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在MM-2000Ⅱ型摩擦试验机上测试了Cu基粉末冶金列车闸瓦片材料在不同制动条件下的摩擦磨损性能。结果表明:试样在900℃退火2 h,晶粒有明显的层错条纹,可形成屏障阻碍位错的运动,使位错湮灭困难;亚晶界或晶界增加,导致晶粒细化,材料硬度提高;随着制动压力的增大,摩擦因数呈现先增大后减小的趋势,总体稳定性较好;磨损量先增加后逐渐趋于稳定。
The friction and wear properties of Cu-based powder metallurgy train brake lining materials under different braking conditions were tested on a MM-2000 Ⅱ friction tester. The results show that when the sample is annealed at 900 ℃ for 2 h, the grain has obvious stratified staggered stripes, which can block the movement of dislocation which makes dislocation annihilation difficult. The subgrain boundaries or grain boundaries increase, resulting in grain refinement, With the increase of brake pressure, the friction coefficient first increases and then decreases, and the overall stability is better. The wear volume first increases and then gradually stabilizes.