Effects of braking velocity on friction properties of Cu-based powder metallurgy friction material

Cu-based powder metallurgy friction material was prepared by powder metallurgy technology. Mechanical properties were studied by hardness tester and Charpy impact test machine, the effects of braking velocity on friction and wear properties were investigated by MM3000 friction and wear tester, and the micromorphology of friction material was characterized by scanning electron microscope (SEM). The results show that, the friction and wear properties of Cu-based powder metallurgy friction material are related to braking velocity, the friction absorption powers present almost linear growth, and the friction coefficients increase firstly and then decrease with the increase of braking velocity. Softening of copper matrix can destroy the oxide film on friction material surface, reducing the shear strength of molecular bond and increasing wear loss.