以聚丙稀腈基炭纤维针刺整体毡为预制体,用不同方法制备三种基体的炭/炭复合材料,采用树脂浸渍-固化或化学气相沉积工艺进行表面封孔处理后并对其组织和密封性能进行了研究.结果表明： 炭/炭复合材料的静压泄漏与材料表面封孔方式、材料的密度以及密封介质的压力有关.封孔方式起主要作用,高密度炭/炭复合材料二次及以上的树脂浸渍-固化可以实现静压零泄漏;材料的密度高、密封介质压力小则静压泄漏小;而运转泄漏还与基体炭有关,基体为树脂炭的材料、表面封孔致密、密度高的材料端面泄漏小;5 h运转试验后, 化学气相沉积封孔处理树脂炭基体的炭/炭复合材料磨损量最大,为0.002 5 mm.

C/C composites with different carbon matrix were prepared by three kinds of process,and then surface pores of the composites were sealed by chemical vapor deposition and resin-infiltration-solidification.The sealing performances of the composites were studied.The resuts show the static pressure leakage of the composites relates to the method of sealing surface pore,the density of the composites and the pressure of the sealed medium.The method of sealing surface pore plays main role in sealing,and the leakage for the composites sealed by resin-impregnation-solidification more than two times is zero under the test conditions.The higher the density of the composites,the lower the pressure of the sealed medium,the little the leakage.Besides,running leakage is also related to the matrix carbon of the composites.For the composites with the matrix of resin carbon,the higher the density,the better the sealing of surface pore,the little the leakage during running.The wear loss of the tested composite specimen is little,the most of the loss is only 0.002 5 mm for the sample with resin carbon matrix after running for 5 h.