研究了SiCO(Al)纤维向SiC(Al)纤维的高温转化过程,并研究了纤维中SiCxOy相的分解特征及不同高温处理方式对纤维结构和烧结致密化的影响.结果表明:纤维中SiCxOy相分解的温度范围为1430～1850℃,当采用连续处理方式处理,即使在1800℃下,纤维芯部SiCxOy相未能彻底分解,且快速分解速率导致纤维中形成粗大结晶颗粒和气孔,无法得到致密的高结晶结构.而在静态条件下处理,可以提高SiCxOy相分解程度.1650℃下保温处理1h后可以完全脱除SiCxOy相,同时保持晶粒均匀.再经过1900℃烧结,即可制得呈致密高结晶结构SiC(Al)纤维.
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