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Diffusion kinetics of water in glasses and glass-forming melts.

机译：水在玻璃和形成玻璃的熔体中的扩散动力学。

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摘要

The diffusion kinetics for both the entry and removal of water have been studied in a number of commercial and non-commercial glasses at temperatures in the melt and near and within the transformation range. These glasses include: fused silica, float glass, a commercial soda-lime-silica glass, E-glass, and alkali galliosilicate glasses. Effective diffusion coefficients and water solubilities were calculated based on infrared analysis of samples.; The diffusion kinetics of water in fused silica depends upon fictive temperature, forming method, and direction of diffusion. The removal of water from fused silica glasses at low temperatures occurs with a constant activation energy. At temperatures near the transformation range, the diffusion becomes non-Arrhenian.; The diffusion of water in float glass depends upon the direction of diffusion. At temperatures near the transformation range, the diffusion kinetics for the removal of water are Arrhenian from below {dollar}rm Tsb{lcub}g{rcub}{dollar} to temperatures above {dollar}rm Tsb{lcub}g{rcub}{dollar}. The solubility of water in float glass at temperatures near {dollar}rm Tsb{lcub}g{rcub}{dollar} is significantly greater than that in the melt. The solubility of water in the melt increases with temperature.; The effective diffusion coefficients determined in the melt for a second soda-lime silica glass correlate well with those determined near {dollar}rm Tsb{lcub}g{rcub}{dollar}, with Arrhenian diffusion in both temperature ranges. The solubility of water above the liquidus decreases with increasing temperature.; The activation energy for removal of water from E-glass at temperatures near the transformation range is significantly greater than activation energies for water diffusion in other glasses.; Lithium, sodium, and potassium galliosilicate melts with a 1:1 {dollar}rm Rsb2O{dollar}:{dollar}rm Gasb2Osb3{dollar} ratio were equilibrated in one atmosphere of water vapor at {dollar}rm1450spcirc C{dollar}. The rate of hydroxylation increases with decreasing silica content and increasing alkali ion field strength. The activation energy for dehydroxylation in the transformation range increases with decreasing silica content for lithium galliosilicate glasses.
机译：在许多商业和非商业玻璃中，在熔融温度以及转变范围附近和之内，已经研究了水进入和去除的扩散动力学。这些玻璃包括：熔融石英，浮法玻璃，市售钠钙硅玻璃，E玻璃和碱式镓硅酸盐玻璃。根据样品的红外分析计算有效的扩散系数和水溶性。水在熔融石英中的扩散动力学取决于虚拟温度，形成方法和扩散方向。在低温下以恒定的活化能从熔融石英玻璃中除去水。在接近转变范围的温度下，扩散变为非阿里尼安。水在浮法玻璃中的扩散取决于扩散的方向。在接近转变范围的温度下，用于去除水的扩散动力学是从低于{rm} Tsb {lcub} g {rcub} {dollar}到高于{dol} rm Tsb {lcub} g {rcub} {美元}。在{rm} Tsb {lcub} g {rcub} {dol}附近的温度下，水在浮法玻璃中的溶解度明显大于熔体中的溶解度。水在熔体中的溶解度随温度增加。对于第二钠钙硅玻璃，在熔体中确定的有效扩散系数与在rmrm Tsb {lcub} g {rcub} {dollar}附近确定的有效扩散系数密切相关，并且在两个温度范围内均具有阿雷尼扩散。水在液相线上的溶解度随温度升高而降低。在接近转变范围的温度下从电子玻璃中除去水的活化能明显大于其他玻璃中水扩散的活化能。锂，钠和钾的硅酸镓镓熔液的摩尔比为1：1rmsRsb2O {dollar}：rms Gasb2Osb3 {dollar}，并且在一个水蒸气气氛中平衡了{rm1450spcirc C {dollar}。羟基化速率随着二氧化硅含量的减少和碱离子场强度的增加而增加。镓硅酸锂玻璃的二氧化硅含量降低时，转变范围内的脱羟基活化能增加。

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  • 作者

    McGinnis, Peter Bernard.;

  • 作者单位

    Alfred University.;

  • 授予单位 Alfred University.;
  • 学科 Engineering Materials Science.
  • 学位 Ph.D.
  • 年度 1994
  • 页码 352 p.
  • 总页数 352
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 工程材料学;
  • 关键词

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