Preparation of Mullite Powders by Sol-Gel Methods

Journal of Inorganic Materials

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Preparation of Mullite Powders by Sol-Gel Methods

JIN Xi-Hai; GAO Lian; GUO Jing-Kun

State Key Lab of High Performance Ceramics and Superfine Microstructures; Shanghai Institute of Ceramics; Shanghai 200050; China

Received:2000-05-25 Revised:2000-07-10 Published:2001-05-20 Online:2001-05-20

Abstract

Abstract: Superfine Al₂O₃-SiO₂gel of mullite composition was prepared by a sol-gel method, using TEOS and aluminium chloride hexahydrates as starting materials. Its mullitization process was monitored by DTA, XRD and IR measurements. The as-received gel is a diphasic one, comprising of bayerite and amorphous silica. By going through transition phases of γ-Al₂O₃ and Al-Si spinel, this gel transforms to mullite at 1250℃. The mullite powder obtained has a very fine grain size and shows a plate-like morphology.

Key words: mullite, sol-gel, XRD, IR

CLC Number:

TQ174

JIN Xi-Hai,GAO Lian,GUO Jing-Kun. Preparation of Mullite Powders by Sol-Gel Methods[J]. Journal of Inorganic Materials.

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Preparation of Mullite Powders by Sol-Gel Methods

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