Preparation of Nearly Stoichiometric SiC(Ti) Fibers with Highly Crystalline Microstructure from Polytitanocarbosilane

doi:10.15541/jim20240243

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J Inorg Mat ›› 0 DOI: 10.15541/jim20240243

Preparation of Nearly Stoichiometric SiC(Ti) Fibers with Highly Crystalline Microstructure from Polytitanocarbosilane

GOU Yanzi, KANG Weifeng, ZHANG Qingyu

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Abstract

Due to high tensile strength, excellent high-temperature and oxidation resistance, SiC fibers could be applied in many important fields such as aerospace and high-tech equipment. However, the current preparation temperature of domestically produced titanium-containing SiC fibers is relatively low, and the fibers are still rich in excess oxygen and free carbon, which seriously affects their high-temperature resistance. In this work, the polytitanocarbosilane (PTCS) precursor was synthesized by using low-softening-point polycarbosilane (LPCS) and tetrabutyl titanate (Ti(OBu)₄). The mass fraction of titaniumin the precursors was in the range of 0.36%-1.81%. The nearly stoichiometric polycrystalline SiC(Ti) fibers were successfully prepared through PTCS melt-spinning, air curing, pyrolysis and high-temperature sintering. The mass fraction of carbon and oxygen in SiC(Ti) fibers was 30.45% and 0.06%, respectively, with a C/Si ratio of approximately 1.05 and β-SiC grain size of 100-200 nm. The titanium element in SiC(Ti) fibers mainly existed in the form of the TiC phase, which was beneficial to the densification of the fibers during the sintering process. The SiC(Ti) fibers showed smooth and dense surface, exhibiting obvious transgranular fracture. The average tensile strength of SiC(Ti) fibers was 2.04 GPa, and the elastic modulus was 308 GPa. The results of this work could provide important reference for the development of high-performance continuous SiC fibers.

Key words

polytitanocarbosilane / melt spinning / SiC fiber / precursor-derived ceramics / high-temperature sintering

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GOU Yanzi, KANG Weifeng, ZHANG Qingyu. Preparation of Nearly Stoichiometric SiC(Ti) Fibers with Highly Crystalline Microstructure from Polytitanocarbosilane[J]. Journal of Inorganic Materials. 0 https://doi.org/10.15541/jim20240243

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Funding

National Natural Science Foundation of China (52272100); Natural Science Foundation of Hunan Province (2022JJ30662); Fund of Science and Technology on Advanced Ceramic Fibers and Composites Laboratory (WDZC20215250507)