通过熔融法制备出不同熔体成型速率的锂铝硅(LAS)玻璃, 利用XRD、DTA、IR、SEM等, 研究了成型速率对热处理后微晶玻璃显微结构的影响。结果表明: 成型速率低(1 cm·s-1)的玻璃内部由于冷却慢, 冷却过程中部分Al3+取代了Si4+, 析出了初始晶核, 热处理后转变为白色的β-锂辉石固溶体, 而玻璃表层冷却快, 未出现明显的析晶, 热处理后形成了无色透明的β-石英固溶体; 熔体成型速率高(6 cm·s-1)的玻璃内部冷却也快, 热处理后表层与内部都转变为单一的β-石英固溶体。

Lithium aluminosilicate glass with different melt forming rates were prepared by the melting method. The effect of forming rate on the microstructure of heat-treated glass-ceramics was analyzed using XRD, DTA, IR and SEM techniques. The results show that the replacement of some Al3+ for Si4+ occurred in the interior of glass with low forming rate in the process of slow cooling(1 cm·s-1), which led to the primary nuclei precipitated. The glass interior converted into a white β-spodumene structure after heat treatment. Meanwhile, because of rapid cooling of the glass surface, the nucleation did not occur obviously. A transparent and colorless β-quartz solid solution was formed after heat treatment. High melt forming rate(6 cm·s-1) led to rapid cooling in the interior of glass,too. A single β-quartz solid solution was formed on surface and in interior after heat treament.