先驱体转化法制备耐高温Si-Al-C-O纤维  

Preparation of High Temperature Resistance Si-Al-C-O Fibers by Polymer-derived Method

作　　者：郑春满[1] 李效东[1] 余煜玺[1] 曹峰[1] 

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

出　　处：《材料工程》2004年第12期25-28,共4页Journal of Materials Engineering

基　　金：国家自然科学基金资助项目(59972042)

摘　　要：以聚硅碳硅烷(PSCS)与乙酰丙酮铝为原料,在常压高温条件下反应制备出聚铝碳硅烷(PACS),经过熔融纺丝、空气预氧化、烧成等工艺,制备出性能优异的耐高温Si-Al-C-O(KD-A)纤维。研究了PACS纤维组成,预氧化过程中的质量增加、Si—H反应程度、凝胶含量,探讨了氧对KD-A纤维性能的影响;通过元素分析、AES和SEM等一系列分析,研究了KD-A纤维的结构组成以及耐高温性能。研究表明,PACS纤维空气预氧化过程中,主要是Si—H键与氧发生反应生成Si—O—Si交联结构;KD-A纤维的组成SiC1.51O0.31Al0.013耐高温性能明显优于普通SiC纤维,在空气中1000℃下加热100h后,强度保留率达到60%左右。WT5BZ]In order to prepare high temperature resistance Si-Al-C-O (KD-A) fibers, polyalu- minocarbosilane (PACS) was synthesized by reaction of polysilocarbonsilane (PSCS) with Al(AcAc)_3, (AcAc: aletylacetanate) at normal pressure. KD-A fibers with high temperature resistance was obtained by melting spinning of PACS, air curing, pyrolysis at 1300℃. The mass gain, Si—H reaction, gel content of PACS during curing process and the effect of mass gain on properties of KD-A fibers were investigated. The composition and structure of KD-A fibers was examined by measurements of SEM, AES and element analysis. The results showed that the Si—H bond in the molecular structure of PACS reacted with oxygen during the curing process and Si—O—Si bond was created. The empirical formula of KD-A fibers was SiC_~1.51 O_~0.31 Al_~0.013 ,and the high temperature resistant property of KD-A fibers was excellent.

关 键 词：聚铝碳硅烷 耐高温 Si-Al-C-O(KD-A)纤维 

分 类 号：TQ343.6[化学工程—化纤工业]