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Thermal Poling of Soda‐Lime Silica Glass with Nonblocking Electrodes—Part 2: Effects on Mechanical and Mechanochemical Properties
Authors:Hongtu He  Jiawei Luo  Linmao Qian  Carlo G. Pantano  Seong H. Kim
Affiliation:1. Tribology Research Institute, National Traction Power Laboratory, Southwest Jiaotong University, Chengdu, China;2. Materials Research Institute, Pennsylvania State University, University Park, Pennsylvania;3. Department of Chemical Engineering, Pennsylvania State University, University Park, Pennsylvania;4. Department of Materials Science and Engineering, Pennsylvania State University, University Park, Pennsylvania
Abstract:The mechanical and mechanochemical properties of soda lime silica (SLS) glass surfaces can vary with the sodium ion (Na+) concentration in the subsurface region. Changes in these properties were studied upon modification of Na+ concentrations in the SLS glass by thermal poling. In Part‐1, it is found that the Na+‐depleted and Na+‐gradient layers could be formed at the anode and cathode sides, respectively. Here in Part‐2, we show that Na+ ions play a pivotal role in the mechanochemical wear property upon lateral shear stress. The Na+‐depleted glass wear more readily as relative humidity (RH) increases, while Na+‐gradient glass becomes resistant to wear at high RH. It is also found that the Na+‐gradient glass surface has a higher elastic modulus and hardness with very little change in fracture toughness compared to the pristine surface. The Na+‐depleted glass surface shows a lower elastic modulus and hardness; but its fracture toughness is significantly improved, which might be due to a larger densification capacity of Na+‐depleted layer.
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