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Secondary Mullite Formation in Kaolin–Al2O3 Ceramics

Published online by Cambridge University Press:  03 March 2011

Yung-Feng Chen ,
Moo-Chin Wang  and
Min-Hsiung Hon
Yung-Feng Chen*
Affiliation:
Department of Materials Science and Engineering, National Cheng Kung University, Tainan 70101, Taiwan
Moo-Chin Wang
Affiliation:
Department of Mechanical Engineering, National Kaohsiung University of Applied Sciences, Kaohsiung 80782, Taiwan
Min-Hsiung Hon
Affiliation:
Department of Materials Science and Engineering, National Cheng Kung University, Tainan 70101, Taiwan
*
a)Address all correspondence to this author. e-mail address: [email protected]
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Abstract

Secondary mullite has been formed in 60 wt% kaolin–40 wt% Al2O3 ceramics by solution-precipitation in the glassy phase in contact with Al2O3 particle, showing a plate-like morphology, at temperatures above 1673 K. The lattice constant modification of secondary mullite has been determined: the lattice parameters of orthorhombic structure of a, b, and c axes decrease from 8.653, 8.770, and 3.167 Å to 7.958, 8.064, and 2.926 Å, respectively. The Al2O3 content in the secondary mullite crystals increases from 59.69 to 70.41 wt% when the grain width increases from 15 to 40 nm. Both the formation of secondary mullite and its grain growth are intimately related to the presence of the glassy phase originated from impurity (K2O) in the kaolin. Their locations as well as their chemical composition of mullite grains, Al2O3 grains, and glassy phase are provided by the meticulous experiments using high-resolution transmission electron microscopy, selected-area electron diffraction, and energy dispersive spectroscopy techniques.

Keywords

Secondary mulliteKaolinSolution-precipitation
Type
Articles
Information
Journal of Materials Research , Volume 19 , Issue 3 , March 2004 , pp. 806 - 814
Copyright
Copyright © Materials Research Society 2004

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