碳纤维增强TiC复合材料的抗热震性能  

Thermal Shock Resistance of Carbon Fiber-Reinforced TiC Composites

作　　者：宋桂明[1] 武英[2] 

机构地区：[1]哈尔滨工业大学材料学院,哈尔滨150001 [2]北京矿冶研究总院,北京100044

出　　处：《材料工程》2001年第12期16-19,共4页Journal of Materials Engineering

摘　　要：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 。The thermal shock resistance of hot pressed TiC composites reinforced by chopped carbon fiber (20vol%) were investigated by evaluating the mechanical and thermophysical properties The results show that with an addition of chopped carbon fibers, the strength and fracture toughness are increased remarkably, and the elastic modulus and thermal expansion coefficient are decreased, therefore, the thermal stress fracture resistance parameter,R, thermal stress damage resistance parameter, R TV ,and thermal stress crack stability parameter, R ST , are all increased The residual strength is decreased significantly when the thermal shock temperature difference, ΔT, is higher than 900℃ The increase of thermal diffusivity of the composites is beneficial to the thermal shock resistance The strengthening mechanism of C f/TiC composites is loading transferring, and the toughening mechanisms are crack bridging and fiber pull out

关 键 词：碳纤维增强TiC复合材料 陶瓷复合材料 碳化钛 碳纤维 抗热震性能 

分 类 号：TB332[一般工业技术—材料科学与工程]