研究影响气压烧结α/β-sialon复相材料相组成、显微结构及力学性能的基本因素.采用三阶段气压烧结α/β-sialon工艺,能有效控制气相分解产物生成,消除样品鼓泡现象,而有利于致密化.研究了Si3N4粒度及相组成、AlN粒度对气压烧结α/β-sialon的烧结、相组成、显微结构及力学性能产生的不同程度影响.细Si3N4原料因氧含量增加,使相组成向β相方向偏移;较细的AlN原料有利于烧结致密化和材料性能的提高,但要防止样品鼓泡现象;较粗的AlN原料因为增加瞬时过饱和度而使材料中出现明显晶粒异常长大现象,而使显微结构部分晶粒粗化.埋粉中添加适量AlN可以有效地消除样品鼓泡,但埋粉中AlN添加量过多,样品失重增大,微气孔增加.
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