A strengthening process of cover glass

Abstract

A method for strengthening cover glass, comprising the following steps: the first step of strengthening: after the surface of the cover glass to be strengthened is cleaned, it is immersed in ion-exchanged molten salt in a strengthening furnace, and the temperature is controlled at 350-380°C , soak for 4-7 hours, and perform ion exchange. The formula of the molten salt is more than one molten liquid of potassium salt, sodium salt, and lithium salt; the second step of strengthening: control the temperature of the strengthening furnace at 370-400 ° C, Immerse the strengthened cover glass in the first step in the molten salt solution whose formula composition is 70-100:0-30 potassium salt:lithium salt in terms of mass fraction, soak for 1-3 hours, and then put it into an airtight container to cool to room temperature to obtain a strengthened cover glass. The stress depth of the strengthened cover glass is 40-65 μm, the surface stress intensity is 800-1300 MPa, the warpage is less than 0.1 mm, and the external dimension expansion rate is less than 2%.

Description

technical field [0001] The invention belongs to the technical field of chemical industry and relates to a strengthening process of cover glass. Background technique [0002] Cover glass (CoverLens), also known as strengthened optical glass, glass window, strengthened mobile phone lens, etc., is mainly used in the outermost layer of the touch screen. Its main raw material is ultra-thin flat glass, which has been cut, CNC carved, thinned, strengthened, After coating, printing and other processes, it has the functions of impact resistance and scratch resistance. The glass itself is very brittle and fragile, and the cover glass is very thin. The Baidu range is between 0.3-0.8mm. If it is not strengthened or tempered, the cover glass is easy to break under a very small external force, which will affect the cover. Further applications of glass. [0003] Therefore, in the current prior art, in order to meet the various environmental performances required by the glass used in mobi...

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Problems solved by technology

[0008] In order to solve the problems in the prior art of insufficient strengthening of cover glass (low self-favorable parameters), uneven distribution of glass plane stress, and excessive curvature, the present invention proposes a solution based on the following principles. It can effectively improve the CS (stress value) and DOL (stress depth) of the glass cover of the mobile phone and reduce the problem of warpage

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