以TiO2、ZrO2为形核剂制备了透明低膨胀锂铝硅系微晶玻璃, 通过测定其等温转变动力学曲线,讨论锂铝硅玻璃析晶及相变与热处理温度和时间的关系, 并采用DTA、XRD和SEM等方法研究锂铝硅微晶玻璃结构和性能的热稳定性. 结果表明, 以β-石英固溶体为主晶相的透明微晶玻璃能在750~900℃较宽的温度范围和较长的时间内保持主晶相和结构的稳定, 850℃保温5h仍具有较高的透光率和极低的热膨胀系数, 性能具有很好的高温稳定性. 材料结构和性能的稳定性均源自钛锆复合形核剂较高的形核效率.
Transparent and low thermal expansion Li2O-Al2O3-SiO2 glass-ceramics were prepared by addition of TiO2 and ZrO2 as nucleation agents. The effects of heat-treatment temperature and time on the crystallization, and phase transition behavior were discussed and the stabilities of microstructure and properties were investigated by DTA, XRD and SEM. Isothermal transformation curve of the LAS glass was also measured. The results show that β-quartz solid solution is stable in the temperature range from 750℃ to 900℃ and in long annealing time. Further more, LAS glass-ceramics have excellent stability in high temperature, which is still transparent and low thermal expansion after heattreated at 850℃ for 5h. The stability of structure and properties mainly attribute to the high nucleation efficiency of the TiO2 and ZrO2 mixed nucleation agents.
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