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Nucleation and crystallization studies of some glasses in the CaO-MgO-Al2O3-SiO2 system

Published online by Cambridge University Press:  05 July 2018

R. C. de Vekey  and
A. J. Majumdar
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Summary

Glass-ceramics based on the mineral cordierite have good mechanical and thermal properties. They can be easily prepared from glasses whose compositions lie in the primary phase field of cordierite on the 5 % CaO plane of the CaO-MgO-SiO2-Al2O3 system. For uniform crystallization in the bulk, addition of a suitable nucleating agent is essential. The addition of 10–12 wt % of TiO2 is considered to be suitable for both ternary and quaternary glasses. During controlled heat treatment of these glasses extensive phase separation occurs. The nucleation and crystallization processes that follow have been studied by differential thermal analysis, X-ray diffraction, and light and electron microscopy. Some of the physical and mechanical properties of these glass-ceramics have been measured.

Type
Research Article
Information
Mineralogical Magazine , Volume 37 , Issue 291 , September 1970 , pp. 771 - 779
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1970

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