Preparation of Nearly Stoichiometric SiC(Ti) Fibers with Highly Crystalline Microstructure from Polytitanocarbosilane
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Abstract
由聚钛碳硅烷制备高结晶近化学计量比 SiC(Ti)纤维 苟燕子，康伟峰，张庆雨 (国防科技大学空天科学学院, 新型陶瓷纤维及其复合材料重点实验室,长沙 410073) 摘 要: SiC 纤维具有高强度、耐高温、抗氧化等优良性能，可应用于航空航天及高技术装备等重要领域。然而，当 前国产含钛 SiC 纤维的制备温度较低，纤维中仍富含多余的杂质氧和游离碳，严重影响了其耐高温性能。本工作 以低软化点聚碳硅烷(LPCS)和钛酸四丁酯(Ti(OBu)4)为原料合成了聚钛碳硅烷(PTCS)先驱体，所得 PTCS 的钛质量分数在 0.36%~1.81%。然后经过PTCS 熔融纺丝、空气不熔化、热解无机化和高温烧结成功制备了高结晶 近化学计量比的 SiC(Ti)纤维，该纤维的 C、O 元素的质量分数分别为 30.45%和 0.06%，C/Si 约为 1.05，β-SiC 晶 粒尺寸为 100~200 nm。纤维中的 Ti 元素主要以 TiC 相的形式存在，有助于纤维的高温烧结致密化。SiC(Ti
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Research context
OpenAlex topics: Advanced ceramic materials synthesis · Fiber-reinforced polymer composites · Aerogels and thermal insulation
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References (26)
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