以不同配比的Y2O3-Al2O3为烧结助剂,通过添加3wt％的单分散β-Si3N4籽晶,采用气压烧结制备了氮化硅陶瓷,并对所得材料的相组成、密度、室温和高温力学性能及显微结构进行了研究.结果表明:不同烧结助剂配比的α-Si3N4粉体在1800℃保温2h即全部转化为β-Si3N4,且各烧结体的相对密度都达到了97％以上.在6wt％Y2O和4.5wt％Al2O3为烧结助剂时,添加3wt％籽晶的样品其室温强度和1200℃高温强度分别提高了20％和16％,断裂韧性提高了8％.
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