and SiC/Si3N4 composite ceramics were investigated with oscillating sliding (gross slip fretting) at room temperature. The influence of counter body material and the humidity of the surrounding air was studied with a ball-on-disc configuration with different ball materials (1000Cr6, Al2O3 SiC and Si3N4). The effect of RH on friction is marginal with exception of SiC (low friction) as counter body material. The wear behaviour, however, is strongly affected by humidity, showing inverse trends for different counter body materials. Consequently, the wear behaviour of a tribo couple can be improved by selecting an adequate mating material. The results reveal the necessity to control RH in tribological tests. For estimation of the performance of tribo couples under varying environmental conditions, a variation of RH is required. In tribo couples with single phase SiC, either as ball or disc, the tribological behaviour of the system is dominated by SiC. The friction behaviour of the composite material is in between the behaviour of the two single phase materials, Si3N4 and SiC, whereas the wear behaviour is very similar to that of single phase Si3N4. Dordrecht Springer Science Business Media B.V. 2009 Tribology letters 33 3 211 219 10.1007/s11249-009-9413-y 2016-02-19 OPUS4-19001 Zeitschriftenartikel Wäsche, Rolf; Paulick, Carl; Steinborn, Gabriele; Richter, V.; Werner, M. Joining of ceramic components in the green state via LPIM It has been successfully demonstrated that ceramic materials can be joined in the green state without a second phase by using low pressure injection molded parts. The investigation of the joining interface revealed that a high quality interface can be achieved by carefully adjusting the different manufacturing steps. The use of monomodal particle size distribution in the used powder CT3000SG is inferior to a broader particle size distribution obtained by replacing 33% of the finer alumina powder by coarser CT1200SG. In this way the dewaxing process is significantly improved when the wall thickness of the part exceeds 3 mm. The investigation of the mechanical properties of the joined and sintered parts revealed, that the bending strength of the joined specimens achieved about 80 % of the unjoined, monolithic specimens. Zurich Trans Tech Publ. 2005 Advanced materials research 29-30 4th International Conference on Advanced Materials and Processing Hamilton, New Zealand 2006-12-10 2006-12-13 207 210 2016-02-19 OPUS4-22870 Vortrag Wäsche, Rolf Analysis of oxidative processes in SiC-TiC-TiB2 ceramic composites during tribological loading 2009 Tribochemistry 2009 Tribochemistry 2009 Kyoto, Japan 2009-09-02 2009-09-04 2016-02-19 OPUS4-22871 Vortrag Wäsche, Rolf Characterisation of tribological interface in low wear magneli type ceramics 2009 International Conference on Characterisation and Control of Interfaces (ICCC 2009) International Conference on Characterisation and Control of Interfaces (ICCC 2009) Kurashiki, Japan 2009-09-06 2009-09-09 2016-02-19 OPUS4-22872 Vortrag Wäsche, Rolf Extended tribological study on carbon nitride coatings under oscillating sliding conditions 2009 World Tribology Congress (WTC) World Tribology Congress (WTC) Kyoto, Japan 2009-09-09 2009-09-11 2016-02-19 OPUS4-22873 Vortrag Wäsche, Rolf Experimental study on wear of dental ceramic materials - tests in artificial saliva 2010 17. International Colloquium on Tribology 17. International Colloquium on Tribology Filderstadt, Germany 2010-01-19 2010-01-21 2016-02-19 OPUS4-22874 Vortrag Wäsche, Rolf Wear of thin steel wires 2010 Nordtrib 2010 Nordtrib 2010 Luleå, Sweden 2010-06-08 2010-06-11 2016-02-19 OPUS4-22875 Vortrag Wäsche, Rolf Wear of SiC-TiC-TiB2 ceramics at high temperatures and sliding speeds in air 2010 Asiatrib 2010 Asiatrib 2010 Perth, Australia 2010-12-05 2010-12-09 2016-02-19 OPUS4-19364 Posterpräsentation Wäsche, Rolf Influence of deposition parameters on tribological properties of CNx coatings 2009 WOM, 17th International Conference on Wear of Materials WOM, 17th International Conference on Wear of Materials Las Vegas, NV, USA 2009-04-19 2009-04-22 2016-02-19 OPUS4-20344 Zeitschriftenartikel Wäsche, Rolf; Hartelt, Manfred; Weihnacht, V. Influence of counterbody material on wear of ta-C coatings under fretting conditions at elevated temperatures The high temperature tribological performance of tetrahedral amorphous carbon coatings has been analyzed at elevated temperatures up to 250 °C in air against three different counterbody materials-steel 100Cr6, a-alumina and silicon nitride. The results show that the counterbody material influences the friction and wear behavior and therefore coating life time strongly. This effect is well known for these coatings at room temperature under dry environmental conditions, equivalent to conditions above 100 °C when water molecules desorb from the surface. However, the sharp difference in tribological performance between silicon nitride on the one hand and alumina and steel on the other hand cannot be understood in this context. Analyzing the friction behavior during the running-in phase, it is evident that only alumina and steel form a stable interface with constant low friction and relatively low wear rates. Silicon nitride forms an unstable interface with fluctuating COF and relatively high wear rates due to its own inherent tendency to tribo-oxidation. Amsterdam Elsevier 2009 Wear 267 12 2208 2215 10.1016/j.wear.2009.08.041 2016-02-19 OPUS4-21070 Beitrag zu einem Sammelband Wäsche, Rolf; Hartelt, Manfred; Gräber, H.G. Experimental study on wear of dental ceramic materials - tests in artificial saliva Technische Akademie Esslingen (TAE) 2010 17th International colloquium tribology - Solving friction and wear problems 3-924813-80-9 17th International colloquium tribology - Solving friction and wear problems Stuttgart/Ostfildern, Germany 2010-01-19 2010-01-21 Special aspects of tribology 1 7 2016-02-19 OPUS4-18651 Zeitschriftenartikel Kloß, Heinz; Wäsche, Rolf Analytical approach for wear prediction of metallic and ceramic materials in tribological applications Wear mechanisms, as adhesion, abrasion, fatigue and tribochemical wear, are complex in their physical and chemical nature. A theoretical description and prediction of wear are in most cases still far from reality. It is, therefore, important to use test rigs before a practical application of a given material combination under tribological loading. On the other hand, model equations can be helpful for wear description, if a single wear mechanism is dominant. Under oscillating and continuous sliding contact conditions, equations for wear calculation are presented to describe running-in and stationary wear behaviour of metals and ceramics. By using shear energy density, real area of contact, flash temperature, activation energy and numerical simulations with the method of movable cellular automata (MCA), wear data were calculated and compared to experimental laboratory results. Amsterdam Elsevier 2009 Wear 266 3-4 476 481 10.1016/j.wear.2008.04.034 2016-02-19 OPUS4-20023 Beitrag zu einem Sammelband Hartelt, Manfred; Wäsche, Rolf Volumetrische Verschleiß-Berechnung an gekrümmten Kontaktgeometrien Aachen Gesellschaft für Tribologie e.V. 2009 50. Tribologie-Fachtagung - Reibung, Schmierung und Verschleiß - Forschung und praktische Anwendung I 978-3-00-028824-1 50. Tribologie-Fachtagung - Reibung, Schmierung und Verschleiß - Forschung und praktische Anwendung Göttingen, Deutschland 2009-09-21 2009-09-23 3-1 - 3-9 2016-02-19 OPUS4-22208 Zeitschriftenartikel Wäsche, Rolf; Hartelt, Manfred; Springborn, U.; Bewilogua, K.; Keunecke, M. Wear of carbon nitride coatings under oscillating sliding conditions An extended study on tribological properties of carbon nitride coatings under oscillating sliding conditions has been carried out. The coatings were prepared by reactive magnetron sputtering with graphite target using nitrogen as reactive gas in an argon/nitrogen atmosphere during the deposition process to deposit carbon nitride, CNx. Coating thickness was about 2 µm. A 200–300 nm thick Ti interlayer was used to enhance adhesion. The nitrogen flow during the deposition was varied to control the amount of nitrogen in the coating. Maximum amount of N-content was about 28 at%, achieved at a maximum N2 flow rate. Other deposition parameters were target to substrate distance, substrate temperature during deposition and bias voltage. The results show a large variation of hardness depending mainly on the nitrogen content and bias voltage. Higher bias voltage produced harder coatings as did lower nitrogen content. The tribological properties were tested unlubricated and lubricated by paraffin oil under gross slip fretting conditions at room temperature against alumina as counter material. Most coatings, but not all, showed a more or less pronounced dependence of wear on relative humidity with wear rates from 10-5 to 10-6 mm3/Nm. The best coatings with regard to a low wear rate and the least dependence upon relative humidity were carbon nitride coatings deposited at elevated substrate temperatures up to 350 °C. The wear resistance of these coatings was increased under the most severe conditions by about one order of magnitude. The results are discussed on the basis of a transfer layer formation. The results show clearly that wear is not significantly correlated to the coating hardness which itself is strongly dependant on the nitrogen content. However, under lubricated conditions with paraffin oil, wear rates were generally very low with wear coefficients at about 10-8 mm3/Nm. Amsterdam Elsevier 2010 Wear 269 11-12 816 825 10.1016/j.wear.2010.08.010 2016-02-19 OPUS4-38209 Vortrag Wäsche, Rolf Analysing wear particles on the nano scale A novel method for preparation and chracterisation of nano scale wear particles by means of TSEM was presented. The tribological tests were carried out in a lubricated system at a temperature of 80°C. 2016 The 17th Nordic Symposium on Tribology - NORDTRIB 2016 Hämeenlinna, Finland 14.06.2016 17.06.2016 2016-11-11 OPUS4-38135 Beitrag zu einem Tagungsband Harsha, A. P.; Wäsche, Rolf Tribological studies on polyetherimide composites sliding against steel under reciprocating conditions The friction and wear properties of polyetherimide composites under dry oscillating sliding condition at room temperature (RT) as well as at elevated temperature (120 °C) was investigated. The polymer specimens were made to oscillate against steel cylinder as a counterpart. The friction and wear properties of PEI and composites were strongly influenced by the temperature. In case of carbon fiber composite abrasive action of carbon fibers has severely damaged the counterpart and resulted in accelerated wear of the composite at RT. Solid lubricants filled (PTFE, MoS2, graphite) along with glass fiber is beneficial in improving the friction and wear performance of the PEI composite at RT, whereas at elevated temperature wear performance was deteriorated. 2016 PolyTrib 2016 2nd International Conference on Polymer Tribology Ljubljana, Slovenia 15.09.2016 16.09.2016 2016-11-07 OPUS4-33761 Vortrag Wäsche, Rolf A study of tribological behaviour of a-C:H coatings under lubricated conditions up to 250°C 2015 6. International Conference on Mechanics and Materials in Design 6. International Conference on Mechanics and Materials in Design P. Delgada/Azores, Portugal 2015-07-26 2015-07-30 2016-02-20 OPUS4-34883 Beitrag zu einem Tagungsband Pfeffer, D.; Scholz, Christian; Belly, C.; Wäsche, Rolf; Schlaak, H.F.; Pott, P.P. Influence of the actuation waveform on the performance of piezoelectric stick-slip actuators Performance and efficiency of piezo-electric stick-slip actuators are dependent on the waveform of the electrical actuation of the piezo-stack. This paper compares between a conventional saw-tooth actuation with two waveforms that feature softer acceleration in order to minimize the duration of the slip-phase. It is shown that the proposed waveforms increase both maximum mechanical output power (by 43%) and overall efficiency (by 25%) of the examined actuator. 2015 IKMT 2015 - Innovative Klein- und Mikroantriebstechnik 146 978-3-8007-4072-7 IKMT 2015 - Innovative Klein- und Mikroantriebstechnik Köln, Germany 14.09.2015 15.09.2015 100 104 2016-02-20 OPUS4-34921 Zeitschriftenartikel Harsha, A.P.; Wäsche, Rolf; Hartelt, Manfred Friction and wear studies of polyetherimide composites under oscillating sliding condition against steel cylinder Tribological properties of neat polyetherimide (PEI), glass, carbon fiber, and solid lubricants filled PEI composites are presented in this article. The aim of this study was to investigate the friction and wear properties of these composites under dry oscillating sliding condition at room temperature (RT) as well as at elevated temperature (120 °C). The polymer specimens were made to oscillate against steel cylinder as a counterpart. The friction and wear properties of PEI and composites were strongly influenced by the temperature. Incorporation of carbon fiber in the PEI matrix has increased the wear rate at RT, while at elevated temperature this trend was opposite. Abrasive action of carbon fibers has severely damaged the counterpart and resulted in accelerated wear of the composite at RT. Solid lubricants filled (PTFE, MoS2, graphite) along with glass fiber is beneficial in improving the friction and wear performance of the PEI composite at RT, whereas at elevated temperature wear performance was deteriorated. Tribological performance of neat PEI and glass fiber composite was similar with each other at RT. Scanning electron micrographs and optical micrographs of the worn polymer specimens and the steel cylinders was used to study the possible wear mechanisms. The present test results were also compared with data available on the reciprocating wear of PEI and composites in the literature and trends have been reported. Manchester, NH Society of Plastics Engineers 2015 Polymer composites 38 1 48 60 10.1002/pc.23559 2016-02-20 OPUS4-34324 Vortrag Wäsche, Rolf A study on wear particle analysis in lubricated steel-steel contacts 2015 International Tribology Congress/ITC 2015 International Tribology Congress/ITC 2015 Tokyo, Japan 2015-09-15 2015-09-20 2016-02-20 OPUS4-34325 Vortrag Wäsche, Rolf Ceramics and DLC - influence of tribochemistry on sliding under lubricated conditions at elevated temperatures 2015 Satelite Symposium on Tribochemistry Satelite Symposium on Tribochemistry Nikko, Japan 2015-09-13 2015-09-15 2016-02-20 OPUS4-35043 Zeitschriftenartikel Hartelt, Manfred; Wäsche, Rolf; Hodoroaba, Vasile-Dan Verschleißpartikel-Analyse mit Rasterelektronenmikroskopie und energiedispersiver Röntgenspektrometrie im Transmissionsmodus (TSEM/EDX) Untersucht wurden Verschleißpartikel als elektronentransparente Proben auf dünnen Trägerfolien mit einem hochauflösendem Rasterelektronenmikroskop und energiedispersiver Röntgenspektrometrie im Transmissionsmodus. Die hohe laterale Auflösung dieser modernen Methoden ermöglicht eine morphologische Charakterisierung der Verschleißpartikel bis in den nm-Bereich. Die hochauflösende Elementanalyse erlaubt eine Interpretation der Zusammensetzung und damit Rückschlüsse auf die Verschleißpartikelbildung. Die tribologischen Untersuchungen sind an einem Modell-Verschleißtribometer nach DIN 51834-2 geschmiert, aber ohne Ölkreislauf, durchgeführt worden. Die Präparation der Verschleißpartikel über eine Entnahme und Übertragung einer geringen Schmierstoffmenge mit einer Mikropipette auf eine TEM-Trägerfolie ist mit einem geringen Aufwand möglich. Der präparative Aufwand ist relativ gering. Das benötigte Schmierstoffvolumen beträgt wenige Mikroliter (0,001 ml). Die Untersuchung zeigt die geringe geometrische Größe der Verschleißpartikel und bestätigt indirekt die These der Reaktionsschichtbildung mit einer geringen Schichtdicke, die ständig verschleißt und sich stetig neu bildet. Die beschriebenen Verschleißprozesse sind in der Modell-Verschleiß-Prüfung mit sehr hohen Pressungen am Versuchsbeginn nachweisbar. Renningen Expert Verlag Gesellschaft für Tribologie 2015 Tribologie und Schmierungstechnik 62 6 5 11 2016-02-20 OPUS4-33808 Beitrag zu einem Tagungsband Wäsche, Rolf; Hartelt, Manfred; Ehrke, Roman Silva Gomes, J.F.; Meguid, S.A. A study on tribological behaviour of a-C:H coatings under lubricated conditions up to 250 °C The influence of temperature and counterbody material on the tribological properties of a-C:H coatings deposited on Cronidur 30 steel has been investigated in a lubricated ball on disk contact situation. The results show, that the wear volumes of the system increase exponentially with increasing temperature. Two different wear mechanisms seem to have a major influence: First, the abrasive action due to materials hardness and second, the tribooxidation when silicon nitride is counter material. 2015 M2D2015 - 6th International conference on mechanics and materials in design (Proceedings) 978-989-98832-3-9 M2D2015 - 6th International conference on mechanics and materials in design Ponta Delgada, Azores 26.07.2015 30.07.2015 445 446 2016-02-20 OPUS4-38690 Vortrag Wäsche, Rolf Tribological studies on polyetherimide composites sliding against steel under reciprocating conditions Results of tribological tests on polyetherimide composites were presented. The tests were carried out at room temperature as well as at 120°C. Counter body was steel 100Cr6. 2016 PolyTrib 2016. 2nd International Conference on Polymer Tribology Ljubljana, Slovenia 15.09.2016 16.09.2016 2016-12-15 OPUS4-38879 Beitrag zu einem Tagungsband Wäsche, Rolf; Woydt, Mathias Tribological characterization of niobium carbide with different binder materials Wear of Niobium carbide with nickel binder has been experimentally characterized under dry, oscillating sliding conditions against steel and a-alumina up to 600°C. Indian Institute of Technology (BHU) 2016 Tribology for sustainable development National Tribology Conference/NTC-2016 Varanasi, India 08.12.2016 10.12.2016 1 2 2017-01-04 OPUS4-43896 Beitrag zu einem Tagungsband Woydt, Mathias; Wäsche, Rolf; Brandt, Guido; Ehrke, Roman; Yano, S.; Sasaki, S. Tribology in hot steam for energy recovery The wear rates of self-mated alumina couples show that friction as well as wear is largely determined by the above-mentioned hydro-thermal conditions. The presence of water and its amount available in the surrounding system either in liquid or in gaseous form plays a key role for friction and wear behavior and can be beneficial for the tribological profile of steam degradation resistant materials. Hot steam enhances the tribo-chemical formations of oxides and hydroxides on MgO-ZrO2 alumina and antimony impregnated carbon. Technische Akademie Esslingen 2018 Industrial and Automotive Lubrication 21th International Colloquium Tribology Stuttgart/Ostfildern, Germany 09.01.2018 11.01.2018 1 2 2018-01-24 OPUS4-44449 Zeitschriftenartikel Wäsche, Rolf; Brandt, Guido; Ehrke, Roman; Nolze, Gert; Schmid, Thomas; Sasaki, S.; Woydt, Mathias Wear behaviour of alpha-alumina in hot steam at high contact pressure The work examines the wear behaviour of α-aluminium oxide by combining thermodynamic modelling with advanced wear testing as well as analytical methods to get a better understanding of this structural ceramic material wear behavior and its possible use in high temperature steam environment. Elsevier B.V. 2018 Wear 404-405 22 30 10.1016/j.wear.2018.02.012 2018-03-12 OPUS4-44622 misc Salge, T.; Wäsche, Rolf; Hodoroaba, Vasile-Dan Advanced light element and low energy X-ray analysis of a TiB2 - TiC - SiC ceramic material using EDS spectrum imaging The accurate EDS microanalysis of light elements such as boron and carbon by spectrum imaging will be demonstrated using a sintered hard ceramic material composed of the three major phases titanium boride (TiB2), titanium carbide (TiC), silicon carbide (SiC) and minor phases, sub-μm in size. The combination of these three materials leads to improved mechanical and tribological properties. Silicon carbide is a material used for mechanical seals. It has the disadvantage of reduced failsafe running functions, causing increased wear when running dry. The added titanium components (TiC and TiB2) improve the failsafe running functions. This technology has already been transferred to industrial applications. Berlin Bruker Nano GmbH 2018 1 5 2018-04-05 OPUS4-51170 Zeitschriftenartikel Rawat, S. S.; Harsha, A. P.; Khatri, O. P.; Wäsche, Rolf Pristine, reduced, and alkylated graphene oxide as additives to paraffin grease for enhancement of tribological properties Pristine, reduced, and alkylated graphene oxides are applied as lubricating additives in paraffin grease. It has revealed that their crystalline structure governs the tribological properties of grease for steel tribo-pair. The microstructural analyses of grease samples showed that a loose fiber network of soap in the presence of graphene-based additive allows their facile release for efficient lubrication. The surface analyses based on the microscopic and elemental mapping show the development of a graphene-derived protective film on the worn scars, which protected the tribo-surfaces and subsided the wear. The reduced graphene oxide (rGO) with the interlamellar distance of 0.35 nm in the (002) plane provided minimum resistance to shear and exhibited maximum reduction in coefficient of friction (COF) for the paraffin grease. The presence of oxygen functionalities in the basal of pristine and alkylated graphene oxide (GO) compromised the interlamellar shearing under tribo-stress; consequently, higher COF than that of rGO. ASME 2021 Journal of Tribology 143 2 021903-1 021903-11 10.1115/1.4047952 2020-09-09 OPUS4-32975 Zeitschriftenartikel Rabe, Torsten; Wäsche, Rolf Sintering behaviour of nanocrystalline titanium nitride powders The sintering behaviour of one microcrystalline and several nanocrystalline TiN powders was investigated by means of a gas pressure furnace with an integrated dilatometer. The investigated nanocrystalline powders strongly differ in the sintering activity. It can be concluded from the experiments, that small grain size, narrow grain size distribution and a low oxygen content are the most important prerequisites for high sintering activity of the nanocrystalline TiN powders. The extraordinary sintering activity of the best TiN powder makes it possible to produce a dense (< 2 % porosity), pure (no sintering aids) and nanostructured (mean diameter of crystals about 100 nm) TiN bodies. New York, NY Pergamon Press 1995 Nanostructured materials 6 1-4 357 360 2016-02-20 OPUS4-32976 Zeitschriftenartikel Rabe, Torsten; Prümmer, R.; Wäsche, Rolf Explosive compaction of nanosized TiN-powders Aedermannsdorf, Switzerland Trans Tech Publications 1997 Materials science forum 235-238 285 290 10.4028/www.scientific.net/MSF.235-238.285 2016-02-20 OPUS4-32977 Zeitschriftenartikel Wäsche, Rolf; Yarim, Rasim; Klaffke, Dieter; Hartelt, Manfred Oscillating sliding wear behaviour of SiC, TiC, TiB2, 59SiC-41TiB2 and 52SiC-24TiC-24TiB2 materials up to 750°C in air The tribological behaviour of different monolithic and composite ceramics was evaluated in the temperature range between room temperature and 750°C. The test method was oscillating sliding with a ball-on-disk arrangement in an SRV machine. Alumina balls were used as counter body. The friction behaviour was determined on-line, and the wear behaviour was determined from calculations on the basis of wear scar dimensions and profilometric measurements. The friction depends on temperature and shows an increase for most materials for increasing temperature; the smallest friction at all temperatures is found for monolithic TiC. The wear behaviour shows different trends for the different materials. In tests against SiC a maximum of wear is found at 500°C, for TiC at 200°C and for TiB2 at 750°C. The composite ceramics suffer the smallest wear of all materials in the range from 200°C to 500°C. Deal Coppin 2006 TriboTest 12 99 111 10.1002/tt.8 2016-02-20 OPUS4-32978 Zeitschriftenartikel Kimmari, E.; Podgursky, V.; Simunin, M.; Adoberg, E.; Surzenkov, A.; Viljus, M.; Hartelt, Manfred; Wäsche, Rolf; Sildos, I.; Kulu, P. Tribological behavior of carbon nanofibers deposited on hard nanocomposite (nc-Ti1 - xAlxN)/(a-Si3N4) coating Main focus was on the deposition of carbon nanofibers (CNFs) onto the hard nanocomposite (nc-Ti1 - xAlxN)/(a-Si3N4) (nACo®) coating surface and the investigation of the structure and tribological properties of CNFs. The alcohol chemical vapor deposition (ACCVD) method was employed to prepare CNFs and the deposition temperatures were 600 and 700 °C, respectively. Prior to the CNF deposition, Ni catalyst was deposited onto the nACo® surface using the magnetron sputtering. The influence of the deposition temperature on the carbon nanofibers structure was investigated by Raman spectroscopy and scanning electron microscopy (SEM). The higher order degree of CNF structure is observed with increasing deposition temperature. Tribological tests were carried out under fretting contact conditions against Al2O3 ball. It is shown that the coefficient of friction (COF) decreases from 1.0 to 1.2 for the clean nACo® surface to 0.2-0.4 for the CNF layers deposited on the nACo® surface. The roughness of the nACo® surface was varied and a higher durability of the CNF layers deposited on the rougher nACo® surface is found. Lausanne Elsevier Science 2013 Surface and coatings technology 225 21 25 10.1016/j.surfcoat.2013.03.011 2016-02-20 OPUS4-33498 Beitrag zu einem Tagungsband Pfeffer, D.; Scholz, Christian; Belly, C.; Wäsche, Rolf; Schlaak, H.F.; Pott, P.P. Modular test bed for performance assessment of piezoelectric stick-slip actuators Stepping piezoelectric actuators based on the stick-slip effect inherently make use of a friction contact between strator and rotor. This contact defines not only the actuator's performance but also is prone to wear and tear. For broad use, the actuator has to be able to perform around 1 million strokes. To assess the actuator's performance in terms of force, speed, mechanical output, electrical input, and long-term stability under different load- and environmental conditions, as well as different friction partners, a dedicated test-bed for a LSPA30µXS motor by Cedrat Technologies has been set up. Messe Bremen / WFB Wirtsvchaftförderung Bremen GmbH 2014 Actuator 2014 - 14th International conference on new actuators & 8th International exhibition on smart actuators and drive systems (Proceedings) 978-3-933339-22-5 Actuator 2014 - 14th International conference on new actuators & 8th International exhibition on smart actuators and drive systems Bremen, Germany 2014-06-23 2014-06-25 P 50, 617 620 2016-02-20 OPUS4-33525 Zeitschriftenartikel Wäsche, Rolf; Hartelt, Manfred; Hodoroaba, Vasile-Dan Analysis of nanoscale wear particles from lubricated steel-steel contacts A new method for sampling wear particles directly from the lubricant reservoir has been developed and applied successfully for analyzing wear particles by high-resolution scanning electron microscopy in transmission mode having coupled energy-dispersive X-ray spectroscopy. The lubricated tribological testing was carried out with fully formulated as well as with non-formulated synthetic base oil. It was possible to analyze individual particles with dimensions as small as about 5-30 nm which are likely the 'primary' wear particles. A majority of the particles, however, are agglomerated and, thus, lead to the formation of larger agglomerates of up to a few micrometers. Chemical analysis led to the conclusion that most of the observed particles generated in formulated oil, especially the larger ones, are composed of the additives of the lubricant oil. In non-formulated base oil, the primary particles are of similar dimensions but contain only iron, chromium and oxygen, but most likely stem from the mating materials. This finding points to the fact that the main wear mechanism under lubricated conditions with fully formulated oil is more like a continuous shearing process rather than a catastrophic failure with the generation of larger primary particles. When the oil is non-formulated, however, several wear mechanisms act simultaneously and the wear rate is increased significantly. Generated larger primary particles are milled down to the nanoscale. When the oil is fully formulated, wear mainly takes places at the additive layer or tribofilm; thus, the steel surface is protected. Dordrecht Springer Science Business Media B.V. 2015 Tribology letters 58 3 49-1 - 49-10 10.1007/s11249-015-0534-1 2016-02-20 OPUS4-33526 Zeitschriftenartikel Harsha, A.P.; Wäsche, Rolf; Hartelt, Manfred Tribological studies on polyetherketone composite under reciprocating sliding condition against steel cylinder Tribological studies on neat polyetherketone (PEK) and glass fiber reinforced PEK composite were carried out at room and elevated temperature (120 °C). The objective of this study was to characterize for friction and wear properties under dry reciprocating sliding condition at different experimental conditions. The polymer specimens were made to oscillate against steel cylinder as a counterpart. This kind of contact condition are frequently found in bushes, sliding bearing, electronic parts, seals, etc. The friction and wear behavior of neat PEK and composite was quite different at room temperature and elevated temperature. It was observed that glass fiber reinforcement is beneficial in controlling the wear of PEK matrix at room temperature than at elevated temperature. The test results are discussed by considering the surface properties i.e. material removal and film transfer formation. Scanning electron micrographs and optical micrographs of the worn polymer and steel cylinder was used to study the wear mechanisms. London Institution of Mechanical Engineers 2015 Proceedings of the institution of mechanical engineers - Part J, Journal of engineering tribology 229 7 795 806 10.1177/1350650115570403 2016-02-20 OPUS4-34734 Zeitschriftenartikel Cappella, Brunero; Hartelt, Manfred; Wäsche, Rolf High resolution imaging of macroscopic wear scars in the initial stage The topography of wear scars on the surface of a steel disc coated with a diamond-like carbon (DLC) layer has been investigated with an Atomic Force Microscope (AFM). AFM topography images have been combined together taking advantage of the stitching technique for the study of wear scars in their initial stage. Moreover, the topography of the sample has been acquired before and after the sliding tests. In this way even very small changes of the sample surface (<10 nm) can be detected. Three main phenomena taking place at the very initial stage of wear could be identified: the abrasion of small asperities bulging out of the sample surface, the carving of swallow grooves with depth under 20 nm, and the partial or total closure of cavities present on the surface. This last phenomenon shows that, before the carving of a wear scar, the plastic deformation of particular regions of the sample, i.e. the volume around the cavities, takes place already after few cycles (in this case between 400 and 800) in the initial phase of the sliding test. Amsterdam Elsevier B.V. 2015 Wear 338-339 372 378 10.1016/j.wear.2015.07.013 2016-02-20 OPUS4-30289 Zeitschriftenartikel Wäsche, Rolf; Hartelt, Manfred; Cappella, Brunero The use of AFM for high resolution imaging of macroscopic wear scars In this article we demonstrate the use of atomic force microscopy (AFM) measurements for the study of macroscopic wear scars. By stitching AFM images acquired over the wear scar, the detailed structure of the scar can be characterized even when the scar is much wider than the typical maximum scan range of the AFM (50-100 µm). The results obtained by AFM are compared with those yielded by white light interferometry (WLI). The comparison validates the WLI measurements; at the same time, it shows decisive differences in the resolutions of these two methods. As a consequence, AFM measurements are necessary whenever a precise characterization of the structure of the scar is required. However, since stitching of AFM images is rather time-consuming, white light interferometry is recommended as a faster method whenever experiments are aimed at just a gross characterization of the scar and the measurement of mean quantities (e.g. the wear volume). Amsterdam Elsevier 2014 Wear 309 1-2 120 125 10.1016/j.wear.2013.11.009 2016-02-20 OPUS4-49779 Zeitschriftenartikel Harsha, A. P.; Wäsche, Rolf; Joyce, T. J. Wear of biopolymers under reciprocating sliding conditions against different counterfaces In the present work it was shown the investigation of wear resistance of ultrahigh-molecular weight polyethylene (UHMWPE) and crosslinked polyethylene (XLPE) against different counterfaces. Friction and wear studies were evaluated under dry reciprocating sliding conditions at room temperature. Society of Plastics Engineers 2019 Polymer Engineering and Science 59 11 2356 2366 10.1002/pen.25239 2019-11-27 OPUS4-40513 Posterpräsentation Wäsche, Rolf Colloidal processing of metal bonded niobium carbide (NbC-Ni) The manufacturing of NbC with Ni binder with addition of titanium carbide by using a colloidal process for blending the different powders without a milling step were investigated. The the sintering process and formation of the resulting microstructures, the phase relations and the hardness of the produced cermet materials are characterized. 2017 19. Plansee Seminar Reutte, Austria 29.05.2017 02.06.2017 2017-06-13 OPUS4-45643 Vortrag Wäsche, Rolf Niobium carbide, a new cermet material with excellent properties Niobium carbide is a ceramic material which can be used with excellent results to replace tungsten carbide with cobalt binder. Furthermore, it might be manufactured by classic ceramic technologies and even colloidal processing. To achieve high toughness and strength, it is necessary to have a perfect mix of hard phase and binder, which is mainly achieved by ball milling. Mechanical and physical properties as well as results on different tribological and application-oriented machining tests are presented. The results have been compared with results obtained with NbC grades with Co and Fe3Al binders as well as with pure binderless hot-pressed NbC and SPS sintered Nb2O5. 2018 ICCCI 2018 - 6th Int. Conf. on the Characterization and Control of Interfaces for High Quality Advanced Materials and 54th Summer Symposium on Powder Technology Kurashiki, Japan 09.07.2018 12.07.2018 2018-08-06 OPUS4-46034 Zeitschriftenartikel Wäsche, Rolf; Jayachandran, Ashok Raj; Brandt, Guido; Schmid, Thomas; Tamura, T.; Nakase, T. Tribofilm formation of a-C:H coatings under influence of temperature in boundary lubricated oscillating sliding against alumina and silicon nitride Gegenstand dieses Beitrags ist der Einfluss von Temperatur und Gegenkörperwerkstoff auf die Bildung von Tribofilmen auf a-C:H Beschichtungen. Dies wurde mit einer Kugel-Ebene Anordnung im geschmierten Kontakt untersucht. Tübingen expert Verlag 2018 Tribologie + Schmierungstechnik 65 5 28 37 2018-09-25 OPUS4-46036 Vortrag Wäsche, Rolf Influence of temperature on tribological behaviour of DLC coatings under lubricated conditions up to 250°C The lecture deals with both friction and wear processes in ceramic - a-C:H Systems. 2018 AsiaTrib 2018 Kuching, Malaysia 16.09.2018 20.09.2018 2018-09-25 OPUS4-46430 Zeitschriftenartikel Harsha, A. P.; Wäsche, Rolf Influence of temperature on friction and wear characteristic of polyaryletherketones and their composites under reciprocating sliding condition In the present work it was shown the tribological behavior of different polyaryletherketones (PAEKs) and their composites under reciprocating sliding conditions at room temperature as well as at elevated temperature (120°C). Springer 2018 Journal of Materials Engineering and Performance 27 10 5438 5449 10.1007/s11665-018-3633-y 2018-11-01 OPUS4-41127 Vortrag Wäsche, Rolf Wear of alpha-Alumina in hot steam up to 300°C Selfmated alpha-alumina sliding couples habe been investigated under oscillating sliding at 100 N load in different humidity conditions in air as well as in hot steam up to temperatures of 300°C and ambient pressures up to 4 bar. 2017 7th International Conference on Mechanics and Materials in Design Albufeira, Portugal 11.06.2017 15.06.2017 2017-07-26 OPUS4-41128 Beitrag zu einem Tagungsband Wäsche, Rolf; Ehrke, Roman; Woydt, Mathias Wear of alpha-alumina in hot steam up to 300°C Selfmated alpha-alumina sliding couples have been investigated under oscillating sliding at 100 N load in different humidity conditions in air as in hot steam up to temperatures of 300°C and ambient pressures up to 4 bar. Avintes, Portugal LusoImpress S.A. Silva Gomes, J. F., Meguid, S. A. 2017 Progress in Mechanics and Materials in Design 978-989-98832-6-0 7th International Conference on Mechanics and Materials in Design Albufeira, Portugal 11.06.2017 15.06.2017 265 266 2017-07-26 OPUS4-40596 Beitrag zu einem Tagungsband Wäsche, Rolf; Steinborn, Gabriele; Woydt, Mathias Colloidal processing of metal bonded niobium carbide Manufacturing of Niobium carbide cermets with nickel binder and different additions of titanium carbide has been realized by colloidal processing in aqueous environment. 2017 International Conference on Refractory Metals and Hard Materials 19. Plansee Seminar Reutte, Austria 29.05.2017 02.06.2017 HM 135/1 HM 135/11 2017-06-15 OPUS4-42152 Vortrag Wäsche, Rolf Colloidal processing of Nbc cermets with Ni binder Niobium-titanium carbide cermets with nickel binder have been prepared by colloidal processing in water without a milling step by using Poly-diallyl-dimethyl-ammonium chloride (Poly-DADMAC) as a dispersant. Homogeneous microstructures with relative densities larger than 99% of the theoretical density have been achieved by gas pressure sintering in argon atmosphere. However, mechanical properties like hardness and strength were slightly decreased due to precipitation of free carbon. 2017 ISNT2017 & ISSNOX5 - 9th International Symposium on Nitrides & 5th International Symposium on SiAlONS and Non-Oxides Sapporo, Japan 27.08.2017 01.09.2017 2017-09-26 OPUS4-46213 Beitrag zu einem Tagungsband Wäsche, Rolf; Ehrke, R.; Kramer, R.; Jayachandran, A. R.; Brandt, G. Influence of temperature on tribological behaviour of DLC coatings under lubricated conditions up to 250°C In the present work it was shown that there is an influence of temperature and counter body material on the tribological properties of a-C:H coatings deposited on Cronidur 30 steel in a lubricated ball on disk contact situation. 2018 Proceedings of Asia International Conference on Tribology ASIATRIB 2018 Kuching, Sarawak, Malaysia 17.09.2018 20.09.2018 253 254 2018-10-09 OPUS4-47873 Zeitschriftenartikel Wäsche, Rolf; Sato, K.; Brandt, Guido; Schmid, Thomas; Sasaki, S.; Woydt, Mathias Wear behaviour of MgO stabilized zirconia in hot steam environment up to 400°C Self-mated magnesia stabilized zirconia (Mg-PSZ) ceramic sliding couples have been investigated at 100 N load (P0max= 1324 MPa) in oscillating sliding conditions in different humidity conditions in air and in hot steam. Temperatures have been varied up to 400 °C and pressures up to 6 bars. The results show that the wear behavior of MgO-ZrO2 under high Hertzian contact pressures is strongly dependent on temperature and is similar for both dry oscillating and oscillating in hot steam. However, although the evolution in wear rates on temperature is similar and the wear rates of MgO-ZrO2 plunged above 300 °C in hot steam and air by nearly three orders of magnitude, SEM micrographs revealed in hot steam at 400 °C smooth wear tracks. In contrast, hot steam enhanced the tribochemistry of self-mated alumina couples and reduced wear rates. Hot steam decreased the coefficients of friction of MgO-ZrO2 with increasing temperature, but not the wear rates. Elsevier B.V. 2019 Wear 426-427 428 432 10.1016/j.wear.2019.01.047 2019-04-29 OPUS4-56903 Zeitschriftenartikel Harsha, A. P.; Wäsche, Rolf; Joyce, T. J. Friction and wear of two polyethylenes under different tribological contact conditions Tribological properties of ultrahigh-molecular weight polyethylene (UHMWPE) and cross-linked polyethylene (XLPE) were studied in two different wear modes. Firstly, reciprocating sliding wear studies under non-conformal contact investigated the effects of counterface surface roughness (polished, lapped and ground) of Ti6Al4V on the friction and wear of the polyethylenes. Secondly, two-body abrasive wear studies in conformal contact against different abrasive grit size papers were also carried out to ascertain the wear sensitivity of the polyethylenes under these adverse conditions. Wear mechanisms were studied using optical and scanning electron micrographs. The results of the reciprocating sliding wear studies showed that surface roughness of the counterface influenced friction and wear characteristics although no correlation was found between the coefficient of friction and specific wear rate. XLPE demonstrated wear sensitivity, particularly under severe abrasive wear condition. The results indicated that the performance of the polyethylenes greatly depends upon the tribological system under which it is operating. London Sage Publishing 2021 Polymers and polymer composites 29 5 393 404 10.1177/0967391120920130 2023-01-26