三维针刺碳/碳化硅陶瓷基复合材料及其摩擦磨损性能  

3d Needle-Punched Carbon/Silicon Carbide Ceramic Matrix Composites and Tribological Properties

作　　者：徐永东[1] 张立同[1] 成来飞[1] 范尚武[1] 袁毅东 张富宽 田广来 陈志军 楼建军[1] 

机构地区：[1]西北工业大学超高温结构复合材料国防科技重点实验室,西安710072 [2]航空一集团514厂,陕西兴平713106

出　　处：《航空材料学报》2007年第1期28-32,共5页Journal of Aeronautical Materials

基　　金：陕西省自然基金(2004E116);教育部跨世纪人才培养计划基金(2002)

摘　　要：采用三维针刺的碳纤维预制体,通过化学气相渗透方法制备具有一定密度的C/C复合材料,然后采用反应熔体浸渗方法进行后续致密化处理,得到高致密度的C/S iC复合材料,系统研究了材料的组织结构特征、刹车性能以及摩擦磨损机理。在纤维束内部每根C纤维单丝之间由化学气相渗透的碳充填形成致密的C/C区域,而在纤维束之间则主要由反应熔体浸渗法生成的S iC、残留S i和C组成。C/S iC复合材料具有非常优异的摩擦磨损性能,摩擦系数变化规律呈典型的马鞍状。平均摩擦系数为0.34,摩擦性能稳定,磨损率低(1.9μm/次.面);摩擦性能几乎不受湿度的影响,湿态衰减仅为2.9%。在摩擦磨损过程中,C/S iC复合材料的表面能够形成连续稳定的摩擦面,磨损表现为典型的磨粒磨损。Carbon/carbon （C/C） composites with certain density were prepared by chemical vapor infiltration （CVI） of the three-dimensional needle-punched carbon fiber preform. By the reactive melt infiltration （RMI） method as a subsequent densification of C/C composites, the highly densified carbon/silicon carbide （C/SiC） composites were finally obtained. The studies on structure characteristics, braking performance as well as friction and wear mechanisms of C/SiC composites were systematically investigated in this paper. It was found that the CVI-carbon which filled the gap between carbon monofilaments in fiber bundles formed dense carbon/carbon region. The material distributed between fiber bundles were silicon carbide derived from RMI, residual silicon and carbon. C/SiC composites show excellent friction and wear behavior with the typical saddle shape of the coefficient of friction （COF） curve. The average COF obtained is 0.34 and the wear rate is low （1.9μm at a time for one side）. The frictional behavior is stable and almost immune to humidity with a decreasing rate of only 2.9% in hygrometric state. In the course of friction and wear, the contact surface of the carbon/ silicon carbide brake disk turned to continuous and stable friction surface and grain-abrasion was the main wear form.

关 键 词：三维针刺 碳/碳化硅复合材料 摩擦磨损性能 

分 类 号：TB332[一般工业技术—材料科学与工程]