Thermosetting liquid precursor of SiC and fast-manufacturing of carbon fiber/SiC composites
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摘要: 本文制备了一种液体热固性SiC前驱体(超支化聚碳硅烷,Tri-ImPCS,25℃黏度约为3 000 mPa·s),并进行了高压模塑快速净成型碳纤维/SiC复合材料的工艺探索。液体环氧树脂RE1820(25℃黏度约为500 mPa·s)可以作为Tri-ImPCS的有效固化剂,在室温或较低加热温度(<100℃)固化定型;热固化后的Tri-ImPCS在进行无压烧结时没有发泡现象,能较好的维持形状。在N2气氛中陶瓷化产率较高(以固化前驱体为基准,900℃陶瓷产率为74.8%);Tri-ImPCS的C/Si原子比约为1.26,在微米尺度上C、Si等元素分布均匀。结合预浸料模压和高压注塑工艺,可以实现碳纤维/SiC复合材料坯体的快速致密。Tri-ImPCS是SiC陶瓷基复合材料理想的液态前驱体。Abstract: In this paper, one novel thermosetting liquid precursor for SiC was prepared (hyperbranched polycarbosilane, Tri-ImPCS, with viscosity about 3 000 mP·as at 25℃), and fast net shaping of carbon fiber/SiC composites (CF/SiC) by high pressure injection was primarily investigated. Liquid epoxy RE1820 (viscosity about 500 mP·as at 25℃) acts as effective curing agent of Tri-ImPCS, and thermal cure could proceed at room temperature or comparably low heated conditions (<100℃); thermal pyrolysis of thermally cured precursor under atmospheric pressure results into a non-foamed and shape-changeless ceramic monolith. The ceramic yield of Tri-ImPCS under N2 atmosphere is as high as 74.8% at 900℃ (based on the cured precursor). C and Si elements are uniformly distributed at micro-scale with the atomic ratio of 1.26. Using a joint-process of prepreg molding and high-pressure injection, the fast manufacturing and rapid densification was successfully realized in CF/SiC's processing. The liquid precursor of Tri-ImPCS is an ideal candidate of SiC precursor of SiC matrixed composites.
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Keywords:
- thermal curablity /
- SiC precursor /
- thermal cure /
- ceramization /
- fast-manufacturing
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