Effects of heat treatment temperature on crystallization and thermal expansion coefficient of Li2O-Al2O3-SiO2①
来源期刊：中南大学学报(英文版)2004年第3期
论文作者：卢安贤 贾明 刘树江
文章页码：235 - 238
Key words：heat treatment; glass-ceramics; crystallization; thermal expansion coefficient
Abstract: The basic glass of Li2O-Al2O3-SiO2 system using P2O5 as nucleator was prepared by means of conventional melt quenching technology, and the heat-treatment process was determined by using differential thermal analysis. The crystalline phases and the microstructure of the glass-ceramics were investigated by using X-ray diffraction and scanning electron microscopy. The results show that the glass based on Li2O-Al2O3-SiO2 oxides using P2O5 as nucleator can be pre-pared at lower melt temperature of 1 450℃and the glass-ceramics with lower thermal expansion coefficient of 21.6×10-7℃-1can also be obtained at 750℃. The glass-ceramics contain a few crystal phases in which the main crystal phase is β-quartz solid solution and the second crystal phase isβ-spodumene solid solution. When the heat treatment temperature is not higher than 650℃, the transparent glass-ceramics containingβ-quartz solid solution can be prepared.β-quartz solid solution changes intoβ-spodumene solid solution at about 750℃. And the appearance of the glass-ceramics changes from translucent, part opaque to complete opaque with increasing temperature.
