Friction and wear tests were conducted to determine the tribological properties of hard materials, such as coating films and sintered ceramics, versus several types of industrial metals.
TiN and CrN films deposited on flat tungsten-carbide substrates by ionplating were selected as coating film specimens. Si3
and SiC as sintered ceramic specimens. Each specimen was slid reciprocally against metal balls (SUJ2, SUS304, Ti-6Al-4V, Ti, and Al). After sliding experiments, specimen wear and metal transfer were studied.
SiC showed the lowest friction coefficient in this study. Sintered ceramic specimens wore normally. In contrast, peeling wear occurred on the TiN film against SUJ2, SUS304, and Ti-6Al-4V. Coating films, especially CrN, have better wear resistance than sintered ceramics. Mating materials (metal balls) wore heavily in sliding against coating films, presumably the sub-micro-scale surface roughness of coating films affected the wear.