摘要
采用10 MeV电子加速器产生的电子束在空气中辐照聚碳硅烷(PCS)先驱丝,研究了吸收剂量对先驱丝的化学结构、凝胶含量、热解特性及烧成SiC纤维抗拉强度的影响。结果表明,在电子束作用下,辐照产物形成了Si—C—Si,Si—O—Si等桥联结构;辐照产物的凝胶含量与陶瓷产率及烧成SiC纤维的抗拉强度都随吸收剂量的增加而增加,先驱丝在吸收剂量为4.0 MGy时,开始产生凝胶,吸收剂量为7.0 MGy和10.0 MGy时,其凝胶含量分别达81%和85%,陶瓷产率分别达80.5%和83.8%,所烧成的SiC纤维抗拉强度分别达1.7 GPa和1.9GPa。
Polycarbosilane（PCS） precursor fibers were irradiated by 10 MeV electron beam in air atmosphere. Chemical structure, gel content, pyrolysis properties, and tensile strength were studied. Results show that bridge structures of Si-O-Si, Si-C-Si are formed in the irradiated products. Gel content, ceramic yield, and tensile strength are increased with the absorbed dose increasing. The fibers begin to form gel at a dose of 4.0 MGy. At the absorbed dose of 7.0 and 10.0 MGy, the gel content are 81% and 85%. The ceramic yield are 80.5% and 83.8%. The tensile strength are 1.7 GPa and 1.9 GPa, respectively.
出处
《核化学与放射化学》
CAS
CSCD
北大核心
2009年第2期104-108,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)
关键词
电子束
辐照
聚碳硅烷先驱丝
SIC纤维
electron beam
irradiation
polycarbosilane precursor fibers
SiC fibers
