先驱体转化C_f/SiC复合材料的热膨胀行为研究  

Thermal Expansion of C_f/SiC Composites Fabricated by Precursor Infiltration and Pyrolysis

作　　者：张吉庆[1] 简科[2] 王浩[2] 

机构地区：[1]中国国际工程咨询公司,北京100048 [2]国防科技大学新型陶瓷纤维及其复合材料重点实验室,湖南长沙410073

出　　处：《陶瓷学报》2014年第3期296-299,共4页Journal of Ceramics

基　　金：国防科技大学创新群体资助(编号:CJ12-01-01);国防科技大学校预研项目资助(编号:JC12-01-09)

摘　　要：研究了先驱体转化Cf/SiC复合材料的热膨胀行为。结果表明,先驱体转化Cf/SiC复合材料的热膨胀系数主要与材料结构组成有关。先驱体转化工艺生成的SiC基体结晶程度较差,导致先驱体转化Cf/SiC复合材料热膨胀系数较低。同时由于碳纤维轴向热膨胀系数明显低于碳纤维径向和SiC基体,3D Cf/SiC复合材料x向热膨胀系数低于2D Cf/SiC复合材料;而2D Cf/SiC复合材料x向热膨胀系数又明显低于z向。The thermal expansion of Cf /SiC composites fabricated by precursor infiltration and pyrolysis was studied. The results showed that the coefficient of thermal expansion of Cf/SiC composites was related to the microstructure of the composites. Because the crystallization of SiC matrix derived from precursor pyrolysis was low, the coefficient of thermal expansion（CTE） of Cf/SiC composites was low. At the same time, because the axial CTE of carbon fiber was lower than that of SiC matrix, along x dimension, the CTE of 3D Cf/SiC composites was lower than that of 2D Cf/SiC composites, and the CTE of 2D Cf/SiC composites along x dimension was lower than along z dimension.

关 键 词：CF/SIC复合材料 先驱体转化 热膨胀系数 

分 类 号：TQ174.75[化学工程—陶瓷工业]