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Tetragonal to orthorhombic transformation during mullite formation

Published online by Cambridge University Press:  31 January 2011

Dong X. Li  and
William J. Thomson
Dong X. Li
Affiliation:
Chemical Engineering Department, Washington State University, Pullman, Washington 99164–2710
William J. Thomson
Affiliation:
Chemical Engineering Department, Washington State University, Pullman, Washington 99164–2710
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Abstract

The mullite formation process in both single phase and diphasic sol-gel precursors to mullite was studied using dynamic x-ray diffraction (DXRD). A metastable, tetragonal-like mullite phase was observed in all the single gels at temperatures from 980 °C to 1200 °C, but not in any of the other precursors. The tetragonal to orthorhombic mullite transformation was very slow as the lattice parameters, a and b, split and moved gradually away from each other as a result of a gradual decrease of alumina content in the mullite solid solution with increasing temperature from 1100 °C to 1200 °C. The formation of tetragonal mullite coincides with that of the Al–Si spinel. The occurrence of tetragonal mullite or the spinel (or both) is determined mainly by the processing conditions of the sol-gel precursors.

Type
Articles
Information
Journal of Materials Research , Volume 6 , Issue 4 , April 1991 , pp. 819 - 824
Copyright
Copyright © Materials Research Society 1991

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