采用加氢烧成法脱碳,制备了不同自由碳含量的连续SiC纤维.通过元素分析、红外、X射线衍射和拉伸试验等手段对纤维的脱碳过程、元素组成、微观结构和性能进行了分析.结果表明:加氢烧成通过抑制脱H2反应、促进脱CH4反应而实现有效脱碳,且氢气浓度越高,纤维中的碳含量越低.纤维芯部元素分布均匀,表明该方法可以实现均匀脱碳,但表面出现很薄的富碳层,这是纤维经氢气处理后表面吸附氧形成的富氧层在高温烧成时分解所致.自由碳的脱除引起纤维晶粒长大,密度增加,孔隙率降低,电阻率升高,拉伸强度与拉伸模量提高.近化学计量SiC纤维具有优异的综合性能.
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