Nucleation and Crystallization of Glass-Ceramics from Coal Fly Ash

Abstract:

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The nucleation and crystallization kinetics of glass obtained by melting coal fly ash with additives at 1550°C have been investigated. The optimum heat treatment schedule for the glass was nucleation at 825°C for 60min before crystallization at 962°C for 4h. The activation energy for crystallization of the glass-ceramics, obtained by the DDTA result, was 280.03 kJ/mol, lower than that of glass-ceramics obtained from pure reagents. The low activation energy is caused by impurities in fly ash, serving as nucleation agent. The results of XRD and SEM show that glass-ceramics developed nano-sized spherical wollastonite.

Info:

Periodical:

Key Engineering Materials (Volumes 280-283)

Edited by:

Wei Pan, Jianghong Gong, Chang-Chun Ge and Jing-Feng Li

Pages:

1651-1654

DOI:

10.4028/www.scientific.net/KEM.280-283.1651

Citation:

F. Peng et al., "Nucleation and Crystallization of Glass-Ceramics from Coal Fly Ash", Key Engineering Materials, Vols. 280-283, pp. 1651-1654, 2005

Online since:

February 2007

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Price:

$35.00

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