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Effects of Heat-Treatment on the Crystallization and Thermal Expansion Coefficient of Li_2O-Al_2O_3-SiO_2 System Glass with High Content of ZnO

LI Tan-ping,ZENG Li-qun,ZHOU Xue-zhong,LIU Jin-cai,TANG Sheng-fei(Hunan Institute of Technology,Hengyang 421008,China)  
Basic glasses of Li_2O-Al_2O_3-SiO_2 system with high content of ZnO,added TiO_2+ZrO_2+P_2O_5 components as compound nucleation agent were prepared by means 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 glassceramics 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.
【Fund】: 湖南省教育厅资助项目(03C027)
【CateGory Index】: TQ171.1
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