摘要
采用差热分析、X-射线衍射分析和扫描电镜等分析手段研究了高含量ZnO对Li2O-Al2O3-SiO2系统微晶玻璃晶化和性能的影响。结果表明:随着ZnO由9wt%增加到11wt%,该系统玻璃转变温度降低,晶化峰值温度降低,最佳成核温度从755±2℃降至745±2℃。通过计算,样品的晶化活化能E和晶化指数n分别为303±3(kJ/mol)、286±3(kJ/mol)、278±3(kJ/mol)和2.9±0.2、3.1±0.2、3.4±0.2。说明了ZnO在能降低玻璃熔融温度的同时能促进玻璃晶化,但ZnO含量达到11wt%时,其热膨胀系数发生突变。
The effect of doping with high ZnO content on the nucleation and crystallization of Li20-Al2O3-SiO2 glass-ceramics was investigated by means of DTA, XRD and SEM. The results show that as the addition of ZnO changes from 9wt% to 11wt%, the glass transition temperature and crystallization peak temperature decrease and optimum nucleation temperature decreases from 755±2℃ to 745±2℃. The values of crystallization activation energy（E） and Avra mi exponent（n） are respectively 303＋3 （kJ/mol）, 286±3（kJ/mol）, 278±3（kJ/mol）, and 2.9±0.2, 3.1 ±0.2, 3.3±0.2. The results indicate that the addition of ZnO as flux can not only decrease the fusion temperature of glasses but also promote the crystallization of glasses. However, when the addition of ZnO up to 11 wt%, the coefficient of thermal expansion suddenly changes.
出处
《中国陶瓷工业》
CAS
2006年第2期8-11,共4页
China Ceramic Industry
基金
湖南省教育厅资助科研项目(基金号:03C027)
关键词
LAS
系微晶玻璃
成核
晶化
膨胀系数
LAS system of glass-ceramics, nucleation, crystallization, thermal expansion
