摘要
为了以天然锂辉石为原料制备具有低膨胀性能的微晶玻璃，引入ＭｇＯ、ＺｎＯ、Ｂ２Ｏ３以降低熔制温度，引入ＴｉＯ２作为晶核剂。用ＤＴＡ方法研究了Ｌｉ２Ｏ·Ａｌ２Ｏ３·４ＳｉＯ２系玻璃三种组成的晶化特性，结果表明，引入ＭｇＯ、ＺｎＯ、Ｂ２Ｏ３后使玻璃的Ｔｇ温度下降，同时降低了玻璃的析晶活化能。用Ｏｚａｗａ方程计算了Ａｖｒａｍｉ参数，证明ＴｉＯ２使玻璃整体析晶。
For the preparation of low expansion coefficient glass ceramic derived from natural Spodumene(Li 2O·Al 2O 3·4SiO 2),MgO,ZnO,B 2O 3 were used to decrease the melting temperature and TiO 2 was used as nucleating agent.Crystallization behavior of the three glasses in the system were investigated by DTA.The results showed that MgO,ZnO and B 2O 3 decreased the T g and the activation energy.The computation of the Avrami parameter conformed the effect of TiO 2 as bulk crystallization agent while the initial glass and the glasses with the addition of MgO,ZnO,B 2O 3 were surface crystallization dominated.
关键词
微晶玻璃
晶化
DTA法
DTA method
glass ceramic
crystallization
