This study employed thermal poling at 200°C as a means to modify the surface mechanical properties of soda lime silica (SLS) glass. SLS float glass panels were allowed to react with molecules constituting ambient air (H₂O, O₂, N₂) while sodium ions were depleted from the surface region through diffusion into the bulk under an anodic potential. A sample poled in inert gas (Ar) was used for comparison. Systematic analyses of the chemical composition, thickness, silicate network, trapped molecular species, and hydrous species in the sodium‐depleted layers revealed correlations between subsurface structural changes and mechanical properties such as hardness, elastic modulus, and fracture toughness. A silica‐like structure was created in the inert gas environment through restructuring of Si–O–Si bonds at 200°C in the Na‐depleted zone; this occurred far below T_g. This silica‐like surface also showed enhancement of hardness comparable to that of pure silica glass. The anodic thermal poling condition was found so reactive that O₂ and N₂ species can be incorporated into the glass, which also alters the glass structure and mechanical properties. In the case of the anodic surfaces prepared in a humid environment, the glass showed an improved resistance against crack formation, which implies that abundant hydrous species incorporated during thermal poling could be beneficial to improve the toughness.

中文翻译：

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在惰性和反应性环境气体中通过热极化处理的钠钙硅玻璃表面化学结构和力学性能

这项研究采用200°C的热极化方法来改变钠钙硅（SLS）玻璃的表面机械性能。使SLS浮法玻璃面板与构成环境空气（H ₂ O，O ₂，N ₂），而钠离子则通过在阳极电势下扩散到主体中而从表面区域耗尽。使用在惰性气体（Ar）中极化的样品进行比较。对贫钠层中化学成分，厚度，硅酸盐网络，被困分子种类和含水种类的系统分析表明，地下结构变化与机械性能（如硬度，弹性模量和断裂韧性）之间存在相关性。通过在200°C的Na贫化区中重构Si–O–Si键，在惰性气体环境中形成了类似二氧化硅的结构；这发生在远低于T _{g的水平。}这种类似于二氧化硅的表面还显示出与纯石英玻璃相当的硬度增强。发现阳极热极化条件是如此活泼，以至于O ₂N ₂可以掺入玻璃中，这也改变了玻璃的结构和机械性能。在潮湿环境中制备阳极表面的情况下，玻璃显示出提高的抗裂纹形成性，这意味着在热极化过程中掺入的大量水合物种可能有利于提高韧性。