Effect of fluoride nucleating catalysts on crystallization of cordierite from modified basalt-based glasses

Cordierite-anorthite phases were crystallized from modified basalt-based glasses by adding calculated amounts of reducing agent, TiO 2, kaolin and F − ions in the form of Li, Mg and Al fluorides as nucleated agents. DTA, XRD and SEM were performed to study the crystallization of these glasses. It wa...

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Bibliographic Details
Published in:Journal of the European Ceramic Society 2007, Vol.27 (2), p.1829-1835
Main Authors: El-Shennawi, A.W.A., Morsi, M.M., Abdel-Hameed, S.A.M.
Format: Article
Language:English
Subjects:
Applied sciences
Basalt
Building materials. Ceramics. Glasses
Chemical industry and chemicals
Cordierite
Exact sciences and technology
Fluoride
Glass-Ceramics
Glasses
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Summary:Cordierite-anorthite phases were crystallized from modified basalt-based glasses by adding calculated amounts of reducing agent, TiO 2, kaolin and F − ions in the form of Li, Mg and Al fluorides as nucleated agents. DTA, XRD and SEM were performed to study the crystallization of these glasses. It was noticed that, AlF 3 greatly encourage the formation of anorthite and has an opposite effect on spinel crystallization. The presence of MgF 2 decreases the onset of crystallization and enhance cordierite polymorphs and anorthite while LiF stimulates the crystallization of anorthite, β-quartz solid solutions (ss) and minor spinel. Sequence of crystallization is dependent on heat treatment parameters and type of fluorides added.
ISSN:0955-2219
1873-619X
DOI:10.1016/j.jeurceramsoc.2006.05.062