材料
Online ISSN : 1880-7488
Print ISSN : 0514-5163
ISSN-L : 0514-5163
論文
ZnO-Al2O3-SiO2ガラスの結晶化機構
若杉 隆伊藤 雅人岡田 有史湯村 尚史角野 広平
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2017 年 66 巻 6 号 p. 389-392

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The ZnO-Al2O3-SiO2 system is a base system of Bristol glaze which has been used as a traditional glaze. The glass in this system tends to show volume crystallization and is reported to produce transparent glass ceramics in which ZnAl2O4 (gahnite) precipitates. In the crystallization process of ZnO-Al2O3-SiO2 glasses, SiO2 (β-quartz) precipitates occasionally and its precipitation is suppressed by a heat-treatment for nucleation. The precise investigation of the crystallization process showed that ZnAl2Si2O8, precipitates by surface crystallization and a small amount of Zn2SiO4 and Al6Si2O13 by volume crystallization at the first stage of crystallization process. ZnAl2Si2O8 decomposes and Al6Si2O13 reacts with ZnO in the glass to be ZnAl2O4 and SiO2. Since no SiO2 precipitates directly from the glass, the existence of SiO2 means surface crystallization occurred during crystallization.

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