MICROSTRUCTURAL EVOLUTION IN CLAY-BASED CERAMICS. PT.1. SINGLE COMPONENTS AND BINARY MIXTURES OF CLAY, FLUX, AND QUARTZ FILLER

Microstructural evolution on heating kaolinite clay, quartz, nepheline syenite, and soda-lime-silica (SLS) glass to various temperatures up to 1300 C was investigated in quenched and slowly cooled samples by XRD, thermal analysis and SEM, and by in-situ XRD. In the individual components, the expecte...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 2008-01, Vol.91 (7), p.2264-2271
Main Authors: Tarvornpanich, T, Souza, G P, Lee, W E
Format: Article
Language:English
Online Access:Get full text
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Summary:Microstructural evolution on heating kaolinite clay, quartz, nepheline syenite, and soda-lime-silica (SLS) glass to various temperatures up to 1300 C was investigated in quenched and slowly cooled samples by XRD, thermal analysis and SEM, and by in-situ XRD. In the individual components, the expected behaviour was seen and in SLS glass, devitrification led to crystallisation of cristobalite, quartz, devitrite, and wollastonite, which dissolved at 900-1000 C. Significant effects of each component on microstructural evolution in the other materials were often seen in binary mixtures. For example, in SLS glass and quartz mixtures, devitrification of SLS glass to form cristobalite was delayed and two forms of cristobalite with different morphologies were identified. Albite and plagioclase crystallised on heating kaolin clay and SLS glass mixtures, decreasing the alumina content available for mullite formation. Melting of nepheline syenite promoted reaction with the clay, including accelerated phase dissolution. SLS glass accelerated dissolution of nepheline syenite and prevented leucite formation. 19 refs.
ISSN:0002-7820