Flexural stress effect on mechanical and mechanochemical properties of soda lime silicate glass surface
Flexural stress effect on mechanical and mechanochemical properties of soda lime silicate glass surface
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DOI：
10.1111/jace.18250
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发表时间：
2021-11
影响因子：
3.9
通讯作者：
Hongshen Liu;Hongtu He;Zhe Chen;Seong H. Kim
中科院分区：
文献类型：
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作者：
Hongshen Liu;Hongtu He;Zhe Chen;Seong H. Kim
为了阐明机械应力对钠钙硅酸盐（SLS）浮法玻璃耐久性的影响，采用X射线光电子能谱（XPS）、镜面反射红外（SR-IR）光谱、纳米压痕和摩擦测试研究了弯曲应力下的薄玻璃板。采用实验室制造的四点弯曲装置在SLS玻璃的空气侧表面上产生压缩或拉伸应力（约40 MPa）。XPS分析表明，电场诱导的钠离子迁移在压缩和拉伸应力表面都大大增强。Si-O-Si拉伸模式的SR-IR分析显示，硅酸盐网络的结构变形在压缩应力下似乎比拉伸应力下更大。的SLS表面的纳米压痕的弹性和塑性响应显着改变的弯曲应力条件下，即使弯曲应力的大小是小于0.7%的所施加的压痕应力。与无应力表面相比，在90%相对湿度下，在压应力条件下的机械化学磨损抗力恶化，而在拉应力条件下，它只是变得更加分散。尽管施加的弯曲应力非常小，但其对化学和结构性质的影响可能惊人地大。结合本研究中的所有结果和先前发表的工作表明，在纳米压痕和机械化学磨损行为中观察到的变化可能与硅酸盐网络的Si-O键中的应变有关。
As a means to elucidate the mechanical stress effect on the durability of soda lime silicate (SLS) float glass, a thin glass plate under flexural stress was investigated with X‐ray photoelectron spectroscopy (XPS), specular reflectance infrared (SR‐IR) spectroscopy, nanoindentation, and tribo‐testing. A lab‐built four‐point bending rig was employed to create compressive or tensile stress (around 40 MPa) on the air‐side surface of SLS glass. XPS analysis showed that electric field‐induced sodium ion migration is greatly enhanced in both compressive and tensile stress surfaces. The SR‐IR analysis of the Si‐O‐Si stretch mode revealed that the structural distortion of the silicate network appears to be larger under compressive stress than tensile stress. The elastic and plastic responses of the SLS surface to nanoindentation were significantly altered under the flexural stress conditions even though the magnitude of the flexural stress was less than 0.7% of the applied indentation stress. Compared to the stress‐free surface, the resistance to mechanochemical wear at 90% relative humidity deteriorated under the compressive stress condition, while it just became more scattered under the tensile stress condition. Even though the applied flexural stress was very small, its impact on chemical and structural properties could be surprisingly large. Combining all results in this study and previously published works suggested that the changes observed in nanoindentation and mechanochemical wear behaviors may be associated with the strain in the Si‐O bonds of the silicate network.