摘要
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。
3D needled C/SiC brake materials were prepared by a combination of chemical vapor infiltration（CVI） and reactive melt infiltration（RMI）.The tribological properties of the as-manufactured C/SiC composites were systematically studied by MM-1000 tribological tester.The microstructure characteristics of the friction surface and wear debris were observed by optical microscope and SEM,respectively.The results indicate that at the same braking speed the dry friction coefficient falls down with the increase of braking pressure;and at the same braking pressure the dry friction coefficient firstly increases and then decreases with the increase of braking speed.The dry friction coefficient falls down obviously as the initial braking temperature rising.The wet friction coefficient fades down a little（about 8% of the dry friction coefficient） and recovers quickly.The static friction coefficient is about 0.56～0.61.The wear rate arises with the increase of braking speed at the same braking pressure.When the braking speed is more than 20 m/s,the wear rate increases obviously with the increase of braking pressure.
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2010年第2期50-57,共8页
Acta Materiae Compositae Sinica
基金
国家自然科学基金(50672076)
凝固技术国家重点实验室自主研究项目(46-QP-2009)
