Tribological Performance of DLC Coatings under Water Lubrication

Chaoqun Zhang ； Masahiro Fujii

《Proceedings of the 14th IFToMM World Congress》 14th-3 (2015/10) Pp. 648-656

https://doi.org/10.6567/IFToMM.14TH.WC.OS18.019

並列摘要

DLC coatings are currently used in a wide variety of industrial fields because of their outstanding properties such as high hardness, high wear resistance, low friction and so on under oil lubrication as well as no lubrication. The tribological properties were compared with six types of DLC coatings: amorphous hydrogenated DLC (a-C: H), that doped with tungsten (a-C: H: W), that doped with silicon (a-C: H: Si) and hydrogen-free DLC (ta-C). Sliding tests were conducted under water lubrication at sliding velocities of 0.02 m/s and 0.1 m/s. DLC coatings showed low friction coefficient and excellent wear resistance. Friction coefficient and wear rate decreased with increasing sliding velocity. The effect of surface wettability and mechanical properties on tribological characteristic were investigated. Friction coefficient decreased as the contact angle increased. Hydrogen-free DLC-4 with the highest hardness showed the highest friction and a larger wear. Furthermore, DLC coatings deposited with interlayer showed longer lifetimes.

並列關鍵字

DLC ； Friction ； Wear ； Water lubrication