Research on Superlubrication Behavior of Sic and Si3n4 Induced by Nanoparticles in Water-Glycol

Abstract

Considering the low cost and excellent lubrication performance, nanoparticles may become lubricating additives for water-glycol (W-G). Therefore, this article aims to explore the frictional properties of SiC and Si3N4 pairing pairs in water-glycol nanofluids doped with SiO2 and TiO2 nanoparticles by investigating the friction coefficient and wear loss. The experiments reveal that SiO2 and TiO2 nanoparticles reduce the friction coefficient of paired pairs in water-glycol by 98% and 92%, respectively. 1.5 wt% SiO2 nanoparticles can induce pairing pairs to achieve superlubricity with a friction coefficient as low as 0.0005. SiO2 and TiO2 nanoparticles, due to their small size, are quickly filled into the contact interface, promoting a smooth surface. SiO2 nanoparticles can improve the wetting performance of water ethylene glycol at the contact interface, promoting the formation of fluid lubrication at the contact interface. TiO2 nanoparticles exhibit rolling effects at the contact interface.

Keywords: Deep-sea hydraulic, Water-glycol lubrication, SiO2 nanoparticle, Tribological mechanism