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γ射线辐照不熔化法制备碳化硅纤维及其性能

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Abstract:

在空气中用γ射线辐照聚碳硅烷(polycarbosilane,PCS)先驱丝,利用红外光谱分析、凝胶含量测定、热重分析、氧含量测定和抗拉强度测试等手段研究了辐照前后PCS先驱丝化学结构、凝胶含量、热分解特性以及烧成SiC纤维的微观形貌、氧含量、抗拉强度和高温性能。结果表明经γ射线辐照处理的PCS先驱丝通过形成Si—O—Si和Si—C—Si桥联结构实现不熔化,其凝胶点剂量为1.2MGy,凝胶化剂量为3.0MGy;辐照后先驱丝的陶瓷产率迅速提高,吸收剂量为0.5MGy的先驱丝陶瓷产率达83.2%,随吸收剂量增加陶瓷产率增加趋于缓慢。吸收剂量为3.0MGy时烧成的SiC纤维氧含量达15.1%,抗拉强度达1.8GPa。该SiC纤维在高温热处理时,在1200℃开始发生破坏,1400℃时基本丧失力学性能,纤维开裂严重。

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