TY - CONF A1 - Woydt, Mathias T1 - Fuel economy through engine oils based on polyalkylene glycols T2 - 18. Int. Colloq. Tribology - Industrial and Automotive Lubrication CY - Ostfildern, Germany DA - 2012-01-10 PY - 2012 AN - OPUS4-25342 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Woydt, Mathias T1 - Nullverschleiß T2 - Tribologie-Kolloquium (TU Chemnitz) CY - Chemnitz, Germany DA - 2012-06-21 PY - 2012 AN - OPUS4-26031 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CHAP A1 - Igartua, A. A1 - Fernandez, X. A1 - Woydt, Mathias A1 - Luther, R. A1 - Illarramendi, I. ED - Lakshminarayanan, P.A. ED - Nayak, N.S. T1 - Tribological tests to simulate wear on piston rings N2 - In order to reduce experimental effort, tribological tests are performed for coating selection, simulating the friction, wear and scuffing behaviour between the piston ring and cylinder liner, as well as lubricant evaluation. The creation of test standards in piston ring/cylinder liner simulation is discussed. PVD coatings, HVOF coatings and nitriding treatments have been applied to piston rings as alternative for chromium coatings. CrN/TiN coating seems very effective for increasing the wear and scuffing resistance. Biodegradable engine oils based on esters and polyglycols reduce friction and exceed the wear resistance of reference engine oils based on hydrocarbons for the new generation engines with high cylinder pressures. KW - Friction KW - HVOF KW - Chromium KW - CrN/TiN KW - Scuffing KW - Wear KW - Resistance KW - Tribo-system KW - Piston ring KW - Cylinder liner KW - SRV Test KW - Schwingung KW - Reibung KW - Verschleiß KW - Oscillation KW - Friction and Wear KW - Extreme pressure test KW - Coating KW - Physical vapour deposited coating (PVD) KW - High Pressure–High Velocity Oxi-fuel coating (HP-HVOF) KW - Friction coefficient KW - Wear scar KW - Lubricant KW - Bio-degradable lubricant KW - Ester KW - Glycol KW - Viscosity index KW - Viscosity grade KW - Thematic piston ring PY - 2011 SN - 978-0-470-82882-3 DO - https://doi.org/10.1002/9780470828847.ch11 IS - Chapter 11 SP - 167 EP - 195 PB - John Wiley & Sons AN - OPUS4-26253 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Woydt, Mathias T1 - International Standardisation of the SRV-Testing-Techniques T2 - Tokyo Univeristy of Science CY - Tokyo, Japan DA - 2013-02-12 PY - 2013 AN - OPUS4-27718 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Woydt, Mathias T1 - Biolubes - Legal situation and trends T2 - Seminar on eco-friendly and highly loaded tribosystems CY - Tokyo, Japan DA - 2013-02-13 PY - 2013 AN - OPUS4-27714 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Woydt, Mathias T1 - Slip-rolling tests of KYB DLC coatings T2 - Seminar on eco-friendly and highly loaded tribosystems CY - Tokyo, Japan DA - 2013-02-13 PY - 2013 AN - OPUS4-27716 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Woydt, Mathias T1 - Dry sliding couples with nearly zero wear - DLC vs. different ceramics T2 - Seminar on eco-friendly and highly loaded tribosystems CY - Tokyo, Japan DA - 2013-02-13 PY - 2013 AN - OPUS4-27717 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Woydt, Mathias T1 - STRIBECK-type curves of grey cast iron and AlSi17Cu3 liners T2 - Tribologie-Fachtagung 2012 CY - Göttingen, Germany DA - 2012-09-24 PY - 2012 AN - OPUS4-26553 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Woydt, Mathias T1 - Friction reduction in engines and powertrains by polyglycols and/or alternative steels and/or thin films T2 - SAE 2012 Fall Powertrain Conf. CY - Malmö, Sweden DA - 2012-09-18 PY - 2012 AN - OPUS4-26509 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Kovalev, Alexander A1 - Hartelt, Manfred A1 - Spaltmann, Dirk A1 - Wäsche, Rolf A1 - Woydt, Mathias T1 - Zero wear (Null Verschleiß) N2 - 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. N2 - Recent developments in contact mechanics and microfribology have shown that it is very important to study surface modification effects for quantification of „Zero wear“ (plastic deformation of upper parts of asperities) during sliding friction. The present work considers experimental and Simulation data on the Formation of elastic and plastic contact areas during sliding friction on rough surfaces. The Simulation of discrete contact was carried out using as a source the AFMimages of real surface topography at micro/nanoscale. The approach for quantification of „zero wear“, proposed here, is not using common Statistical Parameters of roughness, but it considers contact areas on asperities. In these areas some regions are undergoing plastic deformation which influences surface Transformation during sliding friction. Also, the workhardening effect was taken into account in the Simulation of sliding friction. This enabled a rnore successful fit of experimental data. The results obtained of the Computer simulations will provide a way of studying friction force at the initial stage of the running-in process. T2 - 53. Tribologie-Fachtagung - Reibung, Schmierung und Verschleiß CY - Göttingen, Germany DA - 24.09.2012 PY - 2012 SN - 978-3-00-039201-6 VL - II SP - 43/1 EP - 43/13 CY - Aachen AN - OPUS4-26640 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Woydt, Mathias T1 - Localized hardening and structuring of steel by simples process T2 - Tribologie-Fachtagung 2012 CY - Göttingen, Germany DA - 2012-09-24 PY - 2012 AN - OPUS4-26579 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Woydt, Mathias T1 - Tribo-talk: Mineralöl - ein Auslaufmodell T2 - Tribologie-Fachtagung 2012 CY - Göttingen, Germany DA - 2012-09-24 PY - 2012 AN - OPUS4-26574 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Woydt, Mathias T1 - Keynote: Polyglycol-based engine-oils - Has industry to adapt to this lubricant class? T2 - 5. World Tribology Congress CY - Turin, Italy DA - 2013-09-08 PY - 2013 AN - OPUS4-28902 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Woydt, Mathias T1 - Tribological Profile of Binderless and Cobalt Bonded Niobium Carbide N2 - The tribological profile of alumina (99.7%) mated against rotating disks in two niobium carbide (NbC) grades were determined in unidirectional sliding tests (0.1 m/s to 7.5 m/s; 22°C and 400°C) as well as in oscillation tests (f= 20 Hz, δx= 0.2 mm, 2/50/98% rel. humidity, n= 106 cycles) under unlubricated (dry) conditions. In addition, the microstructure and mechanical properties of NbC were determined as well. The reason for testing hot-pressed NbC was to avoid side effects generated by sintering additives and/or second phases. The tribological data obtained were benchmarked with different ceramics, cermets and thermally sprayed coatings. NbC exhibited low wear rates under dry sliding associated with high load carrying capacity. The tribological profile established revealed a strong position of NbC under tribological considerations and for closed tribo-systems against traditional references, such as WC, Cr3C2, (Ti,Mo)(C,N), etc. T2 - EURO PM2013 Congress & Exhibition CY - Gothenburg, Sweden DA - 15.09.2013 PY - 2013 AN - OPUS4-29079 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Scholz, Christian A1 - Woydt, Mathias T1 - The influence of high toughness silicon steels on applications demanding low friction and high load carrying capacity N2 - Highly concentrated or loaded contacts in powertrain and gear applications offer significant weight savings in C02 emissions. Today, thin film coatings, alternative base oils and new additives are populär as working fields and strategies of OEMs to realize low friction tribosystems. Especially the automotive industry anticipates environmental and performance benefits in applying light-weight construction of mechanical parts, for instance in gears and engines. Light-weight strategies increase the contact stresses above 2.14 GPa (or FZG load stage 14) due to the reduction of component sizes. These demands directly raise questions about the suitability of the most promising technical solution. Alternative steels with improved mechanical properties, i.e. toughness values, which offer low coefficients of friction, optimal resistance to high contact pressure and potential to apply low friction surface coatings representing a valid alternative to conventional gear steels. Traditional bearing and gear steels, such as 100Cr6 (SAE E52100) or 16MnCr5 (1.7131) have reached their mechanical limits at contact pressures above FZG load stage 14. T2 - WTC 2013 - 5th World tribology congress CY - Torino, Italy DA - 08.09.2013 KW - Slip-rolling KW - Silicon steel KW - DLC KW - High load KW - Gear steel PY - 2013 SP - 1 EP - 4 AN - OPUS4-29092 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Woydt, Mathias A1 - Mohrbacher, H. T1 - Friction and wear of binder-less niobium carbide N2 - The tribological profile of alumina (99.7%) mated against binder-less niobium carbide (NbC) rotating disks were determined unidirectional sliding tests (0.1–7.5 m/s; 22 °C and 400 °C) as well as in oscillation tests (f=20 Hz, Δx=0.2 mm, 2/50/98% rel. humidity, n=105/106 cycles) under un-lubricated (dry) conditions. In addition, the microstructure and mechanical properties of NbC were determined as well. The reason for testing hot-pressed NbC was to avoid side effects generated by sintering additives and/or second phases. The tribological data obtained were benchmarked with different ceramics, cermets and thermally sprayed coatings. NbC exhibited low wear rates under dry sliding associated with high load carrying capacity. The tribological profile established revealed a strong position of NbC under tribological considerations and for closed tribo-systems against traditional references, such as WC, Cr3C2, (Ti,Mo)(C,N), etc. KW - Sliding friction KW - Sliding wear KW - Ceramic KW - Coating KW - NbC PY - 2013 DO - https://doi.org/10.1016/j.wear.2013.07.013 SN - 0043-1648 VL - 306 IS - 1-2 SP - 126 EP - 130 PB - Elsevier B.V. CY - Amsterdam AN - OPUS4-28985 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Kovalev, Alexander A1 - Hartelt, Manfred A1 - Spaltmann, Dirk A1 - Wäsche, Rolf A1 - Woydt, Mathias T1 - Zero wear (Null Verschleiß) KW - Reibung KW - Null-Verschleiß KW - Rauhigkeit KW - Kontaktmechanik KW - Modellierung KW - DLC KW - Friction KW - Zero-wear KW - Roughness KW - Contact mechanics KW - Simulation PY - 2013 SN - 0724-3472 VL - 60 IS - 2 SP - 5 EP - 12 PB - Expert Verlag CY - Renningen AN - OPUS4-28979 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Woydt, Mathias T1 - Tribological profile of binderless and cobalt bonded niobium carbide N2 - The tribological profile of alumina (99.7%) mated against rotating disks in two niobium Carbide (NbC) grades were determined in unidirectional sliding tests (0.1 m/s to 7.5 m/s; 22°C and 400°C) as well as in oscillation tests (f= 20 Hz, Ax= 0.2 mm, 2/50/98% rel. humidity, n= 1062 c* y*c *l es) under unlubricated (dry) conditions. In addition, the microstructure and mechanical properties of NbC were determined as well. The reason for testing hot-pressed NbC was to avoid side effects generated by sintering additives and/or second phases. The tribological data obtained were benchmarked with different ceramics, cermets and thermally sprayed coatings. NbC exhibited low wear rates under dry sliding associated with high load carrying capacity. The tribological profile established revealed a strong Position of NbC under tribological considerations and for closed tribo-systems against traditional references, such as WC, Cr3C2, (Ti,Mo)(C,N), etc.. T2 - Euro PM2013 Congress & Exhibition CY - Gothenburg, Sweden DA - 15.09.2013 KW - Sliding friction KW - Sliding wear KW - Oscillation KW - Ceramic KW - Coating KW - NbC KW - Cobalt PY - 2013 SN - 978-1-899072-40-8 SP - 1 EP - 7 AN - OPUS4-29141 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Woydt, Mathias T1 - The ways/paths to low friction, low wear and high load carrying capacities in gear and engines T2 - 7. Asia-Pacific Base Oil, Lubricant & Grease Conference CY - Bangkok, Thailand DA - 2013-03-11 PY - 2013 AN - OPUS4-27801 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Woydt, Mathias T1 - Reibverhalten alternativer Stähle und dünner kohlenstoffhaltiger Beschichtungen - ein Gleit-Roll-Benchmark T2 - OilDoc Conference & Exhibition. Lubricants Maintenance Tribology CY - Rosenheim, Germany DA - 2013-01-22 PY - 2013 AN - OPUS4-27609 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Woydt, Mathias T1 - Tribologie des céramiques N2 - Les ceramiques modernes sont differentes des ceramiques traditionnelles (carrelage, materiaux de construction, porcelaine); on les distingue par des adjectifs tels que « techniques », « industrielles » ou « thermomecaniques ». Les ceramiques industrielles sont caracterisees par leur caractere refractaire marque et de grandes duretes. Leur mediocre tenacite explique leur sensibilite ä la presence de defauts, d'oü leur reputation d'etre peu resistantes et cassantes. Les ceramiques techniques sont utilisees pour: • leurs proprietes electriques ou dielectriques; • leurs proprietes magnetiques et de supraconducteurs ; • leurs proprietes optiques; • leurs proprietes chimiques; • leurs proprietes biologiques; • leurs proprietes nucleaires. En outre, eiles sont employees pour leurs proprietes mecaniques, thermomecaniques et tribologiques, ainsi que pour leur tenue face ä la corrosion. Nous allons nous concentrer sur leur comportement tribologique. PY - 2013 N1 - Serientitel: Les sélections - Techniques de l'ingénieur – Series title: Les sélections - Techniques de l'ingénieur SP - TRI 4 550-1 EP - TRI 4 550-14 CY - Paris AN - OPUS4-28146 LA - fra AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Woydt, Mathias T1 - Tribological Profile of Binderless Niobium Carbide T2 - International Conference on Refractory Metals and Hard Materials CY - Reutte, Austria DA - 2013-06-03 PY - 2013 AN - OPUS4-28626 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Woydt, Mathias T1 - The potential of 36NiCrMo1-5-7 steel in applications demanding low slip rolling resistance and high load carrying capacity T2 - 2. International Symposium on Nb and Mo alloying in high performance steels CY - Jeju Island, South Korea DA - 2013-04-24 PY - 2013 AN - OPUS4-28270 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Woydt, Mathias T1 - Friction reduction in powertrains by polyglycols, alternative steels, alternative additives and/or thin films T2 - 68. Annual Meeting & Exhibition, Society of Tribologists and Lubrication Engineers CY - Detroit, MI, USA DA - 2013-05-05 PY - 2013 AN - OPUS4-28435 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Woydt, Mathias T1 - Friction and wear of binderless niobium carbide T2 - 68. Annual Meeting & Exhibition, Society of Tribologists and Lubrication Engineers CY - Detroit, MI, USA DA - 2013-05-05 PY - 2013 AN - OPUS4-28436 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Nakase, Takuya A1 - Woydt, Mathias A1 - Kato, S. A1 - Sasaki, S. T1 - Tribological properties of aluminium alloys in environmentally acceptable hydraulic fluids N2 - Umweltregularien schreiben, global gesehen, mehr und mehr umweltfreundliche Schmierstoffe (EAL – Environmental Acceptable Lubricants) auf Basis von Estern oder Polyglykolen vor. Die Kompatibilität von diesen Schmierstoffen mit den verwendeten Tribomaterialien in hydraulischen Systemen, wie beispielsweise gleitende Bauteile und Öldichtungen, sollte dabei genauer betrachtet werden. Im Leichtbau werden häufig Aluminium-Legierungen für Bauteile mit Gleitkontakten in Hydrauliksystemen eingesetzt. Dafür ist es notwendig, die Oberflächenbeschaffenheit der eingesetzten Materialen positiv zu beeinflussen, um die reduzierte Verschleißbeständigkeit im Misch- und Grenzreibungsbereich des Aluminiums zu verbessern. Die Legierung AA6061, sowohl unbeschichtet als auch mit Konversionsschichten versehen, und eine alternative AlFeXY Legierung (unbeschichtet) wurden im Misch- und Grenzreibungsbereich auf einem Laborprüfstand für kontinuierliches Gleiten (Zylinder-Ebene-Kontakt) unter der Verwendung von kommerziell erhältlichen EALs bei 80°C gegen 100Cr6 untersucht. Diese Testkampagne zeigte, daß geeignete Werkstoffkombinationen und kommerziell verfügbare EALs das Potential haben, sich mit dem konventionellen Werkstoff- und Schmierstoffpaarungen unter Misch- und Grenzreibungsbedingungen zu N2 - Environmental legislations prescribe globally more and more environmentally acceptable lubricants (EALs), based on esters and polyglycols. The compatibility of EALs with tribo-materials used in hydraulic System such sliding parts and oil seals needs to be considered. Aluminium alloys are widely used as lightweight material for sliding parts in many applications. It is necessary to provide optimized design on its surface because of the inferior wear resistance under mixed/ boundary lubrication. The AA6061 alloy (uncoated and coated by different conversion coatings) and an alternative AI-Fe-XY alloy (uncoated) were tested by a continuous sliding test (cylinder-on-disk) under mixed/boundary lubrication with commercially available EALs at 80°C against 100Cr6 Steel. Appropriate combinations of aluminium alloys (coated or uncoated) and commercially available EALs have the potential to compete with conventional tribo-system like steel/steel lubricated with mineral hydraulic fluids under mixed/boundary lubrication. T2 - 54. Tribologie-Fachtagung - Reibung, Schmierung und Verschleiß - Forschung und praktische Anwendungen CY - Göttingen, Germany DA - 30.09.2013 PY - 2013 SN - 978-3-00-022603-8 VL - I IS - Paper 7 SP - 7/1 EP - 7/11 AN - OPUS4-29460 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Woydt, Mathias A1 - Mohrbacher, H. T1 - Tribological profile of binderless niobium carbide N2 - The tribological profile of alumina (99,7%) mated against binderless niobium Carbide (NbC) rotating disks under under unlubricated (dry) friction and the type of motions of unidirectional sliding (0.1 m/s to 7.5 m/s; 22°C and 400°C) and oscillation (f= 20 Hz, Ax= 200 mm, 2/50/98% rel. humidity, n= 105/106 cycles) was determined including the microstructure and mechanical properties. The obtained tribological data were benchmarked with different ceramics, cermets and thermally sprayed coatings. The established tribological profile revealed a strong position of NbC under tribological considerations and for closed tribosystems against traditional references, like WC, Ci‘3C2, (Ti,Mo)(C,N), etc.. T2 - 37th International Conference on Advanced Ceramics and Composites CY - Daytona Beach, FL, USA DA - 27.01.2013 PY - 2013 SN - 978-1-118-83995-9 SP - Datei 01/20 reviewed, 5 pages PB - Wiley AN - OPUS4-29461 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Woydt, Mathias T1 - Tribological Profile of Binderless Niobium Carbide, Niobium Oxide and Cemented NbC T2 - Materials Science & Technology 2013 CY - Montreal, Canada DA - 2013-10-27 PY - 2013 AN - OPUS4-29388 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Woydt, Mathias T1 - Tribological Couples with Nearly Zero Wear T2 - Materials Science & Technology 2013 CY - Montreal, Canada DA - 2013-10-27 PY - 2013 AN - OPUS4-29389 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Woydt, Mathias T1 - Tribological Profile of Binderless Nobium Carbide T2 - 37th International Conference on Advanced Ceramics and Composites CY - Daytona Beach, FL, USA DA - 2013-01-27 PY - 2013 AN - OPUS4-29393 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Woydt, Mathias T1 - Influence des conditions d'essais sur les données tribologiques N2 - Plusieurs essais coopératifs multilaboratoires ont été effectués en 1997, 1998, 1999, 2000 et 2001 par le groupe de travail DIN 51834 Essais tribologiques dans l'appareil translation-oscillation. Il s'agit d'essais effectués sur des machines différentes et dans différents lieux. Pour simplifier, on les dénomme essais circulaires. L'analyse statistique des résultats a examiné l'influence du choix du solvant, du modèle de l'appareil et des paramètres sur les caractéristiques tribologiques des différentes huiles. Le coefficient de frottement et les taux d'usure peuvent être classés selon les dix différents solvants utilisés: l'isopropanol donne des coefficients de frottement plutôt bas et l'isoparaffine des coefficients plutôt élevés. La variation du coefficient de frottement selon le modèle de machine se situe entre 0,2 % et 0,9 % et les taux d'usure ne sont pas non plus affectés par les solvants. Le diamètre de l'empreinte est insuffisant pour caractériser la résistance à l'usure d'une huile. Le critère pour l'adhésion a du être redéfini. La répétabilité et la reproductibilité ont été améliorées. PY - 2001 UR - http://cat.inist.fr/?aModele=afficheN&cpsidt=13446760 SN - 0032-6895 SN - 1778-3771 VL - 89 IS - 9-10 SP - 3 EP - 9 CY - Paris AN - OPUS4-1178 LA - fra AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Witke, Klaus A1 - Österle, Werner A1 - Skopp, André A1 - Woydt, Mathias T1 - Raman microprobe spectroscopy and transmission electron microscopy of thermal sprayed ZrO2 coatings before and after rub testing of outer air seals N2 - 8 wt% Y2O3-ZrO2 spray powder and thermally sprayed as thermal barrier coatings on outer air seals were characterized by Raman microprobe spectroscopy (RMS) and transmission electron microscopy to investigate the lateral distribution, composition, structure and grain size of ZrO2 phases and to separate ZrO2 and Y2O3. RMS of transfer layers on ZrO2-coated shrouds after rub tests against SiC laser-tipped metallic blades showed the formation of metallic oxides MeIMeII2O4 of spinel type. Wear tracks were partly covered by graphite and spinel-type oxides. In some cases, the latter were better detectable after laser enhanced cleaning by burning off the covering carbon layer. PY - 2001 DO - https://doi.org/10.1002/jrs.791 SN - 0377-0486 SN - 1097-4555 VL - 32 IS - 12 SP - 1008 EP - 1014 PB - Wiley CY - Chichester AN - OPUS4-1230 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Kloß, Heinz A1 - Woydt, Mathias ED - Bartz, Wilfried J. T1 - Predicition of the Tribological Performance of Sliding Systems T2 - 13th International Colloquium Tribology CY - Ostfildern, Germany DA - 2002-01-15 PY - 2002 SN - 3-924813-48-5 VL - 2 SP - 839 EP - 845 PB - Technische Akademie Esslingen CY - Ostfildern AN - OPUS4-1290 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Yarim, Rasim A1 - Wäsche, Rolf A1 - Woydt, Mathias ED - Franek, F. T1 - Wear Behaviour of SiC-TiC-TiB2 Ceramic Composites Sliding against SiC up to 800°C and 2m/s T2 - 2nd World Tribology Congress ; 2nd WTC 2001 CY - Vienna, Austria DA - 2001-09-03 KW - Dry sliding KW - Tribochemistry KW - Silicon carbide KW - Titanium carbide KW - Titanium boride KW - High temperature KW - Ceramic composites PY - 2001 SN - 3-901657-07-X SP - 1(?) EP - 4(?) PB - ÖTG CY - Wien AN - OPUS4-1438 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Binkowski, Sigrid A1 - Pahl, Regina A1 - Woydt, Mathias T1 - Vergleich der Präparationsverfahren an Gefügen keramischer Werkstoffe N2 - Der Artikel beschreibt verschiedene materialographische Präparationsverfahren und zeigt Aufnahmen von einer ganzen Reihe unterschiedlicher Keramiken, die mit verschiedenen Untersuchungsmethoden gemacht wurden. PY - 2002 UR - http://www.struers.com/resources/elements/12/3699/39art2_de.pdf IS - 39 SP - 8 EP - 19 PB - Struers CY - Willich AN - OPUS4-1471 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Woydt, Mathias A1 - Skopp, André A1 - Dörfel, Ilona A1 - Witke, Klaus T1 - Wear Engineering Oxides / Antiwear Oxides KW - Oxid KW - Hochtemperatur KW - Keramik KW - Reibung PY - 1999 SN - 1040-2004 SN - 1547-397X IS - 42,1 SP - 21 EP - 31 PB - Taylor & Francis CY - Philadelphia, Pa. AN - OPUS4-711 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Kloß, Heinz A1 - Woydt, Mathias A1 - Willmann, G. T1 - Temperaturberechnung an den Artikulationsflächen beim künstlichen Hüftgelenk KW - Hüftgelenkersatz KW - Aluminiumoxid KW - Zirkondioxid KW - Blitztemperatur KW - Tribologie KW - Oberflächentopographie PY - 2001 SN - 0933-5137 SN - 1521-4052 VL - 32 IS - 2 SP - 30 S. PB - Wiley-VCH Verl. CY - Weinheim AN - OPUS4-917 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - RPRT A1 - Woydt, Mathias A1 - Habig, Karl-Heinz T1 - Technisch-physikalische Grundlagen zum tribologischen Verhalten keramischer Werkstoffe – Literaturübersicht N2 - Darstellung der Anwendungen und Zukunftsperspektiven keramischer Werkstoffe zur Reibungs- und Verschleißminderung und Beschreibung der Beweggründe für den Einsatz von Keramik im High-Tech-Bereich sowie deren Wandel mit fortschreitendem Entwicklungsstand. Anschließend folgen Arbeiten, die sich mit der Reaktion keramischer Oberflächen auf statische und tribologische Gleitbeanspruchungen befassen. T3 - BAM Forschungsberichtreihe - 133 KW - Keramik KW - Siliziumkarbid KW - Siliziumnitrid KW - Zirkonoxid KW - Aluminiumtitanat KW - Aluminiumoxid KW - Rißbildung KW - Turbinenbau KW - Kreiskolbenmotor KW - Dichtleiste PY - 1988 UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-3173 SN - 978-3-88314-609-9 SN - 0938-5533 VL - 133 SP - 1 EP - 104 PB - Wirtschaftsverlag NW CY - Bremerhaven AN - OPUS4-317 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - RPRT A1 - Löffelbein, Bernd A1 - Woydt, Mathias A1 - Habig, Karl-Heinz T1 - Reibungs- und Verschleißuntersuchungen an Gleitpaarungen aus ingenieurkeramischen Werkstoffen in wäßrigen Lösungen N2 - Neben einer Literaturübersicht z. tribologischen Verhalten ingenieurkeramischer Werkstoffe in wässrigen Zwischenstoffen bzw. feuchter Umgebung werden Ergebnisse zum Reibungs- u. Verschleißverhalten von 6 kommerziellen keramischen Werkstoffen vorgestellt. T3 - BAM Forschungsberichtreihe - 186 PY - 1992 UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-2648 SN - 978-3-89429-21-1 SN - 0938-5533 VL - 186 SP - 1 EP - 86 PB - Wirtschaftsverlag NW CY - Bremerhaven AN - OPUS4-264 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - RPRT A1 - Schmidt, R. A1 - Klingenberg, G. A1 - Woydt, Mathias T1 - New lubrication concepts for environmental friendly machines N2 - The use of alternative oils for the lubrication of automobile engines has a potential of ecological and technical advantages. It requires the detailed knowledge of several thermophysical and viscometric properties in a large temperature range (mapping). Therefore, the following properties of up to twenty-eight different oils have been measured in the temperature range from 22 °C to 150 °C: density, heat capacity, thermal conductivity, viscosity at ambient pressure, viscosity under shear rates above 10 6 s-1, and the viscosity at elevated pressures (maximum 100 MPa). The last two have been measured with a substantially improved and a newly developed apparatus, respectively. The pressure- viscosity coefficient has been measured on four hydrocarbon-based, factory-fill oils, a paraffin oil and twenty-three alternative oils. Nine of the alternative oils are based partly or completely on esters, the other fourteen on polyglycols, two of them additionally on water. T3 - BAM Forschungsberichtreihe - 277 KW - Polyglycol KW - Ester KW - PAG KW - PPG KW - Factory fill KW - Hydrocarbon KW - Bio-no-tox oils KW - Engine oil KW - Bio-oils KW - EAL KW - Eco-lubricants KW - Heat capacity PY - 2006 UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-1748 SN - 978-3-86509-528-3 SN - 0938-5533 VL - 277 SP - 1 EP - 59 PB - Wirtschaftsverlag NW CY - Bremerhaven AN - OPUS4-174 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - RPRT A1 - Effner, Ute A1 - Woydt, Mathias T1 - Wälzverschleiß und Endbearbeitung von Ingenieurkeramiken N2 - Keramische Werkstoffe haben auf Grund ihrer herausragenden tribologischen Eigenschaften in verschiedenen Bereichen der Produktion Anwendung gefunden und dadurch klassische Werkstoffe verdrängt. Gegenüber Matallen bieten sie bei Mangelschmierung sowohl unter Gleit- als auch grundsätzlich unter Wälz-beanspruchung Schutz vor adhäsivem Versagen. Hohe Herstellungskosten, bedingt bei der Endbearbeitung von Konturen mit verschiedenen und veränderlichen Radien, behindern die breite Marktdurchdringung. Mit der Modellverschleißprüfung - angelehnt an die DIN 50 324 - kann der bearbeitungsbedingte Einfluss auf das tribologische Verhalten unter Wälzreibung untersucht werden. T3 - BAM Forschungsberichtreihe - 237 PY - 2000 UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-2135 SN - 978-3-89701-520-X SN - 0938-5533 VL - 237 SP - 1 EP - 75 PB - Wirtschaftsverlag NW CY - Bremerhaven AN - OPUS4-213 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - RPRT A1 - Effner, Ute A1 - Woydt, Mathias T1 - Slip-Rolling and Machining of Engineering Ceramics N2 - Englische Übersetzung von BAM Forschungsbericht 237! Keramische Werkstoffe haben auf Grund ihrer herausragenden tribologischen Eigenschaften in verschiedenen Bereichen der Produktion Anwendung gefunden und dadurch klassische Werkstoffe verdrängt. Gegenüber Metallen bieten sie bei Mangelschmierung sowohl unter Gleit- als auch grundsätzlich unter Wälzbeanspruchung Schutz vor adhäsivem Versagen. Hohe Herstellungskosten, bedingt bei der Endbearbeitung von Konturen mit verschiedenen und veränderlichen Radien, behindern die breite Marktdurchdringung. Mit der Modellverschleißprüfung - angelehnt an die DIN 50 324 - kann der bearbeitungsbedingte Einfluss auf das tribologische Verhalten unter Wälzreibung untersucht werden. T3 - BAM Forschungsberichtreihe - 259 PY - 2003 UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-1928 SN - 978-3-89701-976-0 SN - 0938-5533 VL - 259 SP - 1 EP - 68 PB - Wirtschaftsverlag NW CY - Bremerhaven AN - OPUS4-192 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Wäsche, Rolf A1 - Woydt, Mathias A1 - Rehmer, Birgit ED - Ewsuk, K. ED - Naito, M. ED - Kakeshita, T. ED - Kirihara, S. ED - Uematsu, K. ED - Abe, H. T1 - Characterization of the tribological interface in low wear Magneli type ceramics N2 - 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. T2 - 3rd International conference on characterization and control of interfaces for high quality advanced materials CY - Kurashiki, Japan DA - 2009-09-06 PY - 2009 SN - 978-0-470-90917-1 VL - 219 SP - 111 EP - 116 PB - John Wiley & Sons CY - Hoboken, New Jersey, USA AN - OPUS4-21842 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Tamura, T. A1 - Hosohata, S. A1 - Nakase, T. A1 - Kato, S. A1 - Scholz, Christian A1 - Woydt, Mathias T1 - High wear resistance DLC film under high pressure contact N2 - Diamond-like Carbon (DLC) is a hard film composed primarily of carbon and possessed amorphous structure. It is known to have superior tribological properties such as low friction, high wear resistance and anti-seizure. In addition, DLC film is now widely used in a various industrial application due to improvements in its adhesive property. This paper shows the DLC film with sputtering method has the durability under high pressure contact. T2 - 12. Machine design and tribology division meeting in JSME CY - Ehime-ken, Japan DA - 23.04.2012 KW - Diamond-like carbon KW - Slip-rolling test PY - 2012 SN - 1348-3919 N1 - Sprachen: Japanisch/Englisch - Languages: Japanese/English VL - 12-14 SP - 101 EP - 102 AN - OPUS4-25923 LA - mul AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Scholz, Christian A1 - Spaltmann, Dirk A1 - Woydt, Mathias T1 - Höchstbelastbare Wälzkontakte mit geringer Misch-/Grenzreibungszahl N2 - Leichtbaustrategien im Antriebsstrang erhöhen durch Downsizing die Hertz'schen Kontaktpressungen und die mechanischen Lasten. Dadurch müssen neben wälzbeständigen Stählen auch dazu passende reibungsmindernde Konzepte gefunden werden. In der vorliegenden Arbeit wurden alternative, hoch zähe Stähle mit einer Wälzbeständigkeit bis P0max = 4,2 GPa untersucht, welche mit geeigneten Grundöl- und Additivkombinationen die Reibungszahlen herunter auf 0,025 reduzieren konnten. Diese alternativen Stahllegierungen erlauben nicht nur an der Zahnflanke sehr hohe Kontaktpressungen, sie bieten außerdem entsprechende Zähigkeits- und Festigkeitseigenschaften für den Zahnfuß. In vorangegangenen Untersuchungen wurde eine Vielzahl verschiedener Dünnschichten auf ihre Überrollbeständigkeit unter Extrembeanspruchungen validiert. Allerdings zeigte sich bei den meisten Dünnschichten ein Qualitätsunterschied von Charge zu Charge. Unter Verwendung verschiedener organischer, metallorganischer und anorganischer Additive konnten, sich daran anschließende Versuche, vielversprechende Ergebnisse erzielt werden. Sämtliche Versuche unter extremen Beanspruchungen wurden bei+120 °C Öltemperatur auf Zwei-Scheiben-Tribometern vom Typ AMSLER und 2Disk von Optimol Instruments unter Misch-/Grenzreibungsbedingungen durchgeführt und die tribologischen Eigenschaften der neuartigen, unbeschichteten Stähle und in Relation zu leistungsstarken DLC-/ZrCN Dünnschichten gesetzt KW - Hochzähe Stähle KW - Getriebekomponenten KW - DLC KW - ZrCN KW - Extrembeanspruchung KW - Dünnschichten KW - Polyglykole KW - Additive KW - Slip-rolling KW - High toughness steels KW - High pressure KW - Thin film coatings KW - Polyglycols KW - Additives PY - 2012 SN - 0724-3472 VL - 59 IS - 3 SP - 41 EP - 47 PB - Expert Verlag CY - Renningen AN - OPUS4-26232 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Scholz, Christian A1 - Tamura, T. A1 - Hosohata, S. A1 - Nakase, T. A1 - Kato, S. A1 - Woydt, Mathias T1 - Null-Verschleiß an Hochleistungs-DLC-Schichten N2 - Die Wälzbeständigkeit und das Potential zur Reibungsminimierung von Hochleistungsdünnschichten wurden bereits in einer Vielzahl von Untersuchungen dargestellt. Insbesondere a-C:H Schichtsysteme konnten hierbei hervorragende Testresultate bei Hertzschen Kontaktpressungen bis zu Pomax = 4,2 GPa (Fn= 5 kN) im geschmierten Zustand bei 120°C Öltemperatur vorweisen. In der vorliegenden Arbeit konnte anhand von, bereits in der Industrie erfolgreich angewendeten, DLC-Hochleistungsdünnschichten in Überrollversuchen auf Zwei-Scheiben-Prüfständen zusätzlich sehr niedrige Verschleißkoeffizienten nachgewiesen werden. Bei der topografischen Untersuchung der Beschichtungen nach Versuchen wurden Verschleißkoeffizienten unterhalb von 10'10 mm3/Nm festgestellt. Die Versuche dazu wurden auf zwei verschiedenen Zwei-Scheiben-Tribometern (Amsler und Optimol Instruments) unter Hertzschen Kontaktpressungen von bis zu Pomax = 3,75 GPa (Fn = 4.400 N) bei 120°C Öltemperatur durchgeführt. Als industriell prozesssicheres Stoffsystem mit Null-Verschleiß Eigenschaften im geschmierten Reibungszustand unter Extrembedingungen bieten diese PVD-Schichten ein hohes Potential Anwendung im Zuge von Leichtbaustrategien im PKW-Bereich und anderen industriellen Applikationen zu finden. Die Oberflächen der Beschichtungen wurden hinsichtlich ihrer Topographie mittels taktiler Messtechnik und AFM untersucht. T2 - 53. Tribologie-Fachtagung - Reibung, Schmierung und Verschleiß CY - Göttingen, Germany DA - 24.09.2012 KW - Null-Verschleiß KW - DLC KW - Extrembeanspruchung KW - Dünnschichten PY - 2012 SN - 978-3-00-039201-6 SP - 44/1 EP - 44/15 CY - Aachen AN - OPUS4-26686 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Manier, Charles-Alix A1 - Spaltmann, Dirk A1 - Theiler, Geraldine A1 - Woydt, Mathias T1 - Carboneous coatings by rolling with 10% slip under mixed/boundary lubrication and high initial Hertzian contact pressures N2 - Costs reduction is one of the major objectives in mechanical applications with a parallel increase of the power output. Another driver represents new environmental standards and their increasing restrictions in the automotive industry leading to the question, if materials based concepts may substitute harmful EP/AW additives in lubricants. This paper presents the slip-rolling resistance of different DLC/THC coatings on steel substrates with a definite slip rate of 10%. Industrial DLC coatings of ta-C and a-C:H types from various manufacturers were deposited on steels SAE 52100 and AMS 5898 to compile the slip-rolling resistance under initial average Hertzian contact pressures between 1.5 GPa and 2 GPa. The tests were carried out on Amsler-type twin disc tribometer under the regime of mixed/boundary lubrication in unadditivated paraffinic oil (ISO VG 46) and a factory fill engine oil. The spherical steel sample was uncoated and the cylindrical coated with DLC. Some coatings achieved 10 million cycles without any damage under a maximal Hertzian contact pressure Pmax well over 2.25 GPa, thus exceeding FZG 12. KW - DLC KW - Rolling KW - Mixed/boundary lubrication KW - Hertzian pressure PY - 2008 DO - https://doi.org/10.1016/j.diamond.2008.01.066 SN - 0925-9635 VL - 17 IS - 7-10 SP - 1751 EP - 1754 PB - Elsevier CY - New York, NY AN - OPUS4-17816 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Manier, Charles-Alix A1 - Theiler, Geraldine A1 - Woydt, Mathias A1 - Ziegele, H. ED - Richard, C. ED - Bigerelle, M. ED - Mazeran, P.-E. ED - Bonis, M. T1 - Couches minces pour contacts lubrifies sous sollicitation en slip-rolling (glissement-roulement) et haute pression hertzienne initiale de contact T2 - Conception, fabrication et durabilité (JIFT 2009) CY - Compiègne, France DA - 2009-05-05 KW - Thin film coatings KW - DLC KW - Zr(CN) KW - ta-C KW - Slip-rolling KW - Mixed lubrication PY - 2012 SN - 978-2-911256-80-6 SP - 211 EP - 223 PB - TRANSVALOR - Presses des Mines AN - OPUS4-26011 LA - fra AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Spaltmann, Dirk A1 - Manier, Charles-Alix A1 - Theiler, Geraldine A1 - Proß, E. A1 - Ziegele, H. A1 - Kursawe, S. A1 - Woydt, Mathias T1 - Überrollbeständige Dünnschichten unter geschmierter Wälzreibung bis 3.500 MPa KW - DLC KW - Kohlenstoff Wälzen KW - Schlupf KW - Schmierung KW - Temperatur KW - Pressung PY - 2008 SN - 0724-3472 VL - 55 IS - 4 SP - 22 EP - 27 PB - Expert Verlag CY - Renningen AN - OPUS4-18029 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Igartua, A. A1 - Fdez-Pérez, X. A1 - Illarramendi, I. A1 - Luther, R. A1 - Rausch, J. A1 - Woydt, Mathias ED - Carmo, J. P. ED - Ribeiro, J. E. T1 - Biolubricants and triboreactive materials for automotive applications N2 - The text deals with passenger car motor oils (PCMO) with reduced metal-organic additives. KW - Biolubricants KW - Passenger car motor oils (PCMO) KW - Automotive KW - Tribology PY - 2012 UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-464317 SN - 978-9-53510-698-2 DO - https://doi.org/10.5772/46852 SP - 119 EP - 146 PB - INTECH CY - Rijeka, Croatia AN - OPUS4-46431 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Manier, Charles-Alix A1 - Theiler, Geraldine A1 - Spaltmann, Dirk A1 - Woydt, Mathias A1 - Proß, E. A1 - Ziegele, H. T1 - Couches minces pour les contacts lubrifiés en slip-rolling (glissement-roulement) sous haute pression hertzienne initiale N2 - Le secteur automobile doit faire face actuellement à de nouveaux challenges au niveau de la construction allégée, des économies de carburant et des coûts. Ces exigences motivent la mise au point de tribosystèmes pouvant résister à des pressions de contact de plus en plus élevées avec de faibles coefficients de frottement. L'optimisation de systèmes existants par l'application de revêtements de surface performants représente une alternative intéressante. Ce texte présente les performances de couches minces dans des conditions d'essais de slip-rolling (roulement à composante de glissement) en présence de lubrifiants liquides. Après une première sélection à température ambiante, les revêtements les plus performants ont été testés à 120 °C. Il s'agit de revêtements DLC en carbone hydrogéné (a-C:H) et en carbone tétraédrique (ta-C) de dernières générations ainsi qu'un nouveau système « revêtement/substrat ». Certains des revêtements DLC développés récemment sont résistants en slip-rolling au moins jusq'’à 10 millions de cycles à 120 °C dans l'huile moteur sous des pressions hertziennes de contact de P0max = 2600 / 2940 MPa. De plus, le nouveau système revêtement Zr(C,N)x/substrat peut résister au moins à 1 million de cycles sous des pressions hertziennes initiales de contact allant jusqu'à P0max = 3500 MPa et à des températures de lubrifiant d'au moins 120 °C. ----------------------------------------------------------------------------------------------------------------------------------------------- The light-weight approach and fuel economy targets in today's automotive engineering require tribosystems, which can withstand higher contact pressures associated with low coefficients of friction. The application of surface coatings represents one approach among others. This paper presents thin film coatings performances in a bench mark test procedure exerting slip-rolling conditions in the presence of liquid lubricants. After a first selection at room temperature, the most resistant coatings were evaluated at 120 °C. These are newly developed DLC coatings (a-C:H & ta-C) as well as a novel coating-substrate system. Some of the newly developed DLC-coatings are slip-rolling resistant for at least up to 10 million cycles at 120 °C oil temperature) under Hertzian contact pressures of P0max = 2600 / 2940 MPa. Furthermore, this novel Zr-based thin film coating can withstand at least 1 million cycles under initial Hertzian contact pressures of up to P0max = 3500 MPa and oil temperatures of at least 120 °C associated with low coefficients of friction under mixed/boundary conditions. KW - Thin film coatings KW - DLC KW - Zr(CN) KW - ta-C KW - Slip-rolling KW - Mixed lubrication KW - Couches minces KW - Lubrification mixte PY - 2009 DO - https://doi.org/10.1051/mattech/2009051 SN - 0032-6895 SN - 1778-3771 VL - 97 IS - 6 SP - 397 EP - 409 CY - Paris AN - OPUS4-31747 LA - fra AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Woydt, Mathias T1 - Überrollbeständige Dünnschichten unter geschmierter Wälzreibung bis 3.500 MPa N2 - Die Wälzbeständigkeit von Kohlenstoffdünnschichten (DLC, Diamond Like Carbon) ist im Lauf den letzten Jahren wesentlich verbessert worden. Gleichwohl sind weitere Leistungssteigerungen nötig besonders bezüglich der Temperaturbeständigkeit und der prozessbedingten Oberflächenrauheit der abgeschiedenen Schichten. Dieser Beitrag stellt ein neuartiges Schicht-Substrat-System vor. Dieses ist mit unlängst entwickelten DLC-Dünnschichten unter geschmierter Wälzbeanspruchung in einem Benchmark verglichen worden. Eine der zirkonium-basierten Dünnschichten erweist sich als wälzbeanspruchbar und -beständig unter hohen anfänglichen Hertzsche Pressungen bis P0max = 3.500 MPa und offenbarte in einem Erstbefüllungsmotoröl bei 120°C auch geringe Misch-/Grenzreibungszahlen. Als Vergleich erreichen die DLC Schichten 10 Millionen Zyklen bei RT bis maximalen Hertzsche Pressungen von P0max = 2.940 MPa. Einige DLC-Schichten erzielen diese hohe Belastbarkeit auch bei 120°C. Die Zr-basierten Dünnschichten erfordern keine darauf angepaßten Schmierstoffformulierungen. Diese nanostrukturierten Dünnschichten beruhen auf einer Architektur und einem Prozess, die sich zusammen für die Großserie eignen. T2 - 49. Jahrestagung der Gesellschaft für Tribologie CY - Göttingen, Germany DA - 2008-09-22 PY - 2008 AN - OPUS4-18195 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Spaltmann, Dirk A1 - Manier, Charles-Alix A1 - Theiler, Geraldine A1 - Proß, E. A1 - Ziegele, H. A1 - Kursawe, S. A1 - Woydt, Mathias T1 - Überrollbeständige Dünnschichten unter geschmierter Wälzreibung bis 3.500 MPa T2 - 49. Tribologie-Fachtagung - Reibung, Schmierung und Verschleiß - Forschung und praktische Anwendungen CY - Göttingen, Deutschland DA - 2008-09-22 KW - Thin film coating KW - Slip-rolling KW - DLC KW - ta-C KW - Zr(C,N) PY - 2008 SN - 978-3-00-025676-9 VL - I SP - 2/1 EP - 2/16 AN - OPUS4-31750 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Manier, Charles-Alix A1 - Theiler, Geraldine A1 - Spaltmann, Dirk A1 - Woydt, Mathias A1 - Ziegele, H. T1 - Benchmark of thin film coatings for lubricated slip-rolling contacts N2 - The light-weight approach and fuel economy targets in today's automotive engineering require tribosystems, which can withstand higher contact pressures associated with low coefficients of friction. The application of high-performance coatings represents one approach among others. This paper presents some recently developed DLC coatings (a-C:H and ta-C) as well as a novel coating-substrate system (Zr(C,N)) in a benchmark test procedure under slip-rolling conditions in the presence of liquid lubricants. Various coatings with different thickness, interlayer and substrates were evaluated for their slip-rolling resistance in different lubricants at ambient temperature and at 120 °C. Results indicate that some of these coating systems can withstand at least 10 million cycles under initial Hertzian contact pressures of up to Pmax = 3.500 MPa and oil temperatures of at least 120 °C associated with low coefficients of friction under mixed/boundary conditions. Surface of the coatings and the counter bodies were analysed and compared with untreated substrates. KW - Slip-rolling KW - DLC KW - Thin film coating KW - Zr(C,N) KW - Polyglycol PY - 2010 DO - https://doi.org/10.1016/j.wear.2010.02.020 SN - 0043-1648 VL - 268 IS - 11-12 SP - 1442 EP - 1454 PB - Elsevier CY - Amsterdam AN - OPUS4-21196 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Pimentel, A. S. O. A1 - Guesser, W. L. A1 - Portella, Pedro Dolabella A1 - Woydt, Mathias A1 - Burbank, J. T1 - Slip-rolling behavior of ductile and austempered ductile iron containing niobium or chromium N2 - The use of high niobium alloyed cast iron alloys is a relatively new approach in which the niobium addition intends to improve the properties of the material by the precipitation of hard niobium carbides during solidification. Steels can be replaced by ductile cast iron in some rolling applications, such as gears and cams, in order to reduce material costs. The aim of this work is to evaluate ductile iron alloyed with 1 weight percent (wt.%) niobium for the as cast specimens and with 1.8 wt.% and 2.4 wt.% niobium for the austempered specimens under lubricated slip-rolling tests using mixed/boundary conditions in an Amsler-type machine. Austempered ductile iron (ADI) alloyed with 1 wt.% chromium, or Carbidic ADI, was tested for comparison. For the as cast conditions, the niobium addition resulted in an increase of wear resistance owing to the low contact pressure of these tests. However, for the austempered specimens, the best performance was found for unalloyed ADI. The main factor acting in the initiation and propagation of cracks in ductile iron is the presence of the graphite nodules. The coarse carbides also contributed to the initiation of cracks and spalling of the material. KW - Ductile iron KW - Niobium alloying KW - Slip-rolling KW - Carbidic austempered ductile iron PY - 2019 DO - https://doi.org/10.1520/MPC20180188 SN - 2165-3992 SN - 2379-1365 VL - 8 IS - 1 SP - 402 EP - 418 PB - ASTM International CY - West Conshohocken, Pa. AN - OPUS4-51209 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Pimentel, A. S. O. A1 - Guesser, W. L. A1 - Custódio da Silva, W. J. R. A1 - Portella, Pedro Dolabella A1 - Woydt, Mathias A1 - Burbank, J. T1 - Abrasive wear behavior of austempered ductile iron with niobium additions N2 - Carbidic Austempered Ductile Iron (CADI) microstructures containing eutectic carbides can be produced by the addition of carbide stabilizing elements, such as chromium. Carbides formed from the addition of Cr are eutectic of M3C type. The presence of such hard phases can enhance the abrasion wear resistance of ductile iron. A new CADI can be produced by the addition of Nb. Niobium carbide particles are formed in the beginning of solidification and remain stable once they are insoluble in solid iron matrix. The dry sand abrasive wear resistance of ductile irons alloyed with 1.0, 1.8, and 2.4 wt% Nb were tested in both “as-cast” and “heat treated” conditions using standard ASTM G65. Results were compared to abrasive wear data obtained on ductile iron alloyed with 1 wt% Cr, CADI (1 wt% Cr), and the basic composition of iron without carbide stabilizing elements. In the “ascast” condition, the addition of Nb did not lead to a reduction in wear, while CADI with Nb is a promising substitute for CADI with Cr addition, because both materials showed very similar values of abrasion resistance. Micro-ploughing and micro-cutting mechanisms were observed on the worn surfaces of ductile irons. Abrasive wear resistance of these alloys was correlated with the volume fraction of carbides. KW - arbidic austempered ductile iron KW - Ductile iron KW - Niobium alloying KW - Abrasion PY - 2019 DO - https://doi.org/10.1016/j.wear.2019.203065 VL - 2019 IS - 440–441 SP - 203065 PB - Elsevier CY - Amsterdam, Niederlande AN - OPUS4-50784 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Girard, L. A1 - Tung, S. A1 - Woydt, Mathias A1 - Bachelder, D. ED - Totten, G. E. ED - Shah, J. S. ED - Forester, D. R. T1 - Automotive engine lubricants N2 - In 2003, ASTM Manual 37, Fuels and Lubricants Handbook: Technology, Properties, Performance and Testing, featured a chapter discussing automotive lubricants, including engine oils, automatic transmission fluids, manual transmission fluids, gear lubricants, and greases. This chapter, by Schwartz, Tung, and McMillan, surveyed all of these classes of lubricants, up to its publication in 2003. More recently, the period between 2003 and 2010 has been addressed as part of a book copublished by ASTM and SAE International (coeditors Simon Tung and George Totten), where Fox surveyed the development of engine oil specifications that emerged during those years. This chapter surveys the evolution of engine oil design and testing since 2002 and concludes with insights into future directions offered by recent tribological research. Our objective is to provide a reader new to the field with an understanding of the following: - Engine oil composition and formulation - North American engine oil specification development, and an outline of emergent European specifications - How emergent specifications and legislative requirements are linked to the introduction of new engine hardware - How tribological innovation can contribute to future enhancements in engine efficiency In parallel, we will provide several tables comparing groups of contemporaneous specifications. KW - Engine oil design KW - Engine oil testing PY - 2019 UR - https://www.astm.org/mnl3720160034.html SN - 978-0-8031-7089-6 SN - 978-0-8031-7090-2 DO - https://doi.org/10.1520/mnl3720160034 SP - 753 EP - 863 PB - ASTM International CY - West Conshohocken, PA ET - 2 AN - OPUS4-53977 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Wäsche, Rolf A1 - Sato, K. A1 - Brandt, Guido A1 - Schmid, Thomas A1 - Sasaki, S. A1 - Woydt, Mathias T1 - Wear behaviour of MgO stabilized zirconia in hot steam environment up to 400°C N2 - 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. KW - Hot steam KW - Zirconia KW - Friction KW - Wear KW - Tribofilm KW - Raman spectroscopy PY - 2019 DO - https://doi.org/10.1016/j.wear.2019.01.047 VL - 426-427 SP - 428 EP - 432 PB - Elsevier B.V. AN - OPUS4-47873 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Woydt, Mathias A1 - Huang, S. A1 - Cannizza, E. A1 - Vleugels, J. A1 - Mohrbacher, H. T1 - Niobium carbide for machining and wear protection - Evolution of properties N2 - The sales of niobium carbide (NbC) have grown in the last years, but NbC is still a hidden carbide and mainly used as grain growth inhibitor in hard metals. In the present work it was shown that the progress in the key properties, like HV30, KIC and strength, followed by machining and tribological results of the respective NbC grades. KW - Niobium carbide KW - Hard metals KW - Tribology PY - 2019 UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-485507 DO - https://doi.org/10.1016/j.mprp.2019.02.002 SN - 0026-0657 VL - 74 IS - 2 SP - 82 EP - 89 PB - Elsevier Ltd. AN - OPUS4-48550 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Woydt, Mathias T1 - Sub-stoichiometric oxides for wear resistance N2 - In the present work it was shown that the tribologcal profiles of special model oxides under dry unidirectional sliding have shown, that sub-oxides have a contribution to the tribological behavior of carbides and cermets, when they are tribo-oxidatively formed, because their tribological profiles as monolithic materials are homologous in part or totally, or compete with hardmetals or cermets, depending from the operating conditions regarded. KW - Sub-oxide KW - Friction KW - Wear KW - Carbide KW - Hardmetal PY - 2019 UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-498154 DO - https://doi.org/10.1016/j.wear.2019.203104 SN - 0043-1648 N1 - Eine identische Version zu diesem Artikel wurde publiziert unter: Wear 438-439 (2019) 102735, https://doi.org/10.1016/j.wear.2019.01.066 - An identical version to this article was published under: Wear 438-439 (2019) 102735, https://doi.org/10.1016/j.wear.2019.01.066 VL - 440-441 SP - 203104-1 EP - 203104-7 PB - Elsevier CY - Amsterdam AN - OPUS4-49815 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -