Effect of oxygen vacancies on the hot hardness of mullite

被引：9
|
作者：
Pitchford, JE [1 ]
Stearn, RJ [1 ]
Kelly, A [1 ]
Clegg, WJ [1 ]
机构：
[1] Univ Cambridge, Dept Mat, Cambridge CB2 3QZ, England
来源：
JOURNAL OF THE AMERICAN CERAMIC SOCIETY | 2001年 / 84卷 / 05期
关键词：
D O I：
10.1111/j.1151-2916.2001.tb00807.x
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：
The structure of mullite, which has a composition ranging from 3Al(2)O(3). 2SiO(2) to Al2O3. 2SiO(2), contains ordered oxygen vacancies. Sillimanite, Al2O3. SiO2, has a similar structure but with no vacancies. The indentation hardness of polycrystalline mullite (3Al(2)O(3). 2SiO(2)) was measured from room temperature up to 1400 degreesC and compared with that of single-crystal sillimanite (Al2O3. SiO2) up to 1300 degreesC. It was found that both materials show the same variation in hardness with temperature, suggesting that the structures have a similar resistance to plastic deformation, and therefore that the oxygen vacancies in the mullite structure are not the primary cause of mullite's resistance to high-temperature deformation.
引用
收藏
页码：1167 / 1168
页数：2
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