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Chemical strengthening method of glass

A chemical and glass technology, applied in the field of glass processing, can solve the problems of restricting the development of ultra-thin glass, warping, etc., and achieve the effect of reducing warping and avoiding dimensional expansion

Pending Publication Date: 2022-03-01
安徽金龙浩光电科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, chemical strengthening also brings the problem of warping after strengthening, which has become a common problem in the industry and limits the further development of ultra-thin glass

Method used

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  • Chemical strengthening method of glass

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The first preheating: put the original glass sheet with a thickness of 0.2 mm in the preheating furnace, and preheat it for 90 minutes at 380 ° C to obtain the first preheating piece; the first strengthening: put the first preheating The hot piece is immersed in molten salt composed of 70% potassium nitrate and 30% sodium nitrate, and strengthened at 420°C for 120 minutes to obtain the first reinforcement; first annealing: place the first reinforcement in an annealing furnace , annealed at 100°C for 60 minutes to obtain the first annealed piece;

[0016] The second preheating: put the first annealed piece in the preheating furnace, and preheat it at 380°C for 30 minutes to get the second preheated piece; the second strengthening: immerse the second preheated piece in 100 % Potassium nitrate molten salt, strengthened at 410°C for 130 minutes to obtain the second strengthened piece; second annealing: place the second strengthened piece in an annealing furnace and anneal a...

Embodiment 2

[0018] The first preheating: put the original glass sheet with a thickness of 0.5mm in the preheating furnace, and preheat it for 110 minutes at 360°C to obtain the first preheating piece; the first strengthening: put the first preheating The hot piece is immersed in molten salt composed of 65% potassium nitrate and 35% sodium nitrate, and strengthened at 415°C for 125 minutes to obtain the first reinforcement; first annealing: place the first reinforcement in an annealing furnace , annealed at 80°C for 80 minutes to obtain the first annealed piece;

[0019] The second preheating: the first annealed piece is placed in the preheating furnace, preheated at 360 ° C for 50 minutes, and the second preheated piece is obtained; the second strengthening: the second preheated piece is immersed in 100 % Potassium nitrate molten salt, strengthened at 405°C for 135 minutes to obtain the second strengthened piece; second annealing: place the second strengthened piece in an annealing furnac...

Embodiment 3

[0021] The first preheating: put the original glass sheet with a thickness of 1.0mm in the preheating furnace, and preheat it for 70 minutes at 400 ° C to obtain the first preheating piece; the first strengthening: put the first preheating The hot piece is immersed in molten salt composed of 60% potassium chloride and 40% sodium chloride, and strengthened at 425°C for 115 minutes to obtain the first reinforced piece; the first annealing: put the first reinforced piece in annealing In the furnace, anneal at 120°C for 40 minutes to obtain the first annealed piece;

[0022] The second preheating: the first annealed piece is placed in the preheating furnace, and preheated at 400 ° C for 10 minutes to obtain the second preheated piece; the second strengthening: the second preheated piece is immersed in 100 % Potassium chloride molten salt, strengthened at 415°C for 125min to obtain the second strengthened piece; second annealing: put the second strengthened piece in an annealing fu...

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Abstract

The invention provides a chemical strengthening method of glass, which is characterized by comprising the following steps: sequentially carrying out primary preheating, primary strengthening, primary annealing, secondary preheating, secondary strengthening and secondary annealing on a raw glass sheet to obtain chemically strengthened glass, wherein the temperature of the first strengthening is 415-425 DEG C, the strengthening time is 115-125 minutes, the used first molten salt is composed of 60-70 wt% of potassium salt and 15-25 wt% of sodium salt; the second strengthening temperature is 405-415 DEG C, the strengthening time is 125-135 minutes, and the used second molten salt is sylvite. The warpage of the reinforced glass obtained by the method is lower than 0.25 mm, the expansion rate of the boundary dimension is lower than 2%, the surface stress is 810-830 MPa, and the stress depth is 30-35 [mu] m.

Description

technical field [0001] The invention belongs to the technical field of glass processing, in particular to a method for chemically strengthening glass. Background technique [0002] With the wide application of smart phones, tablet computers and portable terminals, smart display panels tend to be lighter and thinner, which promotes the development of cover glass in the direction of thinner thickness, lighter weight and higher strength. The reduction of glass thickness will amplify the adverse effect of defects on the strength of the glass body, resulting in a significant decrease in the mechanical properties of the cover glass. In order to enhance the scratch resistance of the touch screen surface and reduce drop damage, chemical strengthening has become one of the important means of glass reinforcement. . However, chemical strengthening also brings the problem of warping after strengthening, which has become a common problem in the industry and limits the further developmen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C21/00C03B25/02
CPCC03C21/002C03B25/025
Inventor 吴建勇魏中凯
Owner 安徽金龙浩光电科技有限公司