TY - JOUR A1 - Santner, Erich A1 - Klaffke, Dieter A1 - Meine, Kerstin A1 - Polaczyk, Christoph A1 - Spaltmann, Dirk T1 - Demonstration of topography modification by friction processes and vice versa N2 - Contact formation and development are the basis of friction and wear modelling and understanding. Unanimously topography formation and development in friction contacts are regarded of highest importance for understanding and modelling friction processes. The frequently found running in behaviour of sliding contacts is—aside from the build up of reaction and transfer layers-at least partly caused by the topography development due to friction processes until a stable equilibrium state is reached. Experimental results of friction and topography measurements are presented which demonstrate the mutual modification of friction and contact topography. A special experimental set up with an AFM allowed to correlate the measured friction forces with the contact position and the topography at this point. In this way, friction force transitions and changes can be assigned to topography changes due to abrasion, adhesion and wear particle agglomeration. Contact surfaces with artificial regular structures have been prepared to avoid problems with topography and friction correlation due to the statistical nature of roughness on technical contact surfaces. The friction effects of roughness were simulated by etched ditches of defined width, depth and distance on silicon or metal surfaces. This allowed to explain the mutual influences of topography and friction. The effect of a single ‘asperity’ and of the 'roughness structures' could be demonstrated. Topography measurements with an AFM correlated with the friction force could help to understand friction changes without changing any parameter. KW - Friction KW - Roughness KW - Topography KW - Adhesion KW - Wear PY - 2006 DO - https://doi.org/10.1016/j.triboint.2005.04.029 SN - 0301-679X VL - 39 SP - 450 EP - 455 PB - Butterworth-Heinemann CY - Oxford AN - OPUS4-31744 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Klaffke, Dieter T1 - Influence of Test Parameters on Friction and Wear Results Obtained in Oscillating Sliding Tests with 100Cr6 Steel against SiC-based Materials KW - Friction KW - Wear KW - Steel KW - Silicon carbide KW - Frequency KW - Load KW - Stroke KW - Relative humidity PY - 2003 SN - 1354-4063 SN - 1557-685X VL - 10-1 IS - 10 SP - 19 EP - 32 PB - Coppin CY - Deal AN - OPUS4-3130 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Klaffke, Dieter A1 - Hartelt, Manfred A1 - Brand, C. A1 - Brand, J. A1 - Wittorf, R. T1 - Einfluss der Temperatur auf das tribologische Verhalten von DLC-Schichten N2 - Diamantähnliche Kohlenstoffschichten (DLC) zeichnen sich durch ein sehr günstiges Reibungs- und Verschleißverhalten aus. Auf vielen Werkzeugen und hochbelasteten Bauteilen ist DLC daher bereits erfolgreich im Einsatz. In naher Zukunft wird die Bedeutung dieser Schichten als Oberflächenschutz in tribologischen Systemen weiter ansteigen. Wie viele Applikationsbeispiele zeigen, ist die Leistungsfähigkeit von DLC als Schicht zur Verringerung von Reibung und Verschleiß zwar groß, weist aber auch Grenzen auf. Vor allem bei höheren Temperaturen (> 300 °C) treten Strukturveränderungen oder sogar Oxidationsvorgänge auf, die auch die tribologischen Eigenschaften der Schichten verschlechtern können. Reibungs- und Verschleißuntersuchungen (Schwingungsverschleiß) von DLC-Schichten wurden im Temperaturbereich von 25 °C bis 250 °C durchgeführt und zeigen ein schnelleres Durchreiben der Schicht bei höheren Temperaturen. Die Lebensdauer der Schichten wird mit zunehmender Prüftemperatur reduziert. Einsatzgrenzen für DLC-Schichten können abgeleitet werden. T2 - DGM-Tagung "Reibung und Verschleiß" CY - Fürth, Deutschland DA - 2004-03-10 KW - Friction KW - Wear KW - DLC KW - Temperature KW - Thermal resistance PY - 2004 DO - https://doi.org/10.1002/mawe.200400795 SN - 0933-5137 SN - 1521-4052 VL - 35 IS - 10/11 SP - 936 EP - 941 PB - Wiley-VCH Verl. CY - Weinheim AN - OPUS4-4662 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Wäsche, Rolf A1 - Klaffke, Dieter A1 - Troczynski, T. T1 - Tribological performance of SiC and TiB2 against SiC and Al2O3 at low sliding speeds N2 - 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. KW - Titanium diboride KW - Friction KW - Wear KW - Relative humidity KW - Counter body material PY - 2004 DO - https://doi.org/10.1016/S0043-1648(03)00444-7 SN - 0043-1648 VL - 256 SP - 695 EP - 704 PB - Elsevier CY - Amsterdam AN - OPUS4-3481 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Klaffke, Dieter A1 - Berger, Georg A1 - Hartelt, Manfred T1 - Tribologische Untersuchungen an Ti-6Al-4V mit und ohne Calciumtitanat-Reaktionsschicht KW - Reibung KW - Verschleiß KW - Ti-6Al-4V KW - Calciumtitanat KW - Friction KW - Wear KW - Calcium titanate PY - 2004 SN - 1616-0177 SN - 0011-8656 VL - 5 IS - 2 SP - 67 EP - 70 PB - Verl. Neuer Merkur CY - München AN - OPUS4-3684 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Klaffke, Dieter A1 - Sander, Harro A1 - Hartelt, Manfred T1 - Influence of Temperature and Relative Humidity on the Friction and Wear of Unlubricated Reciprocating Sliding Steel / Steel Couples KW - Reibung KW - Verschleiß KW - Temperatur KW - Schallemission KW - Elektrischer Widerstand KW - Luftfeuchte KW - Friction KW - Wear KW - Reciprocating sliding KW - Relative humidity KW - Temperature KW - Steel couples PY - 2004 SN - 1354-4063 SN - 1557-685X VL - 10-4 IS - 10 SP - 327 EP - 346 PB - Coppin CY - Deal AN - OPUS4-3783 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Klaffke, Dieter T1 - Influence of Normal Force and Humidity on the Friction and Wear of Unlubricated Reciprocating Sliding Steel / Steel Couples KW - Reibung KW - Verschleiß KW - Normalkraft KW - Luftfeuchte KW - Reciprocating sliding KW - Stainless steel KW - Role reversal KW - Normal force KW - Relative humidity KW - Friction KW - Wear PY - 2004 SN - 1354-4063 SN - 1557-685X VL - 10 SP - 311 EP - 325 PB - Coppin CY - Deal AN - OPUS4-3764 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Skopp, André A1 - Klaffke, Dieter A1 - Buchkremer-Hermanns, H. A1 - Ren, H. A1 - Weiß, H. T1 - Tribological behavior of MW PACVD diamond coatings in vibrating contacts KW - Diamond coatings KW - Chemical vapour deposition KW - MW PACVD KW - Vibrating contacts KW - Steel/diamond pairings KW - Running-in KW - Wear KW - SEM KW - EDX KW - LRS KW - AFM KW - Surfaces KW - Wear scar KW - Transfer layer KW - Debris PY - 1997 SN - 1354-4063 SN - 1557-685X VL - 4-1 SP - 3 EP - 27 PB - Coppin CY - Deal AN - OPUS4-2429 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Klaffke, Dieter A1 - Wäsche, Rolf A1 - Janakiraman, N. A1 - Aldinger, F. T1 - Tribological characterisation of siliconcarbonitride ceramics derived from preceramic polymers N2 - 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. KW - Ceramics KW - Preceramic polymer KW - Siliconcarbonitride KW - Friction KW - Wear PY - 2006 DO - https://doi.org/10.1016/j.wear.2005.04.031 SN - 0043-1648 VL - 260 IS - 7-8 SP - 711 EP - 719 PB - Elsevier CY - Amsterdam AN - OPUS4-12302 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Klaffke, Dieter A1 - Schultrich, B. A1 - Weihnacht, V. T1 - Tribological behaviour of ta-C coatings under water lubricated conditions KW - Friction KW - Wear KW - ta-C coatings KW - Water lubrication PY - 2005 UR - http://www.om.ugal.ro/AnnalsFasc8Tribology/pdf/2005/4-Annals2005-2-Klaffke.pdf SN - 1221-4590 SN - 1220-0824 SP - 24 EP - 28 CY - Gala¸ti AN - OPUS4-12361 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -