采用XRD和扫描电镜等分析方法,对国产SiC纤维进行氢气气氛下除去游离碳及纤维高温稳定性的实验研究.在氢气气氛下,将国产SiC纤维分别在900,1200,1500℃和1800℃保温4h,随着温度的升高,纤维质量不断流失,同时纤维结构遭到破坏, 但β-SiC晶化转变不明显,表明国产纤维存在较多的因氧的介入所形成的Si-O-C键,从而影响了纤维在氢气气氛下的高温稳定性.
Excess carbon elimination from fibers by H2-treatment and the thermal stability of homemade silicon carbide fibers at high temperature in hydrogen was studied through XRD analysis and SEM observation. Silicon carbide fibers were annealed at 900, 1200, 1500℃ and 1800℃ for 4h in a hydrogen flow atmosphere, respectively. The mass of homemade silicon carbide fibers decreased and a severe damage of fiber microstructure appeared with the increased of annealing temperatures, but the crystallization of β-SiC was very slight. The results indicated that the homemade silicon carbide fiber was rely largely upon the Si-O-C bond which formed with absorption of oxygen, and the thermal stability of homemade silicon carbide fibers at high-temperature in hydrogen atmosphere was affected.
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