Abstract:Diamond-like Carbon (DLC) films was deposited on the bearing steel by closed-filed unbalanced magnetron
sputter technique, and CrN films was deposited on the bearing steel by cathodic arc ion plating. The tribological
performance of DLC and CrN films in the fully formulated engine oil (CF-4, 15W/40) lubrication conditions were investigated
on a SRV-IV tribo-meter. The effects of load and temperature on the friction coefficient and wear rate were
analyzed. The results indicate that the friction coefficient of two kinds of films decreases with increasing load under oil
lubrication condition. DLC solid/ liquid synergistic lubrication have excellent tribological properties compared to the liquid
lubrication. Thin tribofilm on the interface caused by the tribochemical interaction between CrN films and additives
in the CF-4 engine oil decrease the friction coefficient under high load and high temperature. In addition, the wear resistance
of the CrN films was improved as oxide layer formed on the surface at higher temperature.
