Study on the Lubricating Characteristics of Graphene Lubricants

Abstract

Graphene is considered a good lubricant additive. The lubricating properties of graphene lubricant at different concentrations and temperatures are studied via a four-ball friction and wear-testing machine. The results show that the coefficient of friction (COF) and wear scar diameter (WSD) of the steel ball with 0.035 wt% graphene lubricant decreased by 40.8% and 50.4%, respectively. Finally, through surface analysis, the following lubrication mechanism is proposed: as the added graphene particles can easily fill and cover the pores of the friction surface, the contact pressure of the rough peak is reduced, resulting in a lower COF and smoother surface. Although the COF increases with temperature, graphene lubricants still exhibit good lubrication effects.

Hydrophilized MoS2 as Lubricant Additive

“…Tremendous efforts have been directed toward improving grease performance through the incorporation of various additives. Amongst these, the inclusion of two-dimensional (2D) materials, such as graphene, boron nitride, Mxenes, zirconium phosphate, and MoS 2 , has garnered considerable interest [5][6][7][8]. This is primarily ascribed to the distinctive characteristics exhibited by these materials, such as their high-strength layered structure, low friction, and enhanced resistance to wear [9][10][11][12].…”