Abstract:Copper-10%graphite sintered material was prepared by powder metallurgy technology. Effects of different brake modes on friction and wear properties of copper-graphite friction materials were investigated on GF150D friction tester, under dry conditions, with brake pressure of 0.51 MPa. The results show that the friction coefficient of the material is increased with the decreasing of the brake speed at the friction mode (from high speed indirect brake to low speed). This is attributed to the breaking and peeling off of the dense third bodies on the friction surfaces, which increases mechanical engaging force. Meanwhile, the wear rate of the material is reduced, due to the decrease of friction surface temperature, which increases matrix strength. Friction coefficient and wear of friction mode B(from high speed direct brake to low speed) are higher than those of friction mode A.