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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