【摘要】 Li₂O-Al₂O₃-SiO₂系统微晶玻璃是一种具有耐高温、耐热冲击、热膨胀系数低等性能的新型玻璃材料,受到科研人员的广泛关注。通过改变Li2O-Al₂O₃-SiO₂系统微晶玻璃的基础配方以及热处理制度,制备了具有较低热膨胀系数的Li₂O-Al₂O₃-SiO₂系统微晶玻璃。结合运用差热热重、X射线衍射、扫描电镜等测试分析方法,研究性能与其组分、微观结构和热处理制度之间的相互联系。结果表明:通过对热处理制度的调整,促进了玻璃的析晶过程,核化温度和晶化温度有所降低。玻璃析出的主晶相为Li_XAl_XSi_1-XO2,最低热膨胀系数达到25.365×10^-7℃^-1。更多还原

【Abstract】 Lithium aluminum silicate（LAS） system is a kind of new materials with low expansion,high temperature resistance,heat shock and other special properties,and more and more attention of researchers at home and abroad. In this paper,by changing the basic composition and heat treatment system of LAS system glass-ceramics,the relationship between the composition, heat treatment system, microstructure and special properties were studied, combining with the DAT,XRD,SEM and other microstructure test analysis method. Through the experiment,reasonable composition and heat treatment were determined,and the glass ceramics with low thermal expansion coefficient were prepared.The results showed that:through the development of reasonable heat treatment process,the melting temperature and crystallization temperature of the base glass are obviously decreased,and the crystallization process of the glass ceramics was promoted. In the experiment, transparent glass ceramics with Li_XAl_XSi_1-XO₂ as the main crystal phase were obtained,and the lowest thermal expansion coefficient was 25.365×10-7℃-1.更多还原