Strengthening method and strengthening composition for lithium-containing white ceramic glass

Abstract

The invention provides a strengthening method and a strengthening composition for lithium-containing white ceramic glass. The method includes treating the lithium-containing white ceramic glass by using molten salt consisting of NaNO3. The method further includes adding an additive comprising sodium carbonate and a special adsorbent, wherein the special adsorbent is one or more selected from metasilicic acid, diatomite and alumina, and the dosage of the additive is 100: 0.5-4: 0.1-1 in the weight ratio of the molten salt, sodium carbonate and the special adsorbent. According to the method, lithium ions in molten salt are bound by adding sodium carbonate, so that lithium ions are prevented from returning to white ceramic glass; and in the method, impurities in sodium nitrate molten salt arewrapped and deposited on the bottom of a strengthening furnace by the special adsorbent, so that the service life of the molten salt is greatly prolonged. The method is successfully introduced into mass production, the production efficiency of white ceramic glass strengthening is greatly improved, and the production cost is greatly reduced.

Description

technical field [0001] The invention is used for the chemical strengthening process of white (opaque) ceramic glass used for the back cover or other components of mobile phones, tablet computers, Macs, etc., and specifically relates to a strengthening method and a strengthening composition of lithium-containing white ceramic glass. Background technique [0002] White ceramic glass-ceramic has an appearance and texture that are popular in the market. After chemical strengthening, it has high strength and excellent wear resistance and drop resistance. Therefore, it is widely used in back covers or other components of mobile phones, watches, and tablets. [0003] For example, the white ceramic glass-ceramics developed by Corning is a lithium-based glass, and its chemical strengthening adopts a one-time strengthening process, that is, using 100% sodium nitrate molten salt, and the lithium ions in the glass are exchanged with the sodium ions in the molten salt to be strengthened. ...

AI Technical Summary

Problems solved by technology

[0007] But for the above 100% NaNO 3 For molten salt (the molten salt itself will bring some impurities such as calcium ions or magnesium ions), add the above-mentioned potassium-containing salt (the white ceramic glass contains less sodium ions, and does not need potassium-sodium exchange, so adding it to the molten salt Potassium salts will bring unwanted elements into the product) Obviously not conducive to the overall fortification

Add the above example for Na 2 CO 3 、Na 2 SO 4 and Na 3 PO 4 When at least one addition of NaNO 3 The life of molten salt has not been improved or the life of molten salt has not been improved significantly

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