Abstract
To improve the tribological properties of diamond-like carbon (DLC) film in diesel engines, Molybdenum-doped DLC (Mo-DLC) film was prepared by a radio frequency (RF) magnetron sputtering system. The results showed that Mo content in the film was approximately 11 at.%. Mo doping decreased the internal stress of the DLC film and increased the adhesion of film-substrate from 40 mN to 190 mN. The sp2 bond content in the Mo-DLC film was increased and molybdenum carbide was formed by Mo doping, which led to the formation of nano-cluster/amorphous microstructure. The wear resistance of the Mo-DLC film was significantly improved under air and diesel conditions. The results of this study provide a better understanding of the tribology behaviour of the DLC films in air and diesel environment.
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