C/C-SiC复合材料的制备及其湿式摩擦磨损性能研究  

Study on the Fabrication and Wet Friction Performance of C/C-SiC Composites

作　　者：王秀飞[1] 黄启忠[1] 苏哲安[1] 宁克焱[2] 常新[1] 杨鑫[1] 

机构地区：[1]中南大学粉末冶金国家重点实验室,湖南长沙410083 [2]车辆传动国家重点实验室,北京100072

出　　处：《摩擦学学报》2007年第6期534-538,共5页Tribology

基　　金：车辆传动国家重点实验室基金资助项目(51457030105QT7106);国家重点基础研究发展计划(973计划)资助项目(2006CB600901)

摘　　要：采用1700炭纤维针刺毡，经超声振动渗硅、化学气相沉积（CVD）、硅化处理及液相浸渍／炭化新工艺制备SiC呈“岛状”分布的C／C—SiC复合材料，利用偏光显微镜和扫描电子显微镜观察其微观组织结构并分析其形成机制，在MM-1000型湿式摩擦磨损试验机上研究C／C—SiC复合材料的摩擦磨损性能、结果表明：在初始转速恒定的条件下，动摩擦系数随制动比压的增加而逐渐减小；当制动比压恒定时，摩擦系数随初始转速的增加呈现出先增大而后降低的趋势；在本文试验条件下，摩擦系数稳定在0．088～0．126之间；在300次磨损试验后，其磨损量检测值为0．A new manufacturing process was developed to fabricate the C/C-SiC composites. The process is characterized by ultrasonic impregnation of silicon, chemical vapor deposition （CVD） , siliconizing, resin impregnation and carbonization process with needle-punching carbon felt of T700 fiber as the reinforcing material. SEM and PLOM were used to investigate the microstructure, and the forming mechanism was analyzed. The friction and wear behavior of the C/C-SiC composites was comparatively investigated with the MM-1000 wet friction machine by con- ducting inertia testing and constant-velocity friction testing. The results show that the dynamic friction coefficient decreased as the apparent contact pressure increased with the initial rotational speed keeping constant. While keeping brake contact pressure constant, the dynamic friction coefficient decreased as the initial rotational speed increased first and then declined. The friction coefficient of C/C-SiC composites was stabilized in the range 0. 088 - 0. 126, and the measured result of wear rate was 0 after 300 times brake testing.

关 键 词：C/C—SiC复合材料 湿式摩擦材料 超声振动 微观结构 摩擦磨损性能 

分 类 号：TB332[一般工业技术—材料科学与工程] TH117.3[机械工程—机械设计及理论]