以 Fe为催化剂,采用溶胶-凝胶和碳热还原的方法,制备出具有不同尺寸、不规则的β-SiC颗粒,并用XRD,FTIR,SEM和BET等分析手段对其进行结构表征.结果表明:在1 300 ℃氩气氛中,不使用Fe催化剂,由酚醛树脂和正硅酸乙酯制成的干凝胶经碳热还原不能形成β-SiC,产物主要是无定形炭和SiO2;而使用 Fe催化剂制成的干凝胶则可形成β-SiC.此外,随着Fe用量的增加,β-SiC的颗粒尺寸和平均晶粒度增加,而堆积缺陷密度和比表面积则减小.
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