采用物相分析、相对密度测试及显微形貌观察等研究了不同烧结温度下三元碳化物Al4SiC4作为烧结助剂对无压烧结β-SiC的物相组成、相对密度及显微结构的影响.结果表明:在烧结过程中,Al4SiC4在高温下会分解生成铝,铝原子进入β-SiC晶格中促进了β-SiC向α-SiC的转变;而随着烧结温度的升高,烧结体的相对密度增大;随Al4SiC4加入量的增多,烧结体的密度先升后降;在1 900℃下,Al4SiC4的加入量为5％(质量分数)时,烧结体的相对密度最大,结构最致密.
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