钛酸盐玻璃形成的动力学研究

根据玻璃形成的动力学理论,分析了高 TiO_2含量的钛酸盐玻璃的形成情况。用玻璃的粘度、差热分析等实验数据,计算了不同 TiO_2含量玻璃的 Hruby 值(K_(?))、成核速率(I_v)、晶化活化能(E_c)和临界冷却速率(R_(?))。结果表明,随玻璃组份中 TiO_2含量的增加、B_2O_3量的减少,玻璃的临界冷却速率值增大,玻璃形成趋于困难。含50mol% TiO_2玻璃的 R_c 值约为10~3K/s。

Kinetics Study on Titanate Glass Formation

Based on the kinetics theory of glass formation,the glass-forming tendency oftitanate glasses with high TiO_2 contents was analyzed.From the experimental dataof viscosity and differential thermal analyses,the Hruby's value (K_(?)),the nuclea-tion rate (I_v),the activition energy of crystallization (E_c) and the critical coolingrate (R_c) were calculated.The results show that,as TiO_2 content increases and B_2O_3content decreases in the glasses,the critical cooling rate of the glasses increases,and the glass formation becomes more difficult.The R_c value of the glass containing50 mol% TiO_2 is about 10~3 K/s.