The purpose of this paper is to discuss the mechanism of wear phenomena about the diamond-like carbon (DLC) film due to the molybdenum dithio carbamate (Mo-DTC) by confirming the friction and wear properties between DLC films and the mating member with different oil adsorption properties under engine oil environment. Therefore, we prepared some DLC films produced by changing the feed gas composition using plasma CVD method, and selected iron and aluminum as mating member of DLC films because the oil-adsorbed ability were different. And we evaluated friction and wear properties using reciprocation tribometer. As a result, we found that the wear of the DLC film due to the Mo-DTC does not occur in the case of aluminum. We conducted a surface analysis by XPS to analyze the mechanism of DLC wear due to Mo-DTC. The results showed that the product ratio of MoO3 in the case of aluminum is small as compared with the case of the iron.
