Improvement the tribological properties of diamond-like carbon film via Mo doping in diesel condition. (April 2022)

• Record Type: Journal Article
• Authors: Su, Yongyao; Cai, Lixin; Huang, Weijiu; Zhang, Tengfei; Yu, Weijie; Zhang, Peng; Hu, Rong; Gong, Xiaohong
• Is Part Of: Vacuum. Volume 198(2022)
• Publication Date: 2022-04
• Subjects: Diamond-like carbon -- Molybdenum -- Adhesion -- Wear resistance; Vacuum -- Periodicals; 621.55
• DOI: 10.1016/j.vacuum.2022.110920
• Languages: English
• ISSNs: 0042-207X

Abstract

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 sp 2 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. Highlights: Mo-doped DLC film was fabricated by radio frequency magnetron sputtering system. Hardness and internal stress of DLC film could be decreased by Mo-doping due to its nano-cluster/amorphous microstructure. Mechanical wear was the predominant loss mechanism for DLC and Mo-DLC films in air and diesel environments. Mo-DLC film showed excellent wear resistance and lower the wear loss of the friction pair.