A Method for Reducing Strength Dispersion of Chemically Strengthened Glass by Temperature Modulation

A technology of strength dispersion and strengthening glass, which is applied in glass tempering, glass manufacturing equipment, manufacturing tools, etc., can solve the problem of low strength dispersion, and achieve the effect of reducing strength dispersion, improving strength and simple process

Active Publication Date: 2015-12-02
BAIMTEC MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, there is no simple and effective chemical strengthening method that can greatly increase the strength of glass and make its strength dispersion small

Method used

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  • A Method for Reducing Strength Dispersion of Chemically Strengthened Glass by Temperature Modulation
  • A Method for Reducing Strength Dispersion of Chemically Strengthened Glass by Temperature Modulation
  • A Method for Reducing Strength Dispersion of Chemically Strengthened Glass by Temperature Modulation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] 100×100×4mm float glass sample, the composition is as follows:

[0018] SiO 2

al 2 o 3

CaO

MgO

Na 2 o

K 2 o

67

5

2.6

9.5

16.4

0.5

[0019] First wash the glass with deionized water, then dry it naturally. Heat the mixture of potassium nitrate, cesium nitrate and sodium nitrate (mass ratio 94%:4%:2%) used for chemical strengthening to T 1 =420°C and keep warm for 24 hours. Then put the dried glass into a chemical strengthening furnace for preheating at 380°C for 2 hours. After the glass is kept warm, it is placed in molten salt for chemical strengthening. Periodic temperature modulation method is adopted during chemical strengthening, T 2 =450°C. In the heating stage, tanα=2, the holding time t1=10h, in the cooling stage, tanβ=15, and the holding time t 2 =8h, after one modulation cycle is completed, take out the glass, cool it with the furnace, wash the glass with deionized water and dry it. ...

Embodiment 2

[0023] 100×100×6mm float glass sample, the composition is as follows:

[0024] SiO 2

al 2 o 3

CaO

MgO

Na 2 o

K 2 o

72

0.5

9.2

3.3

14.5

0.5

[0025] First wash the glass with deionized water, then dry it naturally. The pure potassium nitrate molten salt used for chemical strengthening is heated to T1=410°C and kept for 24 hours. Then put the dried glass into a chemical strengthening furnace for preheating at 380°C for 3 hours. After the glass is kept warm, it is placed in molten salt for chemical strengthening. Periodic temperature modulation method is adopted during chemical strengthening, T2=450℃. In the heating stage, tanα=5, holding time t1=15h, in the cooling stage, tanβ=10, holding time t2=10h, after 3 modulation cycles, take out the glass, cool it with the furnace, wash the glass with deionized water and dry it. The chemically strengthened glass is then tested for flexural strength using the dou...

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Abstract

The invention relates to a method for reducing the chemically strengthened glass strength dispersity, and particularly relates to the method for reducing the chemically strengthened glass strength dispersity through temperature modulation. The invention provides the method of reducing the chemically strengthened glass strength dispersity through the temperature modulation. According to the method, periodicity control of the temperature rising/reducing speed and the heat-preservation temperature is carried out during a chemical strengthening process, so as to reach the purpose of changing the chemically strengthened glass internal potassium ion concentration distribution and the glass surface stress distribution, and thus the glass strength dispersity is reduced. The chemically strengthened glass manufactured by the method not only has the strength greatly increased (about 8-10 times that of annealed glass), but also has the strength dispersity greatly decreased (the Webber modulus is 2 times that of ordinary chemically strengthened glass). The method has the advantages of simple process, easy operation and good process repeatability, and can realize the continuous, stable and batch production.

Description

technical field [0001] The invention relates to a method for reducing the strength dispersion of chemically strengthened glass, in particular to a method for reducing the strength dispersion of chemically strengthened glass through temperature modulation. Background technique [0002] Chemically strengthened glass is a kind of prestressed glass, which uses a chemical method to exchange ions on the glass surface to form a compressive stress layer on the glass surface. The strength of glass is greatly improved after chemical strengthening. The flexural strength of chemically strengthened glass is about 6-10 times that of annealed glass. However, due to many factors affecting the strengthening process and the relatively random defects of the glass itself, the strength dispersion of chemically strengthened glass is relatively large, which is not conducive to the application of chemically strengthened glass in some specific fields. In order to solve the problem of large strengt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03B27/03
Inventor 颜悦姜良宝李晓宇郭新涛厉蕾
Owner BAIMTEC MATERIAL CO LTD
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