研究了用La2O3:Y2O3=4:1作SiC陶瓷的烧结助剂,同时添加Al2O3改变液相的性质.研究发现:该添加剂系统能有效地降低碳化硅陶瓷的烧结温度,Al2O3的引入提高了液相与碳化硅颗粒的反应性,增加了液相对碳化硅颗粒的润湿性,从而对促进碳化硅的烧结十分有利.烧结温度为1850℃,Al2O3:La2O3:Y2O3=4:4.8:1.2(摩尔)时烧结的碳化硅陶瓷具有最佳性能.
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