Tribological behavior of DLC/IL solid-liquid lubricating coatings in a high-vacuum condition with alternating high and low temperatures

摘要

In this paper, ionic liquid (IL) diamond-like carbon (DLC)-based solid-liquid lubricating coatings were used to conduct friction and wear experiments under a high-vacuum condition with alternating temperatures between -100 and 150℃. The results showed that the friction coefficients at 100 and -100℃ were the lowest and the largest, respectively. Considering that the mobility, activity, spread-ability, and self-repairing capacity of IL were significantly better at high temperatures compared with those at low temperatures, the DLC film surface slightly graphitized at a relatively high temperature. The disc wear rates were the lowest at room temperature and the highest at 150℃ because the surface graphitization of the DLC film and the large friction coefficient resulted in an increase in wear rate.