▎ 摘　　要

Graphene-based LaF3(GN/LaF3) nanocomposite materials were prepared by Liquid-phase Ultrasonic Exfoliation. The morphologies of GN/LaF3 nanocomposite materials were characterized by SEM and TEM. The tribological properties of the nanocomposite materials as a water additive were investigated using a multi-functional reciprocating friction and wear tester. The lubrication mechanism was discussed based on the results of SEM, and XPS. The results show that the LaF3 nanoparticles with the size of 5 similar to 50 nm, are densely and homogeneously deposited on the surface of multilayer graphene sheets. The GN/LaF3 nanocomposite materials exhibit good friction-reducing and anti-wear performance. Compared with pure water, it can reduce the friction coefficient by 34.35% and the wear mass by 52.40% under the load 10 N and concentration 0.01 wt%. It is attributed to the effect of the adsorption membrane and tribochemistry reaction films which inhibit the oxidation of Fe and reduce the wear.