Compositional effects on long-term dissolution of borosilicate glass
Compositional effects on long-term dissolution of borosilicate glass
复制标题
成分对硼硅酸盐玻璃长期溶解的影响
DOI：
10.1016/s0022-3093(00)00154-x
复制
发表时间：
2000
影响因子：
3.5
通讯作者：
T. L. Croak
中科院分区：
文献类型：
--
作者：
D. Strachan;T. L. Croak
已经进行了计算，以确定为什么在静态溶解试验中，实验观察到的沸石（如安铝）的形成会导致某些玻璃的溶解速度迅速增加，而另一些则不会。用一系列简单玻璃的计算结果表明，铝的含量与玻璃的铝含量有很强的相关性。当Si/(Si+Al)比<0.7时，使铝铝酸盐溶解速率增加所需溶解的玻璃量比Si/(Si+Al)比高的玻璃少100-1000倍。其他玻璃成分，如Na、Ca、B和Li，在改变溶解速度方面效果较差，尽管玻璃中需要存在最少量的Na才能形成铝离子。这些效应可以通过使用一个简单的六组分玻璃来计算，尽管实验验证是必要的，以表明可以使用六组分玻璃。我们还讨论了为什么在实验上难以确定铝矾沉淀对溶液中硅浓度的影响。
Calculations have been performed to determine why, in static dissolution tests, the experimentally observed formation of a zeolite, such as analcime, causes a rapid increase in the dissolution rate for some glasses but not for others. The results of these calculations with a series of simple glasses show that there is a strong dependence on the Al content of the glass. For ratios of Si/(Si+Al)<0.7, the amount of glass that has to dissolve for analcime to cause the dissolution rate to increase is 100–1000 times less than for glasses with higher ratios of Si/(Si+Al). Other glass components such as Na, Ca, B and Li are less effective at changing the rate of dissolution, although a minimum amount of Na needs to be present in the glass for analcime to form. These effects may be calculated for multi-component glasses by use of a simple six-component glass, although experimental verification is necessary to show that a six-component glass can be used. We also discuss the reasons why the effect of analcime precipitation on the silicon concentration in solution may be experimentally difficult to determine.