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中文摘要：
分别以TiO2和MgO-La2O3复合物为烧结助剂,采用常压烧结工艺制备高纯氧化铝陶瓷。探讨了两类烧结助剂对氧化铝陶瓷显微结构的影响,并分析了其气孔排出过程。结果表明,添加TiO2可以降低高纯氧化铝陶瓷的烧结温度,易发生晶粒二次长大、形成晶内孔。添加MgO-La2O3复合烧结助剂降低烧结温度同时产生第二相物质,阻碍晶界迁移,减小晶粒尺寸,提高坯体致密度。
英文摘要：
High purity alumina ceramic was prepared by pressureless sintering process with TiO2 and MgO-La2O3 composite additives,respectively.Meanwhile,the stomatal discharge process and microstructure of alumina ceramic with two types of sintering acids was investigated.The results indicate that the sintering temperature of high purity alumina ceramic can be decreased and intend to emerge abnormal grain growth and form intracrystalline pores using TiO2 as additive.However,MgO-La2O3 composite additives can reduce the sintering temperature by forming liquid phase and can hinder grain boundary migrate to reduce the grain size and improve the relative density of high purity alumina due to formation of the second phase materials.
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