材料科学
烧结
钇
微观结构
陶瓷
制作
透明陶瓷
晶界扩散系数
粒度
晶粒生长
晶界
冶金
降水
粒径
扩散
复合材料
氧化物
化学工程
气象学
病理
工程类
替代医学
物理
热力学
医学
出处
期刊:Journal of Inorganic Materials
[Shanghai Institute of Ceramics]
日期:2008-07-10
卷期号:23 (1): 130-134
被引量:3
标识
DOI:10.3724/sp.j.1077.2008.00130
摘要
Well dispersed yttrium aluminum garnet (YAG) nanopowders with mean particle size of about 50nm synthesized by modified co-precipitation method were used to sinter YAG transparent ceramics with 0.5wt% TEOS as sintering additive by two step sintering process. The samples were first heated to a higher temperature ranging from 1700 ◦ C to 1800 ◦ C, then cooled down to a lower temperature ranging from 1500 ◦ C to 1600 ◦ C, and held at the lower temperature for 10h. Grain-boundary migration is suppressed and grain-boundary diffusion is promoted during the two step sintering process. When the two step sintering temperatures are 1800 ◦ C and 1550 ◦ C, the microstructure of YAG is homogeneous with average grain size of 6µm without abnormal grain growth and the transmittance of the specimen is 72.0%.
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