Aluminosilicate glass, method for strengthening aluminosilicate glass, and strengthened glass

Abstract

The invention provides aluminosilicate glass, an aluminosilicate glass reinforcing method and reinforced aluminosilicate glass. The aluminosilicate glass is prepared from the following components by molar percent: 60-70% of SiO2, 13-20% of Al2O3, 0-1% of Li2O, 8-17% of Na2O, 0-5% of K2O, 0-2% of CaO, 0-7% of MgO and 0-2% of ZrO2, wherein the total molar content of Li2O, Na2O and K2O is sigma R2O, the total molar content of SiO2 and Al2O3 is sigma XO, the sigma R2O is 12-17%, and the difference of sigma XO and sigma R2O is 60-74%. The aluminosilicate glass provided by the invention can be chemically reinforced at a high temperature.

Description

technical field [0001] The invention relates to aluminosilicate glass, a strengthening method of aluminosilicate glass and strengthened glass. Background technique [0002] In recent years, devices such as smartphones and tablet computers have become more and more popular, and they are showing a trend of thinning and lightweighting. One problem with thinning is that the strength of the glass decreases as the thickness decreases. In order to meet the requirements of use, the display glass must still have high strength at a small thickness. To achieve this, the glass needs to be strengthened. [0003] At present, in the composition of the aluminosilicate glass used, in order to ensure the ion exchange capacity and take into account factors such as glass meltability, formability, and devitrification resistance, the content of alkali metal oxides is relatively high. When strengthening aluminosilicate glass, because the glass is thin, the effect of physical strengthening is no...

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Problems solved by technology

[0006] Since the ion exchange temperature is limited to a lower range (350°C to 430°C), on the one hand, when it is necessary to obtain a larger ion exchange depth, it takes a long time (typically 4h to 10h), and the efficiency is not high ; On the other hand, the ion exchange time is long and it is easy to cause the "stress relaxation" effect, so that some combination of surface compressive stress and exchange depth may not be achieved (that is, when one of them reaches the specified value, the other cannot meet the requirements), The extreme value appears on the surface compressive stress-ion exchange time curve. For the existing aluminosilicate glass, the time corresponding to the extreme point is generally 3h to 5h, and then the surface compressive stress decreases with time. When the ion exchange time continues to prolong After 2h to 3h, the stress relaxes obviously, and the surface compressive stress decreases by 20% to 30%, which affects its application range

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