高速列车铜基粉末冶金闸片的制备及摩擦磨损性能

摘要

Through the optimization design of material formula, friction blocks of copper-based powder metallurgy brake pad for high-speed train was prepared by the powder metallurgy method, and the physical and mechanical properties were tested.Then a new type of floating brake pad was assembled through the optimization of the pad structure, and the friction and wear properties of the pad were measured.The results show that shear strength of friction blocks for the brake pad was above 7 Mpa.The average friction coefficients of the brake pad was 0.37±0.05 and the average wear loss was 0.126×10-6 cm3·J-1,which met the requirements of the friction and wear properties for brake pad specified by International Railway Union.The braking properties of the tested brake pad also met the requirements of the 350 km·h-1 and above high-speed trains.%通过对材料配方进行优化设计,利用粉末冶金方法制备了高速列车用铜基粉末冶金闸片摩擦块,测试了其物理和力学性能;通过对闸片结构进行优化,组装出新型浮动式结构闸片,测试了闸片的摩擦磨损性能.结果表明:该闸片用摩擦块的剪切强度不小于7 MPa;闸片的平均摩擦因数为0.37±0.05,平均磨损量为0.126×10-6 cm3·J-1,满足国际铁路联盟对闸片摩擦磨损性能的要求;其制动性能也满足速度在350 km·h-1及以上高速列车的要求.