Effects of OH− anion additive concentration in nitrate salt baths on chemical strengthening of Li2O–Al2O3–SiO2 (LAS) glass |
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| Affiliation: | 1. Department of Materials and Ceramics Engineering, University of Aveiro, CICECO, 3810-193 Aveiro, Portugal;2. Turin Polytechnic University in Tashkent, 17, Small ring, 100095 Tashkent, Uzbekistan;3. UIDM, ESTG, Polytechnic Institute of Viana do Castelo, 4900 Viana do Castelo, Portugal;1. State Key Laboratory of Advanced Technology for Float Glass, Bengbu, Anhui, 233000, China;2. Silica-based Materials Laboratory of Anhui Province, Bengbu, Anhui, 233000, China;3. Second People''s Hospital of Bengbu City, Bengbu, Anhui, 233000, China;1. School of Materials Science and Engineering, Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials, Shaanxi University of Science and Technology, Xian, Shaanxi 710021, China;2. State Key Laboratory for Mechanical Behavior of Materials, Xian Jiaotong University, Xian, Shaanxi 710049, China;1. Université Libre de Bruxelles, 4MAT Department, CP165/63, Avenue F. Roosevelt 50, B-1050 Brussels, Belgium;2. University of California at Davis, Dept. of Materials Science & Engineering, Davis, CA 95616, USA;3. AGC Glass Europe, Technovation Centre, Rue Louis Blériot 12, B-6041 Gosselies, Belgium;1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;2. Key Lab. of Power Batteries & Relative Materials, Jiangxi Prov., Jiangxi University of Science & Technology, Ganzhou 341000, China |
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| Abstract: | Two ion-exchange processes of K+-Na+ and Na+-Li+ were used to strengthen LAS glass materials, and the effects of OH− anion additive (introduced by hydroxide additive) in molten salt baths were investigated. The K+-Na+ ion-exchange was superior than Na+-Li+ ion-exchange in the strength enhancement, and with the hydroxide additive, the thickness of ion-exchange layer, the ion-exchange rate and the flexural strength of LAS glass specimens were enhanced remarkably. In detail, for two ion-exchange processes, the optimized ion-exchange time decreased from 24 h to 2 h and from 6 h to 1 h, and the thickness of ion-exchange layer increased from 16 μm to 22 μm and from 23 μm to 34 μm, respectively. Consequently, the corresponding optimized flexural strength increased from 360 MPa to 520 MPa and from 270 MPa to 460 MPa, attributing to the increased thickness of ion-exchange layer and the increased concentration of alkali ions. It is believed that the broken chemical bonds along with the depolymerized glass network induced by OH− anion decreased the diffusion activation energy Ea and increased the diffusion coefficient D of alkali ions for ion-exchange, and thereby the chemical strengthening process of LAS glass materials was improved. |
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| Keywords: | Ion-exchange LAS glass Chemical strengthening Depolymerized reaction |
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