中文摘要：

以石墨粉为填料，采用单向加压浸渍一热解制备了多孔C／C复合材料，然后利用反应熔体浸渗法制备低成本针刺毡C／SiC刹车材料，研究了材料的微结构变化及石墨粉对摩擦磨损性能的影响，结果表明：在C／SiC刹车材料中，大量石墨粉分布在纤维束间和胎网层；材料的摩擦系数高且稳定，在10m／s刹车时摩擦系数和稳定系数分别达到最大值为0．60，0．78；添加石墨粉后，材料的摩擦曲线平稳，磨损率及摩擦面温度显著降低。在高速刹车过程中，极易在摩擦面形成一层均匀稳定的摩擦膜，减缓摩擦面直接接触，有利于改善材料的摩擦磨损性能。

英文摘要：

Carbon/carbon （C/C） composite with graphite filler addition was prepared by single-direction pressure and pyrolysis, and then a low-cost needle-punched carbon fiber reinforced carbon/silicon carbide （C/SiC） braking material was prepared by reaction melt infiltration. The tribological properties and microstructures of the composite were investigated. The results showed that the graphite mainly existed inside the short-cut webs and between the fiber bundles. The average coefficient of friction （COF） and the friction stability coefficient were rised to the maximum of 0.60,0.78 at a brake velocity of 10m/s. The COF curve rised smoothly and stably at high braking speed, and the wear rate as well as the friction surface temperature decreased obviously as the addition of the graphite filler. The friction film which could relieve the direct contact between the friction surfaces was easily formed on the friction surface. As a result, the tribological properties of C/SiC braking material were significantly improved.