锂铝硅系统微晶玻璃的析晶及热处理工艺研究  

Research on Crystallization and Heat Treatment Process of Li_2O-Al_2O_3-SiO_2 Glass-Ceramics

作　　者：赵莹[1] 陆雷[1] 张乐军[1] 王浩[1] 

机构地区：[1]南京工业大学材料科学与工程学院,南京210009

出　　处：《材料导报》2007年第F11期353-356,共4页Materials Reports

摘　　要：制备了Li_2O-Al_2O_3-SiO_2系微晶玻璃,采用差热分析(DTA)、X衍射分析(XRD)、扫描电镜(SEM)等分析手段对该系统微晶玻璃的析晶过程和微观结构进行了研究。通过正交实验讨论了热处理温度及时间对微晶玻璃热膨胀性能的影响。结果表明:可通过热处理工艺来控制晶相的析出,析晶初始温度下首先析出的晶相为β-石英固溶体,随晶化温度升高β-石英固溶体转变为β-锂辉石固溶体。获得较小热膨胀系数的热处理工艺为:核化温度620℃,核化时间1h,晶化温度840℃,晶化时间3h。所获得的微晶玻璃的热膨胀系数为9.5×10^(17)/℃,可作为低膨胀材料使用。The crystallization and microstructure of Li2O-Al2O3-SiO3 system glass-ceramics are studied by DTA,XPD and SEM. By means of orthogonal testing method, the effect of heat treatment temperatures and time on the thermal expansion properties of the glass-ceramics is discussed The results show that heat treatment process could control the precipitation of the crystals. B-quartz solid solution precipitates first at the initial crystallization temperature, then β-spodumene with increasing temperatures. When the glass is heated at nucleation temperature of 620℃ for l h and then at crystallization temperature of 840℃ for 3h,excellent thermal expansion properties （α（0-400℃）= 9.5 × 10^-7/℃ ） could be obtained, and the glass-ceramics could be used as low thermal expansion materials.

关 键 词：锂铝硅系微晶玻璃 热处理 析晶 热膨胀 

分 类 号：TQ171.733[化学工程—玻璃工业] TG161[化学工程—硅酸盐工业]