(1. 中南大学 粉末冶金国家重点实验室， 长沙 410083;
2. 国防科技大学一院, 长沙 410073)
摘 要: 将聚二甲基硅烷(PDMS)与聚氯乙烯 (PVC) 共裂解合成碳化硅-碳纤维先驱体， 并经熔融纺丝及不熔化处理， 最后经过烧成制得SiC-C陶瓷纤维， 电阻率小于100 Ω·cm， 而通过聚碳硅烷制得的SiC纤维的电阻率为106 Ω·cm。 结果表明： 采用适当的工艺， 能够从聚二甲基硅烷与聚氯乙烯共裂解出发制备低电阻率并兼具良好力学性能的SiC纤维。
关键字: 碳化硅纤维; 聚碳硅烷; 电阻率
（ 1. State Key Laboratory of Powder Metallurgy,
Central South of University,Changsha 410083, China;
2. Key Lab of CFC, National University of Defence Technology, Changsha 410073, China）
Abstract: The precursor polymer was prepared by means of thermal rearrangement reaction of polyvinylchloride and polydimethylsilane. Through melt spinning, infusibilization and heat treatment at high temperature, fiber with low resistivity was obtained; it shows lower resistivity than the SiC fiber derived from polycarbosilane. It is shown that fibers with low resistivity and mechanical properties could be obtained by polymer co-pyrolyzed.
Key words: SiC fiber; polycarbosilane; resistivity; preparation
