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空气气氛下采用γ射线辐射氧化联合热交联对聚碳硅烷(PCS)纤维进行了不熔化处理,并热解制备出SiC纤维。研究了辐射氧化、热交联及热解过程中PCS纤维的质量及形貌变化,对SiC纤维进行了分析测试。结果表明,吸收剂量为0.3MGy时可以制备出SiC纤维,吸收剂量为0.5MGy时获得的SiC纤维断裂强度达2.0GPa。利用该法制备的SiC纤维表面光滑,缺陷较少,结晶度较低,电阻率在103Ω·cm级。研究中PCS纤维的吸收剂量范围接近常规辐射加工剂量,具有实际应用价值。
In the air atmosphere, polycarbosilane (PCS) fibers were infusibilized by γ-ray irradiation combined with thermal crosslinking and pyrolyzed to prepare SiC fibers. The quality and morphological changes of PCS fibers during radiation oxidation, thermal crosslinking and pyrolysis were studied. The SiC fibers were analyzed and tested. The results show that the SiC fiber can be prepared at the absorbed dose of 0.3MGy and the breaking strength of SiC fiber reaches 2.0GPa at the absorbed dose of 0.5MGy. The SiC fiber prepared by the method has the advantages of smooth surface, less defects, lower crystallinity and resistivity of 103 Ω · cm. The absorbed dose range of PCS fibers in the study is close to the conventional radiation processing dose, which has practical value.