ADAPTIVE DLC COATINGS WITH DIFFERENT MoS2 CONTENT

Abstract

DLC coatings are widely used in engineering as they are resistant to abrasive wear. However, they exhibit anincreased coefficient of friction at temperatures of around 300C. Soft MoS2 coatings are known to maintaina low coefficient of friction at temperatures up to about 350C, but suffer from relatively high abrasive wear.Publications from the last decade report a synergistic improvement in the tribological performance of acoating consisting of both these materials. The aim of this study was to investigate the wear resistance ofcoatings composed of different a-C and MoS2 contents applied by magnetron sputtering on steel. The resultsobtained in tribological tests conducted using the ball-and-disk method showed at least 20% better adhesionto the substrate of the two-component nanocomposite coating and its increased wear resistance from 15% toas much as 700%, compared to single-component coatings in tests conducted at 20C and 250C. The testsshowed no deterioration of the two-component coating's coefficient value compared to DLC.