Chemical strengthening method of glass, strengthened glass, application and display device

Abstract

The invention relates to a chemical strengthening method of glass, strengthened glass, application and a display device. The strengthening method of glass comprises the following steps of: carrying out first chemical strengthening treatment on the glass in a first molten salt at a temperature of 360DEG C-440DEG C for 2h-6h, wherein the mass percentage content of sodium nitrate in the first moltensalt is greater than or equal to 20%; carrying out secondary chemical strengthening treatment on the glass in a second molten salt at a temperature of 380DEG C-420DEG C for 1h-4h, wherein the mass percentage of potassium nitrate in the second molten salt is greater than or equal to 80%; and carrying out annealing treatment on the glass at a temperature of 260DEG C-300DEG C for 1h-4h. The glass trengthened by the method is good in mechanical shock resistance and high in falling breaking height, and the situation that a screen or other cover plate glass is broken due to the fact that intelligentequipment like a mobile phone accidentally falls onto the ground can be effectively avoided or reduced.

Description

technical field [0001] The invention relates to the field of glass, in particular to a chemical strengthening method for glass, strengthened glass, application and display device. Background technique [0002] Sheet glass is used, for example, as a cover glass for protecting liquid crystal screens of mobile phones, PDAs (PDAs), digital cameras, and flat panel displays (FPDs) or as cover glasses for casings of portable terminal devices. In recent years, these cellular phones, PDAs, and the like have tended to be thinner and more functional, and require high mechanical strength. Therefore, tempered glass chemically strengthened on a thin glass substrate is used as a cover glass. [0003] This tempered glass is usually chemically strengthened by ion exchange treatment. Ion exchange treatment usually includes: immersing the glass in a molten salt containing potassium and / or sodium at a temperature of 350°C to 550°C, thereby making the sodium ions and lithium ions on the glass ...

AI Technical Summary

Problems solved by technology

[0004] In the traditional technology, the one-step chemical strengthening method usually requires long-term chemical strengthening, which increases the cost of chemical strengthening, and the long-time strengthening treatment makes the ultra-thin glass prone to warping and lowers the yield rate, so it is difficult to prepare chemical toughening with good comprehensive performance. Glass

However, it is difficult to take into account the surface compressive stress value higher than 600MPa and the stress layer depth greater than 20μm by using two or more steps of ion exchange process, which makes it difficult to protect electronic products when the glass is used as the protective glass of electronic products, resulting in careless electronic products. Damage to the screen or cover when dropped

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