摘要
以TiO2+ZrO2+P2O5为复合成核剂,采用传统熔融冷却法获得了高ZnO含量的Li2O-A l2O3-SiO2系统的基础玻璃。通过差热分析确定了该玻璃的热处理条件、晶化性能,利用梯温炉实验、X射线衍射分析和扫描电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:含10%(质量分数)ZnO的LAS系统样品玻璃最佳核化温度为(710±2)℃,玻璃的晶化活化能E为(275±2)kJ/mol,晶化指数n为3.11±0.2,样品玻璃在较低温度下失透,并且随着晶化温度升高,样品的热膨胀系数加大。
Basic glasses of Li2O -Al2O3 -SiO2 system with high content of ZnO P205 components as compound nucleation agent were prepared by means , added TiO2 ＋ ZrO2 ＋ of conventional melt quenching technology, and the heat - treatment requirement as well as crystallization behavior were determined by using DTA. The crystalline phases, microstructure of the glass - ceramics and the influence of heat - treatment on the structure and the thermal properties of glass - ceramics were investigated according to X - ray diffraction analysis and SEM as well as heat - treatment in gradient temperature furnace. The results show that optimum nucleation temperature of the LAS glass containing 10%（in mass） of ZnO is （710 ±2）℃ ,and the values of crystallization activation energy（E） and crystallization exponent（n） are （275 ±2）kJ/mol and 3.11 ±0.1 respectively. The glass sample was devitrified after heat - treatment at lower temperature and the coefficient of thermal expansion was increased with increasing crystallization temperature.
出处
《玻璃与搪瓷》
CAS
2006年第4期8-12,共5页
Glass & Enamel
基金
湖南省教育厅资助项目(03C027)
