EFFECT OF CRYSTALLIZATION OF ALUMINA HYDRATE IN PREPARATION OF ALUMINA-COATED COMPOSITE-PARTICLES

被引：16

作者：

NAKAMURA, H

KATO, A

机构：

[1] Department of Chemical Science and Technology, Faculty of Engineering, Kyushu University, Higashi-ku, Fukuoka, 812, 6-10-1, Hakozaki

来源：

CERAMICS INTERNATIONAL | 1992年 / 18卷 / 03期

关键词：

Composite Materials--Synthesis - Silicon Dioxide;

D O I：

10.1016/0272-8842(92)90096-V

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：

Fine alumina hydrate-coated silica particles, as a precursor of mullite (3Al2O3 . 2SiO2), could be made from the system of colloidal silica suspension in aluminium sulphate aqueous solution with a homogeneous precipitation technique using urea. In this method, it was important to keep the alumina hydrate in a non-crystalline state. When the reaction was continued until high pH to allow the crystallization of alumina hydrate, the hydrate separated from SiO2 particles and the intimate composite structure of both phases was broken. Alumina hydrate-coated SiC whiskers could also be prepared from the system of SiC whiskers suspended in aluminium sulphate aqueous solution by using the same method. In this case, it was also important to keep alumina hydrate in a non-crystalline state to keep the intimate composite structure of SiC whiskers and alumina hydrate.

引用

页码：201 / 206

页数：6