Tribochemical-Reaction Mechanism of Lubricant Additives on Titanium Doped DLC Films

Abstract

Several types of metal doped DLC films were developed in order to improve the adhesion property and the lubricity. This paper discussed lubrication mechanism of Ti doped DLC films (Ti-DLC) with the results of sliding test and surface analysis by using TOF-SIMS. Large amount of sulfur and molybdenum was detected on wear track of Ti-DLC with ZnDTP+MoDTC additives. On the other hand, there were few amount of sulfur and molybdenum on the CVD-DLC. These analytical results indicate that MoS₂ was generated by tribochemical reaction of ZnDTP and MoDTC on the Ti-DLC, and formation of MoS₂ caused the low friction property.