Case II diffusion of water in Na 2 O–3SiO 2 glass: Constant tensile stress gradient at the diffusion interface
Case II diffusion of water in Na 2 O–3SiO 2 glass: Constant tensile stress gradient at the diffusion interface
复制标题
案例二水在Na 2 O·3SiO 2 玻璃中的扩散：扩散界面处恒定的拉应力梯度
DOI：
10.1111/ijag.16622
复制
发表时间：
2023
影响因子：
2.1
通讯作者：
Tomozawa, Minoru
中科院分区：
文献类型：
--
作者：
Hausmann, Bronson D.;Tomozawa, Minoru
一些聚合物和氧化物玻璃表现出不寻常的液体或气体扩散，扩散深度随时间呈线性增加，而不是时间依赖性的正常平方根。有许多模型，但很少有实验数据可以帮助澄清玻璃中存在这种现象的原因。三硅酸钠玻璃（Na 2 O-3SiO 2）样品中的残余应力在80°C下在饱和水蒸气环境中按照情况II水扩散进行表征。通过将玻璃的表面溶胀层溶解在水中来去除玻璃的表面溶胀层，并且测量新显露的表面层的双折射率。通过表明三硅酸钠玻璃中的情况II扩散源于该应力梯度，揭示了恒定的负拉伸应力梯度的存在，这表明了更典型的菲克定律浓度依赖性通量。
Some polymers and oxide glasses exhibit unusual diffusion of liquid or gas, with the depth of diffusion exhibiting a linear increase with time, instead of normal square root of time dependence. There have been many models, but very few experimental data that can help clarify the cause of the phenomenon's existence in glass. Residual stress in sodium trisilicate glass (Na2O–3SiO2) samples was characterized following Case II water diffusion at 80°C in a saturated water vapor environment. The surface‐swelled layer of the glass was removed by dissolving it in water, and birefringence of the newly revealed surface layer was measured. The presence of a constant negative tensile stress gradient was revealed by indicating that Case II diffusion in sodium trisilicate glass originates from this stress gradient, which overwhelms the more typical Fick's law concentration‐dependent flux.