Preparation and property characterization of WS2 coatings deposited on micro-nano textured surfaces of cemented carbide at different WS2 target currents

摘要

WS2 coatings were deposited on a micro-nano textured surface of cemented carbide by means of medium frequency magnetron sputtering, multi-arc ion plating and ion-beam-assisted deposition techniques. The effects of different WS2 target currents on the physical properties of the WS2 coating then were investigated. Furthermore, the mechanisms of soft WS2 coatings deposited on an untextured plain surface versus a micro-nano textured surface in the scratch test were evaluated. The results showed that when the WS2 target current was 1 A, the morphology of the periodic coated micro-nano textures was the clearest, the WS2 (002) crystal face of the type-II texture (c-axis perpendicular to substrate) demonstrated the best coating crystallization and the coating/substrate critical load was the largest among the five samples. It was also discovered that the WS2 soft coating formed a lubricating film on the micro-nano textured surface that reduced coating spallation and brittle fracture during the scratch test. It was concluded therefore that the soft WS2 coating on the micro-nano textured surface effectively improved the coating/substrate critical load value.