Abstract

Developing Ag-doped WS2 2 film can be used to improve wear endurance for space conductive sliding component in future. Herein, the tribological properties of WS2-Ag 2-Ag nanocomposite films were mainly investigated in vacuum in detail. The results show that incorporation of Ag leads to film structure becoming very dense, obviously enhancing mechanical properties. With increase of Ag content, the wear life of the films firstly is prolonged and then is shortened, among which the film doped 6.42 at.% Ag exhibits the most excellent tribological performance. It is attributed that WS2-Ag 2-Ag crystal grains occurred alignment with the (002) easy-shear planes, thus forming the thick long-range ordered WS2-Ag 2-Ag crystalline transfer film only in optimized Ag content for dense film. Noteworthily, Ag nanocrystalline dispersed into WS2 2 crystals is found to play a vital role in combination and strengthening to microstructure of transfer film. Ultimately, the lubricating mechanism of WS2-Ag 2-Ag film is revealed by clarifying its transfer behavior occurred on sliding contact area.

Keywords Plus：COATINGS，SPACE，FRICTION，RESPONSES，VACUUM，GROWTH，CARBON

Published in APPLIED SURFACE SCIENCE，Volume 674；10.1016/j.apsusc.2024.160928，NOV 15 2024