To improve the interfacial bonding performance between friction component SiO2 particles and copper matrix.Two copper-based powder metallurgy friction materials were prepared by using SPS sintering technology with Cu-coated SiO2 and uncoated SiO2 particles as one of the friction components.The microstructure,mechanical and physical properties of the two friction materials were analyzed,and the braking friction and wear properties were tested on the MM1000-Ⅱ inertia braking test bench.The microscopic analyses on the features of friction surfaces and 3D morphology,wear debris and surface phases of the two friction materials were carried out,and the influences of metal coating on SiO2 surface on braking friction and wear properties of copper-based powder metallurgical friction material were studied.The results show that the Cu-coating treatment of SiO2 can strengthen the interface bond between SiO2 and copper matrix and improve the hardness,density and thermal conductivity of material,especially a significant increase in thermal conductivity.With the increase of the initial braking speed,the average friction coefficients of the two friction materials show a trend of increasing first and then decreasing.Under the same braking conditions,compared with ordinary SiO2 materials,except that the braking condition of pressure of 0.8 MPa and initial braking speed of 100 km/h,the copper-coated SiO2 containing material has higher average friction coefficient and lower wear rate under other braking conditions,and its friction surface is smoother.Increasing the initial braking speed can promote the formation of a friction film dominated by oxide films on the surfaces of the two friction materials,and the friction film of the copper-coated SiO2 containing material is more uniform,so the protection effect is better,that is,the wear rate is low.