短碳纤维增韧石英复合材料性能研究  

A Study on Properties of Short Carbon Fiber Reinforced Silica Glass Matrix Composite

作　　者：曹俊[1] 李建保[1] 杨晓战[1] 胡晓清[1] 张大海[2] 黎义[1] 

机构地区：[1]清华大学材料系新型陶瓷与精细工艺国家重点实验室,北京100084 [2]先进功能复合材料技术国防科技重点实验室,北京100076

出　　处：《宇航材料工艺》2003年第6期43-46,共4页Aerospace Materials & Technology

基　　金：国家自然科学基金资助 :5 9972 0 14;5 942 5 0 0 7

摘　　要：以短碳纤维为初始原料 ,采用溶胶—凝胶技术引入SiO2 组分 ,在一定的热压烧结制度下得到致密Cf/SiO2 复合材料 ;研究了其烧结条件、力学性能、线膨胀及烧蚀性能。实验表明 ,基体保持非晶态 ,可达到 99%的致密度 ;随碳纤维含量的增加 ,弯曲强度 (σf)无显著变化 ,断裂韧性 (KⅠC)先升后降 ;线膨胀系数随碳纤维含量增加而增加 ,该材料具有良好的抗热震及耐烧蚀性能。Short carbon fiber reinforced silica glass matrix composites are manufactured under certain particular hot pressed conditions with sol-gel silica and short carbon fibers as raw materials. The sintering conditions, mechanical properties, linear expansion and ablation properties are studied. The matrix remains amorphous and full dense. With increment of carbon fiber content,flexural strength (σ f) is hardly changed, while fracture toughness (K Ⅰc) is up and then dropped down. It is demonstrated that the composite has excellent thermal shock and ablation resistance, and coefficient of linear expansion is increased with the adding of carbon fiber.

关 键 词：Cf/SiO2复合材料 短碳纤维 溶胶-凝胶技术 线膨胀系数 耐烧蚀性能 力学性能 石英 

分 类 号：TB332[一般工业技术—材料科学与工程]