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Influence of counterbody material on wear of ta-C coatings under fretting conditions at elevated temperatures

Der Einfluss des Gegenkörperwerkstoffs auf den Verschleiß von Überzügen aus tetrahedralem amorphen Kohlenstoff unter Reibverschleißbedingungen bei erhöhten Temperaturen
 
: Wäsche, R.; Hartelt, M.; Weihnacht, V.

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Wear 267 (2009), Nr.12, S.2208-2215
ISSN: 0043-1648
ISSN: 1873-2577
Nordic Symposium on Tribology (NORDTRIB) <13, 2008, Tampere>
Englisch
Konferenzbeitrag, Zeitschriftenaufsatz
Fraunhofer IWS ()
Hartstoffüberzug; diamantähnlicher Kohlenstoff; Kontaktermüdung; Tribokorrosion; Hochtemperaturverhalten; Verschleiß; Reibpaarung; Chromstahl; Aluminiumoxid; Siliciumnitrid; Reibungskoeffizient

Abstract
The high temperature tribological performance of tetrahedral amorphous carbon coatings has been analyzed at elevated temperatures up to 250 deg C in air against three different counterbody materials - steel 100Cr6, alpha-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 deg 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 (coefficient of friction) and relatively high wear rates due to its own inherent tendency to tribo-oxidation.

: http://publica.fraunhofer.de/dokumente/N-116003.html