The crystallization of an aluminosilicate glass in the K₂O–Al₂O₃–SiO₂ system

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• 作者：Michael J. Cattell ; Thomas C. Chadwick ; Jonathan C. Knowles and Richard L. Clarke
• 刊名：Dental Materials
• 出版年：2005
• 出版时间：2005
• 年：2005
• 卷：21
• 期：9
• 页码：811-822
• 全文大小：547 K

文摘

Summary

Objectives

The aims of the study were to explore the nucleation and crystallization kinetics of an aluminosilicate glass in K₂O–Al₂O₃–SiO₂ system and to characterize it.

Objectives

A starting glass composition of wt % ; 64.2 % SiO₂, 16.1 % Al₂O₃, 10.9 % K₂O, 4.3 % Na₂O, 1.7 % CaO, 0.5 % LiO and 0.4 % TiO₂ was heated in an electric furnace and later quenched to produce glasses. The glass powders were heat treated using differing heat treatment schedules and quenched. Dta, Xrd, Eds and Sem analyses were used to characterize and explore the crystallization kinetics of the glasses.

Results

Phase separation of the glasses was identified and characterized in the glasses. Tetragonal leucite, cubic leucite and sanadine glass-ceramics were produced. Fine leucite crystals (1 μm²) were crystallized with minimal matrix microcracking.

Significance

Amorphous phase separation appeared to be an important precursor to nucleation and crystal growth in the alkali aluminosilicate glasses explored. It was possible to control the crystallization of tetragonal leucite and sanidine phases by selected heat treatment of glass powders and monoliths, resulting in the production of fine grained tetragonal leucite glass-ceramics.