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通过化学气相渗透法(CVI)结合反应熔体浸渗法(RMI)制备了三维针刺C/SiC刹车材料,利用MM-1000型摩擦磨损试验机系统研究了C/SiC刹车材料的摩擦磨损性能,采用光学显微镜和扫描电子显微镜分别对摩擦表面和磨屑形貌进行了观察。结果表明:干态刹车条件下,当初始刹车速度相同时,摩擦系数随着刹车压力的升高而逐渐降低;当刹车压力相同时,摩擦系数随着初始刹车速度的增加先升高后降低。湿态摩擦性能衰减小(衰减约8%)、恢复快;静态摩擦系数高(为0.56~0.61),摩擦系数随着初始刹车温度的升高而显著降低。当刹车压力相同时,磨损率随着初始刹车速度的增加而增大;当初始刹车速度大于20 m/s时,刹车压力的增大使磨损率显著增加。
A three-dimensional acupuncture C / SiC brake material was prepared by chemical vapor infiltration (CVI) combined with reactive melt infiltration (RMI). The friction and wear properties of C / SiC brake materials were studied by MM-1000 friction and wear testing machine The friction surface and wear debris morphology were observed by optical microscope and scanning electron microscope respectively. The results show that under the condition of dry braking, when the initial braking speed is the same, the friction coefficient decreases with the increase of braking pressure. When the braking pressure is the same, the friction coefficient increases first and then decreases with the increase of initial braking speed. The wet friction decreases little (about 8% attenuation) and quickly recuperates. The static friction coefficient is high (0.56-0.61), and the friction coefficient decreases significantly with the initial braking temperature. When the brake pressure is the same, the wear rate increases with the initial brake speed. When the initial brake speed is more than 20 m / s, the increase of brake pressure leads to a significant increase of the wear rate.