采用热压烧结-高温气压处理的方法研究了棒状β-Si3N4晶种对La2O3-Y2O3系自增韧Si3N4显微结构和性能的影响.结果表明,加入晶种将在组织中引入粗大柱状β-Si3N4晶粒,分布均匀;随着晶种加入量的增加,粗大柱状β-Si3N4晶粒数量增加,组3织明显粗化.当晶种加入量较小时(10vol%),材料具有较高的断裂韧性(～12MPam1/2),同时保持较高的强度(800～900MPa),而当晶种加入量较大时,则表现为抗弯强度的明显下降.分析表明,大晶粒直径及其面积百分数是影响断裂韧性的主要因素.
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