化学增强铝硅酸盐玻璃扩散性能研究

了解碱金属离子在玻璃表面的扩散对生产高强度铝硅酸盐系统离子交换玻璃具有重要意义。通过外加Al,讨论不同Al/Na对碱离子扩散影响。采用EPMA测得玻璃断面K+、Na+分布曲线,根据Boltzmann-Matano计算方法得到K+、Na+的扩散系数,根据Arrhenius公式计算得到K+、Na+的扩散活化能。实验证明,随着Al/Na的增加,K+、Na+扩散深度逐渐增加,互扩散系数逐渐增加,K+、Na+平均活化能逐渐增加。讨论玻璃体内Al/Na比例是研究高强度离子交换玻璃的一个重要方向。

The Diffusion Performance of Potassium and Sodium in Ion Exchanged Aluminum Silicate Glass

In the production of ion exchanged aluminum silicate system glass,the alkali ion diffusion on the glass surface is an important process which must be considered.In this paper,we discussed the impact of additional Al on the diffusion of alkali ions.The penetration depth profiles of alkali ions were obtained by EPMA methods.The diffusion coefficients of alkali ions were calculated by Boltzmann-Matano equation.And the active energy of alkali ions were gotten by Arrhenius equation.The results showed that the penetration depth,the interdiffusion coefficient and the average active energy increased with the increase of Al/Na ratios.It means the Al/Na ratios have a great effect on the diffusion of alkali ions.