Water lubrication characteristics for each specimen supporting silica nanoparticles with a sliding distance of 1000 m

Abstract

In ring-on-disk friction tests, our group observed superlubricity in water with silica nanoparticles loaded on silicon carbide, silicon nitride, Si-DLC, silicon nitride and a-C:H pairs, and found the superiority of silicon nitride and a-C:H pairs. In this report, ring-on-disk friction tests with silicon carbide pairs, Si50wt%-DLC pairs and silicon nitride and a-C:H pairs were conducted at a constant load of 500 N and a sliding speed of 300 mm/s with a sliding distance of 1000 m. The results showed that on the friction surfaces that developed ultra-low friction, the presence of a thin layer, which could be considered a silica film, was observed on the silicon carbide pair and on the silicon nitride and a-C:H pair. It was found that the silicon nitride and a-C:H pair required sufficient blending time compared to the silicon carbide pair. The formation of a silica film inducing ultra-low friction can be expected if sufficient mixing time is ensured in the silicon nitride and a-C:H pair.