Influence of ZrO₂ on sintering and crystallization of CaO-Al₂O₃-SiO₂ glass-ceramics

Abstract

ZrO₂ was added into CaO-Al₂O₃-SiO₂ glass-ceramics and the effect of ZrO₂ on sintering and crystallization of CaO-Al₂O₃-SiO₂ glass ceramics was investigated. The results show that the sintering shrinkage ratio of glass particles decreases with the increase of the content of ZrO₂. ZrO₂ has an unfavourable effect on sintering shrinkage ratio of glass particles. The sintering shrinkage ratio of glass particles increases with the increase of sintering temperature. The increase of sintering temperature favors the decrease of the liquid phase viscosity of glass particles. ZrO₂ has little effect on crystallization of main crystalline phase (β-wollastonite). However, it promotes the crystallization at relatively low temperature.

Keywords

glass-ceramics / ZrO₂ / sintering shrinkage / crystallization

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