Study On The Influence Of Ion Exchange On The Property And Structure Of Thin Glass

Chemical strengthen is an important method of improving the mechanical strength and the abrasive resistance of glass, which can effectively enhance the thin glass and all kinds of glass products. In this paper, the soda-lime silicate thin glass was chemical strengthened by using low temperature ion exchange method,in order to study the suitable technological conditions of chemical strengthen of thin glass. In this paper, the chemical composition of the glass sample surface was investigated by X Ray Fluorescence?XRF?, the ion-exchange thickness of glass cross-section was investigated by energy dispersive spectrometer?EDS?, the micro area morphology characteristics of glass surface was observed by atomic force microscope?AFM?, the vickers-hardness of glass was tested before and after strengthen. In the process of ion-exchange, the effect of the time?temperature?additive and other factors on the mechanical strength of tempered glass was discussed. The results showed that:When toughened agent was pure potassium nitrate, the ion-exchange time was 12 h and the ion-exchange temperature was 450?, the vickers-hardness of glass was 669.54kg·mm^-2, than the original glass increased by 19%. Adding proper additive in the potassium nitrate can improve the tempered hardness and the strengthening effect. When molten salt was added 2wt% potassium fluoride, the vickers-hardness reached 697.59kg·mm^-2, the depth of potassium ion exchange layer was 32?m. When molten salt was added 3wt% potassium acetate, the vickers-hardness of tempered glass reached 694.87kg·mm^-2, the depth of potassium ion exchange layer was 31?m. When molten salt was added 5wt%potassium bicarbonate, the vickers-hardness of glass reached 680.32kg·mm^-2, the depth of potassium ion exchange layer was 28?m. When molten salt respectively was added 3wt% rubidium nitrate and 3wt% rubidium carbonate, the vickershardness of tempered glass respectively reached 712.83kg·mm^-2?727.90kg·mm^-2,the depth of potassium ion exchange layer respectively was 35?m?38?m.After ion exchange reaction, the whole of glass was transparent, the surface and micro area of glass were not corroded. In the process of low temperature ionexchange, raising the temperature and prolonging the time both can promote the ion exchange between potassium and sodium and deepen the exchange layer.Potassium into glass by ion exchanging, the distribution of potassium from the glass surface to the substrate was trapezoidal. The depth of exchange layer was strictly connected to the exchange time ? temperature ? the composition of strengthen agent, and increasing temperature ? prolonging time can increase the depth of exchange layer, but the hardness of glass increase limited. With the extension of time, the ion exchange reaction rate slowed down. The results of the study had reference value for improving the thin chemical strengthen process.