尝试以含Al、B、C的化合物为烧结助剂进行了α-SiC粉末的无压烧结,研究了烧结助剂中Al和B的配比、烧结温度、保温时间等因素对烧结体密度和力学性能的影响.结果表明,最佳保温时间为1h;当烧结温度为1850℃以上时,烧结体的相对密度达到了90%;当Al/B=3和4时,烧结体的性能相对较好.XRD显示了Al8B4C7相的存在,表明在烧结过程中反应生成了Al8B4C7,烧结机制是液相烧结.扫描电镜照片显示了断面结构和晶粒形貌.
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