Preparation of alumina ceramic by κ-Al2O3

被引：6
|
作者：
Hao, Zijing [1 ]
Wu, Bolin [1 ]
Wu, Tingting [1 ]
机构：
[1] Guilin Univ Technol, Coll Mat Sci & Engn, Guilin 541004, Guangxi, Peoples R China
来源：
CERAMICS INTERNATIONAL | 2018年 / 44卷 / 07期
基金：
中国国家自然科学基金;
关键词：
Alumina ceramics; kappa-Al2O3; alpha-Al2O3; Cold isostatic pressing; AL2O3; MICROSTRUCTURE; FABRICATION; TRANSITION; POWDERS; BODIES;
D O I：
10.1016/j.ceramint.2018.01.235
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
This work aims to use kappa-Al2O3 transition alumina to prepare alumina ceramics without cracks. It is found that the major reason for the cracking of kappa-Al2O3 sintered bodies formed by traditional wet molding process is the inner stress in green bodies rather than the volume reduction during the kappa-Al2O3 alpha-Al2O3 phase transformation. The cold isostatic pressing can be used to eliminate the inner stress generated in the green bodies, the sintered bodies have no cracks and possess the microstructure which is close to that of the alpha-Al2O3 ceramic products formed by wet molding process. Due to the fact that the calcining temperature of kappa-Al2O3 is much lower than that of alpha-Al2O3 (1050 degrees C in comparison with 1400 degrees C), the application of kappa-Al2O3 can lower the production cost significantly.
引用
收藏
页码：7963 / 7966
页数：4
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