SiC纤维常用的先驱体聚碳硅烷价格高昂,为降低成本,本文以聚硅氧烷为硅源、聚丙烯腈为碳源制备改性先驱体,采用先驱体转化陶瓷技术和静电纺丝工艺制备聚合物原纤维,通过紫外辐照和空气热交联进行不熔化处理,再在N2气氛中进行热解制备SiC(O)纤维,并对SiC(O)纤维的微观结构和抗氧化性能进行研究。结果表明：SiC(O)纤维直径为200~300 nm,均匀度好,表面无孔隙,其在600 ℃的抗氧化性能优于C纤维。
Polycarbosilane commonly used precursor for SiC fibers is prohibitively expensive. To mitigate production expenses, this study employs polysiloxane as the silicon source and polyacrylonitrile as the carbon source to prepare a modified precursor. Polymer precursor fibers were fabricated via precursor-derived ceramic technology combined with electrostatic spining. The fibers underwent stabilization through ultraviolet irradiation and air-stabilization followed by pyrolysis in a N2 atmosphere to produce SiC(O) fibers, then the microstructures and oxidation resistance of the SiC(O) fibers were investigated. The results show that the SiC(O) fibers exhibit a diameter of 200-300 nm, excellent uniformity, and pore-free surface. Moreover, their oxidation resistance at 600 ℃ surpasses that of carbon fibers.
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