300 km/h动车组制动闸片低温摩擦性能与微观形貌演变

Low Temperature Friction Performance of the Brake Pad for 300 km/h EMU and Evolution of the Microstructure

为了研究高速动车组制动闸片在低温冰冻环境下的摩擦磨损性能和表面形貌特征,采用1:1制动动力试验台模拟验证300 km/h,-20℃低温冰冻和夹砂环境下制动闸片的摩擦磨损性能,并对试验后制动闸片的表面微观形貌进行研究,结果表明:低温冰冻环境下制动闸片的摩擦因数与制动压力密切相关,随着制动压力的升高摩擦因数逐渐增大;低温冰冻环境下制动闸片的瞬时摩擦因数呈现出“磨合-上升-稳定”的变化趋势。

In order to probe into the friction and wear properties and surface morphology of brake pad for high speed EMU at low temperature freezing environment,an 1:1 braking dynamic test bench is used to simulate and verify the friction and wear performance of the brake pad under 300 km/h,-20℃ and sandy conditions,the following study of the microstructure of the brake pad after the test shows that the friction coefficient and brake pressure of the brake pad is closely related under low temperature freezing conditions,the friction coefficient gradually goes up with the increase of the brake pressure,and the instant friction coefficient of the brake pad under low temperature freezing conditions presents a‘running-in-increase-stable’variation tendency.