首周期裂解方式对先驱体转化制备C_f／SiC复合材料性能的影响  

Effect of Pyrolysis Mode of First Cycle on C_f/SiC Composites Fabricated by Precursor Pyrolysis

作　　者：李钒[1] 陈朝辉[1] 王松[1] 郑文伟[1] 

机构地区：[1]国防科技大学新型陶瓷纤维及复合材料国防科技重点实验室,长沙410073

出　　处：《航空材料学报》2006年第2期29-32,共4页Journal of Aeronautical Materials

基　　金：国防预研基金资助项目(51488030105ZS9504)

摘　　要：以聚碳硅烷(PCS)为陶瓷先驱体,采用PIP工艺制备3D—B Cf／SiC复合材料,研究了首周期采用不同裂解方式对基体及材料性能的影响。研究结果表明,首周期采用真空裂解或加压(5MPa)裂解,先驱体的陶瓷产率不同, 加压裂解的陶瓷产率最高,达到67．2％。裂解方式对产物的晶体结构没有明显的影响;首周期采用真空裂解制得的Cf／SiC复合材料性能最优,室温弯曲强度和断裂韧度达到404MPa和20．2MPa·m1/2,分别比采用加压裂解所得材料的性能提高40．7％和42．3％。Three-dimensional braided carbon fiber reinforced SiC composites were fabricated via polycarbosilane infiltration and pyrolysis, and the effects of different pyrolysis modes of the first cycle on the matrix and mechanical properties of Cf/SiC composites were investigated. The results show that the precursor has the highest ceramic yields of 67. 2% in case of gas-pressure pyrolysis and the pyrolysis modes have little effect on crystal structure of matrix. When the first pyrolysis was conducted under vacuum, ...

关 键 词：CF/SIC复合材料 聚碳硅烷 裂解方式 力学性能 

分 类 号：TB332[一般工业技术—材料科学与工程]