Formation of mullite from mechanochemically activated oxides and hydroxides

被引:35
作者
Temuujin, J
Okada, K
MacKenzie, KJD
机构
[1] Tokyo Inst Technol, Dept Inorgan Mat, Meguro Ku, Tokyo 152, Japan
[2] Mongolian Acad Sci, Inst Chem, Ulaanbaatar, Mongolia
[3] Ind Res Ltd, Lower Hutt, New Zealand
关键词
D O I
10.1016/S0955-2219(98)00002-8
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 formation of mullite from different precursors prepared by a mechanochemical method were investigated. The structural changes caused by grinding various oxide/hydroxide mixtures were characterized by the Si-29 and Al-27 MAS-NMR, FTIR, DTA and XRD. Thermal treatment of precursors prepared by mechanochemical activation from gibbsite and silica gel led to the crystallization of mullite at approximate to 1200 degrees C via a spinel-phase, while precursors prepared from alpha-Al2O3 and silica gel or gibbsite and fused silica formed mullite at about 1400 degrees C by solid state reaction between alpha-Al2O3 and cristobalite. MAS-NMR spectroscopy shows that the crystallization of mullite at lower temperatures is associated with good homogeneity, as judged by the amount of Si present in the aluminosilicate resonances. (C) 1998 Elsevier Science Limited. All rights reserved.
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页码:831 / 835
页数:5
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