【摘要】 采用无压烧结和酸洗的方法制备了α－ＳｉＡｌＯＮ单晶颗粒，并将这些单晶颗粒作为晶种加入到ＹＳｍ－α－ＳｉＡｌＯＮ原始组份中，研究了陶瓷显微结构与性能的变化．结果表明：未加入晶种的ＹＳｍ－α－ＳｉＡｌＯＮ陶瓷主要由细小晶粒和少量粗大晶粒组成，而晶种加入后，陶瓷中出现了柱状晶粒；柱状晶粒的尺寸与数量可由晶种的数量和尺寸控制．晶种加入导致ＹＳｍ－α－ＳｉＡｌＯＮ陶瓷韧性升高，韧性升高的原因与柱状晶粒的拔出与桥接有关．更多还原

【Abstract】 α-SiAlON single crystal particles were obtained by a method of pressureless sintering and subsequent acid treatments. The microstructure of YSm-α-SiAlON ceramics containingα-SiAlON single crystal particles was investigated. The experimental results showed that the specimen without seeding consisted of fine elongated grains and small amount of relatively coarse grains. When specimens were seeded withα-SiAlON single crystal particles, the elongatedα-SiAlON grains presented. The morphology and amount of elongated grains were effected by the seed size & amount. The fracture toughness ofα-SiAlON ceramics with seeding was improved, owing to grain pullout and bridging of elongated grains.更多还原