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Tribological behaviour of hard carbon coatings sliding against aluminum oxide, silicon nitride and steel up to 250 deg C in air

: Wäsche, R.; Hartelt, M.

Kleemola, J. ; Tampere University of Technology:
Proceedings of NORDTRIB 2008, 13th Nordic Symposium on Tribology. CD-ROM : Scandic Rosendahl Hotel, Tampere, Finland, June 10 - 13, 2008
Tampere: Tampereen Teknillinen Yliopisto, 2008
ISBN: 978-952-151959-8
14 S.
Nordic Symposium on Tribology (NORDTRIB) <13, 2008, Tampere>
Fraunhofer IWS ()
Gleitkontakt; Beschichtung=Überzug; amorpher Kohlenstoff; Aluminium; Siliciumnitrid; Stahl; Reibungsverhalten; Verschleißrate; Hochtemperatur; diamantähnlicher Kohlenstoff

The high temperature tribological performance of tetrahedral amorphous carbon coatings has been analyzed at elevated temperatures up to 250 deg C. 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 obviously an unstable interface with fluctuating COF and relatively high wear rates.