空气中γ射线辐照聚碳硅烷陶瓷先驱丝热解合成SiC纤维  

Fabrication of SiC Fibers by Pyrolysis of Polycarbosilane Precursor Fibers by γ-Ray Irradiation Under the Open Air Atmosphere

作　　者：黎阳[1] 许云书[2] 徐光亮[1] 熊亮萍[2] 夏修龙[2] 

机构地区：[1]西南科技大学材料科学与工程学院,四川绵阳621010 [2]中国工程物理研究院核物理与化学研究所,四川绵阳621900

出　　处：《核化学与放射化学》2007年第3期166-170,共5页Journal of Nuclear and Radiochemistry

基　　金：中国工程物理研究院科学技术基金重大资助项目(2004Z0502)

摘　　要：将聚碳硅烷(PCS)陶瓷先驱丝在开放空气中用γ射线辐照,然后在惰性气氛中高温热解制备出SiC纤维。研究了吸收剂量对先驱丝的结构、热分解特性以及热解产物微观形貌的影响。结果表明,在辐射作用下,空气中的氧与PCS中的部分Si—H发生氧化反应生成Si—OH,同时辐照产物中还形成了Si—C—Si,Si—O—Si等桥联结构。吸收剂量为0.5 MGy时,PCS先驱丝在热解过程中没有并丝;吸收剂量为3.0 MGy时,PCS先驱丝的凝胶含量和陶瓷产率分别达到75%和85.17%。这说明开放的空气气氛能够有效降低PCS先驱丝的不熔化处理剂量。Polycarbosilane （PCS） precursor fibers were irradiated by γ-ray under the open air at- mosphere,and then the fibers were converted to SiC ceramics fibers in inert atmosphere at high temperature. The chemical structure, microstructure and pyrolysis characteristic were studied. The results show that the oxygen in air reacts with some Si-H bonds in the PCS, bridge structures of Si-C-Si and Si-O-Si are formed in the irradiated products. The PCS fibers at the dose of 0. 5 MGy are infusible in the process of sintering, at the dose of 3.0 MGy the gel content and ceramic yield are 75% and 85.17% ,respectively. The open air atmosphere can effectively reduce the curing dose.

关 键 词：Γ射线辐照 聚碳硅烷陶瓷先驱丝 不熔化处理 SIC纤维 

分 类 号：O613.34[理学—无机化学]