Effect of diamond grain size on the tribological properties of WS2-based multilayer coatings

摘要

The roughness and patterns of the substrate are important factors that affect the lubrication performance of the solid lubrication coating (SLC), the wear resistance and service life significantly improved by appropriate roughness and patterns. By controlling the size of the diamond grains, three different surface roughness were formed and the WS2-based multiple-layer structured films (M-WSx) with different W/S ratio were prepared on diamond coatings, and the tribological properties were investigated by rotational friction tester. The results shown that properly sized (1-3 mu m) diamond grains effectively prolong the service life of M-WSx. The diamond grains effectively suppressed the loss rate of WSx and remarkably enhanced the bearing capacity of the SLC. Meanwhile, the agglomeration of WSx/wear debris and the weakening effect of the transfer film on abrasive wear were observed. Accordingly, the mechanism of wear resistance and tribological model were studied.