以工业级Si粉(d50=27.25 μm)和石墨(≤0.15 mm)为原料,按n(c):n(Si)=1:1配比后,分别外加0.05 mol的硝酸铁(Fe(NO3)3·9H2O)、硝酸钴(Co(NO3)2·6H2O)和硫化铜(CuS·H2O)作为催化剂,以树脂为结合剂压制成试样,在真空碳管炉中于Ar气保护下在1 100～1 500℃分别保温3 h合成了SiC纤维,并用XRD分析烧后试样的相组成,通过SEM观察产物中SiC的晶体形貌.结果表明:SiC的生成量随温度的升高而增加,尤其在1 400～1 500℃时SiC生成量骤增;1 200～1 400℃烧后,以硫化铜为催化剂的试样中SiC晶体的生成量最大,并在1 400℃时生长成长纤维;在1 500℃下,由于有大量Si熔体存在,催化剂对SiC生成量的影响甚微.
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