TY - GEN A1 - Hartelt, Manfred A1 - Wäsche, Rolf T1 - Volumetrische Verschleiß-Berechnung an gekrümmten Kontaktgeometrien T2 - 50. Tribologie-Fachtagung - Reibung, Schmierung und Verschleiß - Forschung und praktische Anwendung CY - Göttingen, Deutschland DA - 2009-09-21 KW - Verschleißberechnung KW - Calculation of wear volume PY - 2009 SN - 978-3-00-028824-1 VL - I SP - 3-1 - 3-9 CY - Aachen AN - OPUS4-20023 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Wäsche, Rolf A1 - Hartelt, Manfred A1 - Weihnacht, V. T1 - Influence of counterbody material on wear of ta-C coatings under fretting conditions at elevated temperatures N2 - 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. KW - Fretting KW - Hard carbon coatings KW - ta-C KW - High temperature KW - Counterbody influence PY - 2009 DO - https://doi.org/10.1016/j.wear.2009.08.041 SN - 0043-1648 VL - 267 IS - 12 SP - 2208 EP - 2215 PB - Elsevier CY - Amsterdam AN - OPUS4-20344 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Wäsche, Rolf A1 - Hartelt, Manfred A1 - Gräber, H.G. T1 - Experimental study on wear of dental ceramic materials - tests in artificial saliva T2 - 17th International colloquium tribology - Solving friction and wear problems CY - Stuttgart/Ostfildern, Germany DA - 2010-01-19 KW - Fretting KW - Life science KW - Wear KW - Dental materials PY - 2010 SN - 3-924813-80-9 IS - Special aspects of tribology SP - 1 EP - 7 AN - OPUS4-21070 LA - eng 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 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 - Cruzado, A. A1 - Hartelt, Manfred A1 - Wäsche, Rolf A1 - Urchegui, M.A. A1 - Gómez, X. T1 - Fretting wear of thin steel wires. Part 1: Influence of contact pressure N2 - 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. KW - Fretting KW - Wear KW - Wires KW - Contact pressure KW - Unlubricated tests PY - 2010 DO - https://doi.org/10.1016/j.wear.2010.02.017 SN - 0043-1648 VL - 268 IS - 11-12 SP - 1409 EP - 1416 PB - Elsevier CY - Amsterdam AN - OPUS4-21181 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Hartelt, Manfred A1 - Wäsche, Rolf A1 - Djahanbakhsh, Mohammad A1 - Österle, Werner T1 - Vergleich von Standard-Modell- und HIP-Simulator-Untersuchungen an Verschleißschutzschichten für Metall-Keramik-Paarungen bei Endoprothesen KW - Beschichtung KW - Reversierender Gleitverschleiß KW - HIP-Simulation KW - Coating KW - Reciprocating sliding KW - HIP-Simulation PY - 2008 SN - 0724-3472 VL - 55 IS - 1 SP - 21 EP - 25 PB - Expert Verlag CY - Renningen AN - OPUS4-17133 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Wäsche, Rolf T1 - Tribotesting with small loads and amplitudes - how does it compare to normal conditions in oscillating sliding? T2 - 27th Meeting of the International Research Group on Wear of Engineering Materials CY - Berlin, Germany DA - 2008-09-30 PY - 2008 AN - OPUS4-18215 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Wäsche, Rolf T1 - Tribological behavior of hard carbon coatings sliding against aluminum oxide, silicon nitride and steel up to 250 °C in air T2 - NORDTRIB 2008, 13th Nordic Symposium on Tribology CY - Tampere, Finland DA - 2008-06-10 PY - 2008 AN - OPUS4-18217 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Wäsche, Rolf T1 - Physikalisch-chemische Grundlagen der Festschmierstoffe T2 - TAE Esslingen: Lehrgang: Reibungs- und Verschleißminderung durch Festschmierstoffe CY - Ostfildern, Germany DA - 2008-03-31 PY - 2008 AN - OPUS4-18316 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Wäsche, Rolf T1 - Grundlagen der Schwingungsverschleißprüfung T2 - TAE Esslingen + GfT: Seminar: Reibung und Verschleiß von Werkstoffen, Bauteilen und Konstruktion CY - Ostfildern, Germany DA - 2008-04-08 PY - 2008 AN - OPUS4-18317 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Wäsche, Rolf T1 - Verschleißprüfung als Werkzeug für die keramikbezogene Werkstoffentwicklung T2 - Hannover-Messe 2008: Werkstoff-Forum CY - Hanover, Germany DA - 2008-04-25 PY - 2008 AN - OPUS4-18318 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Österle, Werner A1 - Djahanbakhsh, Mohammad A1 - Hartelt, Manfred A1 - Wäsche, Rolf T1 - 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 N2 - 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. KW - Hip simulator KW - Reciprocating sliding test KW - A-C:H KW - Coating failure KW - Artificial hip joint PY - 2008 DO - https://doi.org/10.1016/j.wear.2008.04.008 SN - 0043-1648 VL - 265 IS - 11-12 SP - 1727 EP - 1733 PB - Elsevier CY - Amsterdam AN - OPUS4-18439 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Wäsche, Rolf T1 - Tribological characterisation with crossed cylinders - comparison of methods and application examples T2 - TAE Esslingen: 16. International Colloquium Tribology 2008 CY - Ostfildern, Germany DA - 2008-01-15 PY - 2008 AN - OPUS4-18463 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Wäsche, Rolf T1 - The interface as key to unclustard ceramic tribology T2 - SRV Workshop und Normungstagung CY - Nagoya, Japan DA - 2008-03-11 PY - 2008 AN - OPUS4-18464 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Wäsche, Rolf T1 - Influence of deposition parameters on tribological properties of CNx coatings T2 - WOM, 17th International Conference on Wear of Materials CY - Las Vegas, NV, USA DA - 2009-04-19 PY - 2009 AN - OPUS4-19364 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Wäsche, Rolf A1 - Hartelt, Manfred A1 - Springborn, U. A1 - Bewilogua, K. A1 - Keunecke, M. T1 - Wear of carbon nitride coatings under oscillating sliding conditions N2 - 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. KW - Carbon nitride KW - Wear KW - Fretting KW - Dry sliding KW - Paraffin oil PY - 2010 DO - https://doi.org/10.1016/j.wear.2010.08.010 SN - 0043-1648 VL - 269 IS - 11-12 SP - 816 EP - 825 PB - Elsevier CY - Amsterdam AN - OPUS4-22208 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Wäsche, Rolf A1 - Yarim, Rasim A1 - Klaffke, Dieter A1 - Hartelt, Manfred ED - Bartz, Wilfried J. T1 - Oscillating Sliding Wear Behaviour of SiC, TiC, TiB2, 59SiC-41TiB2 and 52SiC-24TiC-24TiB2 Materials up to 750°C in Air T2 - 14th International Colloquium Tribology, Tribology and Lubrication Engineering CY - Stuttgart, Deutschland DA - 2004-01-13 PY - 2004 SN - 3-924813-54-X VL - II SP - 1039 EP - 1045 PB - Techn. Akad. Esslingen CY - Ostfildern AN - OPUS4-3057 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Klaffke, Dieter A1 - Wäsche, Rolf A1 - Wötting, G. ED - Bartz, Wilfried J. T1 - Tribological Characterisation of a Sl3N4-TiN Composite Ceramic in Fretting Tests at Room Temperature T2 - 14th International Colloquium Tribology, Tribology and Lubrication Engineering CY - Stuttgart, Germany DA - 2004-01-13 PY - 2004 SN - 3-924813-54-X VL - III SP - 1413 EP - 1420 PB - Techn. Akad. Esslingen CY - Ostfildern AN - OPUS4-3058 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Klaffke, Dieter A1 - Wäsche, Rolf A1 - Aldinger, F. A1 - Janakiraman, N. ED - Bartz, Wilfried J. T1 - Tribological investigations on siliconcarbonitride ceramics derived from preceramic polymers T2 - 14th International Colloquium Tribology, Tribology and Lubrication Engineering CY - Stuttgart, Deutschland DA - 2004-01-13 PY - 2004 SN - 3-924813-54-X VL - 3 SP - 1403 EP - 1412 PB - Techn. Akad. Esslingen CY - Ostfildern AN - OPUS4-3059 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Wäsche, Rolf T1 - Oscillating Sliding Wear Behaviour of SiC, TiC, TiB2, 59SiC-41TiB2 and 52SiC-24TiC-24TiB2 Materials up to 750°C in Air T2 - 14th International Colloquium Tribology, Tribology and Lubrication Engineering CY - Ostfildern, Germany DA - 2004-01-13 PY - 2004 AN - OPUS4-3076 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -