Abstract:A Copper matrix friction material was prepared by powder metallurgy method,and the friction and wear properties were investigated on GF150D friction fixed velocity tester,with tin content of 0~14% under the friction velocities range of 200~3 000 r/min and the brake pressures range of 0.38~0.63 MPa.The experimental results show that the friction coefficient of the material is significantly improved with adding tin in the friction material,among which the friction coefficient reaches the highest value when tin content is about 12%.It is because that lower strength of material at low tin content causes lower friction coefficient,while the function of lubrication is increased with over-high amount of tin,which results in the decrease of friction coefficient of the material.The content of tin in the range of 8%~12 % can significantly reduce the wear rate under the condition of high speed friction,which is because that the material strength is improved and the wear durability is increased after adding the tin.The friction coefficient of the material is increased with increasing of brake pressure at low velocity,and is decreased with increasing of brake pressure at high velocity.Under condition of high velocity and great brake pressure,the third body quantity and matrix softening and plasticity are increased due to the increased friction temperature,and the friction coefficient is decreased.