ISSN 0862-5468 (Print), ISSN 1804-5847 (online) 

Ceramics-Silikáty 53, (3) 171 - 179 (2009)

Omar Ali A., Abdel-Hameed Salwa A. M.
Glass Research Department, National Research Centre, Dokki P.C. 12622, Cairo, Egypt

Keywords: Glass, Glass ceramics, Willemite

The crystallization behaviour of some glasses in the CaO–ZnO–Al₂O₃–SiO₂ system was investigated using different heattreatment parameters. Cr₂O₃ and CaF₂ were used as nucleating agents. Differential thermal analysis, X-ray diffraction, dilatometry and scanning electron microscopy were used in this study. Melilite, α- and β-willemite, anorthite, wollastonite, pseudowollastonite and petedunnite phases developed in the investigated glasses. The formation of compatible and incompatible phase assemblages and the effect of Cr₂O₃ and CaF₂ are illustrated. Glass-ceramics with fine-grained microstructures and CTE values ranging from 36 to 73 × 10⁻⁷ K⁻¹ in the 20-700°C range were obtained.

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