通过测量力学性能和热物理性能 ,研究了热压烧结碳纤维增强 Ti C复合材料 (Cf/Ti C,2 0 vol%碳纤维 )的抗热震性能。结果表明 :碳纤维加入到 Ti C基体中 ,提高了复合材料的抗弯强度和断裂韧性 ,降低了复合材料的弹性模量和热膨胀系数 ,进而使得复合材料的抗热震断裂参数 R,抗热震损伤参数 RTV和裂纹稳定性参数 RST都得以提高。复合材料热震残留强度在热震温差超过 90 0℃后迅速下降。复合材料热扩散率的提高有利于抗热震性能的提高。复合材料增强机理是纤维承载 ,韧化机理是纤维桥联和纤维拔出 The thermal shock resistance of hot-pressed carbon fiber reinforced Ti C composites (Cf / Ti C, 20 vol% carbon fiber) was investigated by measuring the mechanical and thermal properties. The results show that the addition of carbon fiber to the TiC matrix increases the flexural strength and fracture toughness of the composites, decreases the elastic modulus and thermal expansion coefficient of the composites, and further improves the thermal shock rupture parameters R, thermal shock resistance Damage parameters RTV and crack stability parameters RST are improved. The thermal shock residual strength of the composite rapidly decreases after the thermal shock temperature difference exceeds 90 0 ℃. The improvement of thermal diffusivity of composite materials is beneficial to the improvement of thermal shock resistance. Composite reinforced mechanism is fiber bearing, toughening mechanism is fiber bridging and fiber pulling out