以聚碳硅烷(PCS)为先驱体,采用聚合物浸渍裂解法(PIP)分别制备得到T300碳纤维和JC2#碳纤维增强C/SiC复合材料。JC2#C/SiC复合材料具有优异的力学性能,抗弯强度和断裂韧性分别达到662MPa和19.5MPa.m1/2;T300 C/SiC复合材料表现出低强度、高脆性,其抗弯强度和断裂韧性不足前者的四分之一。T300 C/SiC复合材料低性能的根本原因在于T300纤维在PCS裂解过程中性能严重下降,复合材料中纤维与基体间存在强界面结合是另一个影响因素。 T300 carbon fibers and JC2 # carbon fiber reinforced C / SiC composites were prepared by using polycarbosilane (PCS) as precursors and by polymer impregnation and pyrolysis (PIP). JC2 # C / SiC composites have excellent mechanical properties, flexural strength and fracture toughness reached 662MPa and 19.5MPa.m1 / 2, respectively. T300 C / SiC composites showed low strength and high brittleness, and their flexural strength and fracture Toughness of the former one-fourth. The fundamental reason for the low performance of T300 C / SiC composites lies in the severe degradation of T300 fibers during PCS cracking and the presence of strong interfacial bonding between the fibers and matrix in the composites is another factor.