摘要
采用高纯Ａｌ２Ｏ３超细粉末，烧制成掺杂稀土氧化物的Ａｌ２Ｏ３透明陶瓷．以ＥＰＭＡ法观测透明陶瓷晶界处的化学组成及稀土氧化物的定态浓度分布，用非平衡态热力学理论分析晶界偏析行为．研究发现，添加物在Ａｌ２Ｏ３透明陶瓷晶界的浓度分布为非平衡态热力学组成分布，ＭｇＯ，Ｌａ２Ｏ３，Ｙ２Ｏ３富集于晶界，符合定态耦合模型．
Alumina transparent ceramics doped with rare earth oxide were prepared using high purity Al 2O 3 ultrafine powder. The chemical composition at the crystal boundary of transparent ceramics was observed and the concentration distribution of rare earth oxide in stable state was measured by electron microprobe analysis. Solute partial separation behaviour at crystal boundary was analysed using non_equilibrium thermodynamic theory. Based on the study, the concentration distribution of the additive at the crystal boundary of alumina transparent ceramics is the non_equilibrium thermodynamic behaviour. MgO, La 2O 3 and Y 2O 3 are mainly concentrated at the crystal boundary and are in accordance with the coupling model in the stable state.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
1998年第6期802-807,共6页
Journal of The Chinese Ceramic Society
基金
国家自然科学基金
关键词
透明陶瓷
稀土氧化物
晶界
热力学
氧化铝陶瓷
transparent ceramic, rare earth oxide, crystal boundary, concentration distribution, non_equilibrium thermodynamics
