Effects of alkali oxides and ion-exchange on the structure of zinc-alumino-silicate glasses and glass-ceramics |
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| Affiliation: | 1. State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, China;2. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China;1. State Key Laboratory of Automotive Simulation and Control, Jilin University, PR China;2. Key Laboratory of Automobile Materials (Ministry of Education), School of Materials Science and Engineering, Jilin University, No. 5988 Renmin Street, Changchun, 130022, PR China;1. Guangxi Universities Key Laboratory of Non-Ferrous Metal Oxide Electronic Functional Materials and Devices, College of Material Science and Engineering, Guilin University of Technology, Guilin, 541004, China;2. Guangxi Key Laboratory of Optical and Electronic Materials and Devices, College of Material Science and Engineering, Guilin University of Technology, Guilin, 541004, China;3. Key Laboratory of Nonferrous Materials and New Processing Technology, Ministry of Education, Guilin University of Technology, Guilin, 541004, China;1. State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an, 710049, China;2. State Key Laboratory of Military Stomatology, Department of Prosthodontics, School of Stomatology, Fourth Military Medical University, Xi’an, 710032, China;3. School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China |
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| Abstract: | Types and contents of alkali metal ions play important role on crystallization and ion-exchange properties in glasses. In this work, effects of Na2O/K2O ratio on crystallization and ion-exchange properties of zinc-alumino-silicate glasses were investigated. The crystalline phases precipitated in glasses changes from ZnO to β-Zn2SiO4 with the progressive replacement of K2O by Na2O in parent glasses. Ion-exchange depth of layer (DOL) decreases gradually with the increase in Na2O content in parent glasses. Precipitation of ZnO and β-Zn2SiO4 nanocrystals facilitated the ion-exchange and enlarged the DOL. Na+ and K+ ions were doped into ZnO and β-Zn2SiO4 nanocrystals during heat-treatment, and the extent of doping was facilitated by ion-exchange. Vickers hardness were improved significantly with the crystallization and ion-exchange. Results reported here are valuable for the controlled preparation and chemical strengthening of ZnO and β-Zn2SiO4 glass-ceramics. |
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| Keywords: | Glass-ceramic ZnO Glass structure Ion-exchange |
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