TY - CONF A1 - Gili, F. A1 - Igartua, A. A1 - Luther, R. A1 - Woydt, Mathias T1 - The impact of biofuels on engine oil's performance T2 - 17th International colloquium tribology - Solving friction and wear problems (Proceedings) T2 - 17th International colloquium tribology CY - Esslingen, Germany DA - 2010-01-19 KW - Lubricants KW - Engine oil KW - Additives KW - Bio-fuel KW - Ester KW - Polyglycol KW - Thin film coatings KW - Slip-rolling KW - DLC KW - Dilution KW - FAME KW - Jatropha KW - Rape seed KW - Stem valve KW - Piston ring PY - 2010 SP - 17_Woydt_Biofuels_Plenary, 1 EP - 13 AN - OPUS4-24832 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Spaltmann, Dirk A1 - von Gablenz, A. A1 - Woydt, Mathias T1 - CO2-neutral fuels and lubricants based on second generation oils such as Jatropha JF - Journal of ASTM International KW - 2nd generation bio-fuels KW - Jatropha KW - Lesquerella KW - VHOSO KW - SRV KW - Friction KW - Wear KW - HFRR KW - HTHS KW - Viscosity PY - 2010 SN - 1546-962X VL - 7 IS - 4 / Paper JAI102549 SP - 1 EP - 12 PB - American Society for Testing and Materials CY - West Conshohocken, Pa. AN - OPUS4-21297 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Scholz, Christian A1 - Manier, Charles-Alix A1 - Woydt, Mathias ED - de Wilde, W.P. ED - Brebbia, C.A. ED - Mander, U. T1 - Slip-rolling resistance of high performance thin films and high toughness steel substrates under extreme conditions T2 - High performance structures and materials V, WIT Transactions on The Built Environment N2 - Nowadays, diamond-like carbon (DLC) coatings are mainly used in many low loaded applications such as in machine tools, computer devices and many more. Especially the automotive industry anticipates a benefit in applying such coatings in association with the lightweight construction of mechanical parts, for instance in gear components. The ulterior motive is a global performance increase regarding environmental impact and power efficiency. In recent years, the slip-rolling resistance of DLC, a-C and ta-C thin film coatings was improved considerably. In view of the mechanical application of thin film coatings, there is still room for improvements. It was experimentally shown, that a-C and ta-C coatings can be slip-rolling resistant at room temperature in unaddivated paraffin oil up to ten million cycles under Hertzian contact pressures up to P0max = 2.9 GPa. Typically, the prime coated steel substrates were made of the hardened and tempered steels 100Cr6H and Cronidur 30. The aim of the work this to overtake these results, i.e. at higher maximum Hertzian pressures up to P0max = 4.2 GPa. Under such extreme conditions, it is necessary to choose special steels to avoid the failure of the substrate and to permit a higher load carrying capacity of the coating-substrate-system. In consideration of the increased substrate properties, two high toughness spring steels and an ultra-high toughness aerospace steel were tested on a twin disc tribometer of the Amsler type as well as on an Optimol TwinDisc test rig under mixed/boundary conditions. Different factors such as residual stresses of the substrate, influences of the lubrication, and wear behaviour were investigated. The respective results are presented here. KW - Slip-rolling KW - High toughness steel KW - DLC KW - a-C KW - Thin film coating PY - 2010 SN - 978-1-84564-464-2 DO - https://doi.org/10.2495/HPSM100481 SN - 1746-4498 SN - 1743-3509 VL - 112 SP - 521 EP - 532 PB - WIT Press CY - Ashurst, Southampton, UK AN - OPUS4-21868 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Manier, Charles-Alix A1 - Ziegele, H. A1 - Barriga, J. A1 - Goikoetxea, J. A1 - Woydt, Mathias T1 - Zirconium-based coatings in highly stressed rolling contacts as alternative solution to DLC and ta-C coatings JF - Wear N2 - The slip-rolling resistance of DLC, a-C and ta-C thin film coatings was improved considerably in the last years, but there is still room for improvements in relation to (a) the temperature stability and (b) initial surface roughness after deposition. This paper presents a novel coating-substrate system in comparison to recently developed DLC coatings in a bench-mark test procedure exerting slip-rolling conditions in the presence of liquid lubricants. One of the Zr-based thin film coatings 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 or ten million of cycles under P0max = 2940 MPa. In comparison, some of the newly developed DLC coatings are slip-rolling resistant for at least up to 10 million cycles at RT (some of them also at 120 °C oil temperature) under Hertzian contact pressures of Pmax = 2600/2940 MPa. In general, Zr-based thin film coatings do not require special formulated oil formulations and Zr(C,N) bear on a straight coating architecture suited for mass production with nanosized layers. KW - Slip-rolling resistance KW - Zirconium KW - Zr(C,N) KW - DLC KW - Nanostructured coating KW - Multilayer PY - 2010 DO - https://doi.org/10.1016/j.wear.2010.08.004 SN - 0043-1648 VL - 269 IS - 11-12 SP - 770 EP - 781 PB - Elsevier CY - Amsterdam AN - OPUS4-22347 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Woydt, Mathias T1 - Polyalkyleneglycols as next generation engine oils T2 - Symposium on Testing and Use of Environmentally Acceptable Lubricants T2 - Symposium on Testing and Use of Environmentally Acceptable Lubricants CY - Jacksonville, FL, USA DA - 2010-12-06 PY - 2010 AN - OPUS4-22749 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Woydt, Mathias A1 - Spaltmann, Dirk A1 - von Gablenz, A. T1 - Functional profiles of lubricants and fuels based on second generation plant oils T2 - Symposium on Testing and Use of Environmentally Acceptable Lubricants T2 - Symposium on Testing and Use of Environmentally Acceptable Lubricants CY - Jacksonville, FL, USA DA - 2010-12-06 PY - 2010 AN - OPUS4-22750 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Woydt, Mathias A1 - Berger, L.-M. A1 - Saaro, S. A1 - Stahr, C.C. A1 - Thiele, S. T1 - High-temperature sliding wear of APS-sprayed coatings of the Cr2O3-TiO2 system T2 - 14th NordTrib Conference T2 - 14th NordTrib Conference CY - Älvsbyn, Sweden DA - 2010-06-08 PY - 2010 AN - OPUS4-21007 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Woydt, Mathias A1 - Wäsche, Rolf T1 - The history of the Stribeck curve and ball bearing steels: The role of Adolf Martens JF - Wear N2 - 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. KW - Stribeck curve KW - Martens KW - Stribeck KW - Thurston KW - Gümbel KW - Hirn PY - 2010 DO - https://doi.org/10.1016/j.wear.2010.02.015 SN - 0043-1648 VL - 268 IS - 11-12 SP - 1542 EP - 1546 PB - Elsevier CY - Amsterdam AN - OPUS4-21180 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 JF - Wear 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 - GEN A1 - Woydt, Mathias ED - Czichos, Horst ED - Habig, K.-H. T1 - Hochtemperaturtribologie T2 - Tribologie-Handbuch - Tribometrie, Tribomaterialien, Tribotechnik KW - Ingenieurkeramik KW - Triboaktive Werkstoffe KW - (Ti,Mo)(C,N) KW - Tin-2Cr2O2n-1 KW - Magnéliphasen KW - Hochtemperatur KW - Tribologie KW - SiC KW - Al2O3 KW - ZrO2 KW - Si3N4 PY - 2010 SN - 978-3-8348-1810-2 SP - 611 EP - 623 PB - Springer-Vieweg CY - Wiesbaden ET - 3. Auflage / 2010 AN - OPUS4-21197 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Woydt, Mathias A1 - Manier, Charles-Alix A1 - Weihnacht, V. A1 - Brückner, A. T1 - Wälzbeständigkeit von ta-C Dünnschichten unter hohen Hertzschen Beanspruchungen bis zu 3000 MPa JF - Tribologie und Schmierungstechnik KW - Wälzbeständigkeit KW - ta-C KW - a-C KW - Diamant KW - DLC KW - Überrollbeständigkeit KW - Friction KW - Laser-arc PY - 2010 SN - 0724-3472 VL - 57 IS - 6 SP - 30 EP - 36 PB - Expert Verlag CY - Renningen AN - OPUS4-23201 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Woydt, Mathias T1 - The functional profile of polyglycols in engine applications T2 - 17th International colloquium tribology - Solving friction and wear problems (Proceedings) T2 - 17th International colloquium tribology CY - Esslingen, Germany DA - 2010-01-19 KW - Bionotox KW - Heat capacity KW - Fuel economy KW - Drain Polyglycol KW - Polypropylene glycol KW - Polyalkylene glycol KW - Polybutylene glycol KW - BAM test KW - AlSi liner wear KW - DLC KW - Slip-rolling KW - Lubricants KW - Engine oil KW - Additives KW - Ester KW - Thin film coatings KW - Dilution KW - FAME KW - Jatropha KW - Rape seed KW - Stem valve KW - Piston ring PY - 2010 SP - 17_Woydt_Polyglycols, 1 EP - 11 AN - OPUS4-31736 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Woydt, Mathias A1 - Scholz, Christian A1 - Spaltmann, Dirk T1 - Highly stressed rolling contacts: Thin film coatings or novel steel grades? T2 - 24. International Conference on Surface Modification Technologies (SMT 24) T2 - 24. International Conference on Surface Modification Technologies (SMT 24) CY - Dresden, Germany DA - 2010-09-07 PY - 2010 AN - OPUS4-23072 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Scholz, Christian A1 - Spaltmann, Dirk A1 - Woydt, Mathias T1 - Wälzbeständigkeit von Hochleistungsdünnschichten und hochzähen Stahlsubstraten bis 3.8 GPa Hertz'scher Kontaktpressung T2 - 51. Tribologie-Fachtagung - Reibung, Schmierung und Verschleiß - Forschung und praktische Anwendungen T2 - 51. Tribologie-Fachtagung - Reibung, Schmierung und Verschleiß - Forschung und praktische Anwendungen CY - Göttingen, Deutschland DA - 2010-09-27 KW - Hochzähe Stähle KW - DLC KW - ZrCN KW - Dünnschichten KW - Extrembeanspruchung PY - 2010 SN - 978-3-00-032180-1 VL - I SP - 17/1 EP - 17/11 CY - Aachen AN - OPUS4-22211 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Woydt, Mathias A1 - Scholz, Christian A1 - Spaltmann, Dirk T1 - Wälzbeständigkeit von Hochleistungsdünnschichten und hochzähen Stahlsubstraten bis 3.8 GPa Hertz'scher Kontaktpressung T2 - GfT Tribologie-Fachtagung T2 - GfT Tribologie-Fachtagung CY - Göttingen, Germany DA - 2010-09-27 PY - 2010 AN - OPUS4-23033 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CHAP A1 - Woydt, Mathias ED - Czichos, Horst ED - Habig, K.-H. T1 - Hochtemperaturtribologie T2 - Tribologie-Handbuch - Tribometrie, Tribomaterialien, Tribotechnik N2 - Die Temperatur ist eine fundamentale Beanspruchungs- bzw. Einflussgröße für alle tribologischen Systeme. Für die in zahlreichen tribologischen Systemen benötigten Schmierstoffe liegen die thermischen Stabilitätsgrenzen bei etwa 400?°C. Es wird die tribologische Prüftechnik für Tribomaterialien beschrieben, die für den Einsatz in tribologischen Systemen bei hohen Betriebstemperaturen verwendbar sind. Ausgehend von metallurgischen Lösungsansätzen aus der Tribologieforschung werden Anwendungsmöglichkeiten hochtemperaturbeständiger Ingenieurwerkstoffe mit Beispielen aus der Automobiltechnik (Luftlagerung von Turboladern, Leistungssteigerung von Bremsmaterialien), der Fertigungstechnik (Standzeitverlängerung von Werkzeugen) und dem chemischen Anlagenbau (Effizienzsteigerung von Kühlkreisläufen) dargestellt. PY - 2010 SN - 978-3-8348-1810-2 DO - https://doi.org/10.1007/978-3-8348-2236-9_18 SP - Kap. 18, 633 EP - 646 PB - Springer-Vieweg CY - Wiesbaden ET - 4. Auflage / 2015 AN - OPUS4-33840 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -