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Metastable solid solution extension of mullite by rapid solidification

Published online by Cambridge University Press:  31 January 2011

John P. Pollinger  and
Gary L. Messing
John P. Pollinger
Affiliation:
Department of Materials Science and Engineering, Pennsylvania State University, University Park, Pennsylvania 16802
Gary L. Messing
Affiliation:
Department of Materials Science and Engineering, Pennsylvania State University, University Park, Pennsylvania 16802
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Abstract

The melt self-quenching technique has been used to examine the metastable solid solution extension of mullite formed from rapidly solidified Al2O3.SiO2 melts. Increasing melt cooling rates were seen to increase the Al2O3 content of mullite, decrease the amount of mullite precipitating, and decrease the melt compositional range over which mullite forms. The maximum mullite Al2O3 content achieved was 77.3 mol % for cooling rates between 103 and 105 K/s. The highest Al2O3 content mullite also exhibited very similar ao and bo lattice parameters indicating a structure close to tetragonal symmetry (equilibrium mullite is orthorhombic).

Type
Articles
Information
Journal of Materials Research , Volume 3 , Issue 2 , April 1988 , pp. 375 - 379
Copyright
Copyright © Materials Research Society 1988

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