热处理制度对Li2O-Al2O3-SiO2系统玻璃析晶及热膨胀系数的影响
来源期刊：中南大学学报(自然科学版)2002年第5期
论文作者：刘树江 卢安贤
文章页码：513 - 516
关键词：Li2O-Al2O3-SiO2;微晶玻璃;热处理制度;低热膨胀系数
Key words：Li2O-Al2O3-SiO2;glass-ceramics;heat-treatment;low thermal expansion coefficient
摘 要：采用传统熔融冷却法获得了以P2O5为成核剂的Li2O-Al2O3-SiO2系统基础玻璃,通过差热分析确定了使该玻璃微晶化的热处理条件,并获得了不同热处理温度下Li2O-Al2O3-SiO2系统低膨胀微晶玻璃;利用X射线衍射分析和扫描电子显微镜对晶化试样的物相和微观结构进行了研究;讨论了热处理制度对玻璃的析晶及热膨胀系数的影响.研究结果表明:以P2O5为成核剂,采用不同热处理制度能获得Li2O-Al2O3-SiO2系统低膨胀微晶玻璃;在析晶初始温度下进行热处理,析出β-石英晶体,但晶体生长缓慢,结晶程度低;提高晶化温度,析出β-锂霞石和β-锂辉石晶体且晶体生长迅速.
Abstract: Basic glasses of Li2O-Al2O3-SiO2 system with P2O5 as nucleation agent were prepared by means of conventional melt quenching technology, and the heat-treatment conditions were determined by using DTA. The glass-ceramics with very low thermal expansion coefficient were obtained at different heat-treatment temperatures. The crystalline phases, the microstructure of the glass-ceramics and the influence of heat-treatment on the structure and the thermal properties of the glass-ceramics were investigated according to the X-ray diffraction analysis and the SEM. The results show that the basic glasses in the Li2O-Al2O3-SiO2 systemmay be prepared at lowermelt temperature and the lowexpansion glass-ceramics of Li2O-Al2O3-SiO2 system can also be obtained at different heat-treatment temperatures. The main crystal phase is β-quartz but this crystal grows slowly at the initial crystallization temperature, while β-eucryptite and β-spodumene grow rapidly at higher heat treatment temperature.
