增强铁粉对货车制动器用铜基摩擦片摩擦磨损性能的影响

Effect of reinforcing iron powder on the friction and wear performance of the copper base friction plate for truck brake

通过热压烧结的方法将Fe粉添加到铜基体中,并测试其对基体产生的增强效果,通过实验测试摩擦片试样的摩擦性能与微观组织形貌。结果表明:当载荷上升后,A1与A2试样的摩擦因数明显变大,A3与A4摩擦因数表现为随载荷的增加而增大。A2摩擦稳定性优于A1,A3与A4试样的摩擦因数随着制动速度增大而降低。A1具有比A2更小的磨损率,A3与A4的磨损率表现为随制动速度的增大而上升,在高速下磨损率更高。A2具备更加紧致的机械混合层(MML),在摩擦表面形成了许多粘着坑,表现为粘着磨损的特点。A3试样表面比A4表面形成了更多的裂纹与磨屑。

Fe powder was added to the copper matrix by hot pressing sintering,and its reinforcement effect on the matrix was tested.The microstructure and friction properties of the friction samples were tested by experiments.The results show that the friction coefficients of A1 and A2 specimens increase obviously with the increase of load,and the friction coefficients of A3 and A4 increase with the increase of load.The friction stability of A2 is better than A1.The friction coefficient of A3 and A4 decreases with the increase of braking speed.A1 has a smaller wear rate than A2.The wear rate of A3 and A4 increases with the increase of braking speed,and achieves a higher wear rate at high speed.A2 has a more compact mechanical mixing layer,which forms many adhesion pits on the friction surface,showing the characteristics of adhesion wear.The surface of A3 specimen has more cracks and debris than that of A4 specimen.