▎ 摘　　要

The rheological and tribological properties of polyurea greases with different contents of few layers of graphene (FLG) were studied, and the influence mechanism of temperature and load on few layers of graphene was discussed. The results show that FLG is more suitable as a friction reduction and wear additive for polyurea greases at high temperatures or at normal temperatures and low loads below 1 wt% and less suitable at normal temperatures and high loads. Thickener chemisorbed film, FLG deposition film and friction reaction film composed of FeO (OH), Fe2O3, Fe3O4 and other oxides form a boundary lubrication film on the friction pairs lubricated by grease containing FLG.The stiffness of the frictional boundary film is enhanced by the absorption of FLGs on the grease thickening. The thermal conductivity of graphene hinders frictional boundary film deterioration and promotes oxide film formation, resulting in reduced friction and wear on the contact surface.