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以针刺网胎无纬布为预制体,采用化学气相渗透、树脂浸渍固化炭化、沥青浸渍高压炭化混合致密化工艺,制备C/C密封材料。采用CFT-1型多功能材料表面性能综合测试仪,应用旋转摩擦方式对C/C密封材料摩擦磨损行为进行研究,并采用扫描电镜分析了C/C密封材料磨损面形貌。结果表明:C/C密封材料的摩擦磨损性能与材料制备工艺(热处理温度及表面纤维结构)息息相关。材料摩擦系数在载荷为24 N,转速为1 000 r/min测试条件下,随着热处理温度的升高呈现出递增趋势,摩擦系数范围为0.110~0.201。材料表面不同区域的磨损量相差较大,网胎区域基体含量多,易形成致密摩擦膜,磨损量大(0.2702mm3);无纬布纤维束区域,纤维含量高,磨损量小(0.0256 mm3);磨损量随着热处理温度的升高,逐渐增大。
C / C sealing material was prepared by needle-punched mesh tire without cloth as preform, chemical vapor infiltration, resin-impregnated solidified carbonization and high-pressure bitumen impregnated carbonized densification process. The friction and wear behavior of C / C sealing material was investigated by rotary friction method with CFT-1 multi-functional surface property tester. The wear surface morphology of C / C sealing material was analyzed by scanning electron microscopy. The results show that the friction and wear properties of C / C sealing materials are closely related to the material preparation process (heat treatment temperature and surface fiber structure). The friction coefficient of material increases with the increase of heat treatment temperature under the condition of load of 24 N and rotation speed of 1000 r / min. The coefficient of friction is 0.110 ~ 0.201. The amount of wear in different regions of the surface of the material is quite different, and the matrix content in the mesh tire area is large, forming a dense friction film with a large amount of wear (0.2702mm3). In the area without fiber cloth, the fiber content is high and the wear amount is small (0.0256mm3) ; Wear amount increases with the increase of heat treatment temperature.