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Chemically reinforced glass and method for production thereof

A technology for strengthening glass and manufacturing methods, which is applied in the field of chemical strengthening glass, and can solve the problems of high destructive strength of glass, impossible cutting, difficult cutting, etc.

Inactive Publication Date: 2006-04-12
CENT GLASS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] That is, regardless of air-cooled strengthened glass or chemically strengthened glass, the breaking strength of glass is high
In addition, in the case of air-cooled strengthened glass, it is impossible to cut, and in the case of chemically strengthened glass, even if it is possible to cut, it is difficult to cut.

Method used

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  • Chemically reinforced glass and method for production thereof
  • Chemically reinforced glass and method for production thereof
  • Chemically reinforced glass and method for production thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] Soda-lime float glass with a thickness of 0.7mm is immersed in potassium nitrate molten salt at 460°C for 10 hours for ion exchange treatment, then the chemically strengthened glass is moved to a cooling tank set at 510°C, and then placed in the cooling tank Hold for 60 minutes. Then, it is cooled at a usual cooling rate (about 10° C. / minute) to obtain a predetermined chemically strengthened glass. The stress curve of this glass is shown in FIG. 1 . C in the figure represents compressive stress, and T represents tensile stress. In this way, it is a chemically strengthened glass characterized by two types of curves, the compressive stress curve A on the glass surface side and the compressive stress curve B on the glass inner layer side, in the compressive stress layer. In addition, this stress curve is a stress curve showing the result of cutting out chemically strengthened glass, grinding it, and observing it using a Babinet compensator and an optical microscope. The...

Embodiment 2

[0068] Soda-lime float glass with a thickness of 0.55mm is immersed in potassium nitrate molten salt at 470°C for 4 hours for the first ion exchange treatment, then immersed at 510°C for 20 minutes for the second ion exchange treatment, and then proceed as usual Cool at a certain cooling rate (about 10°C / min) to produce a set chemically strengthened glass. The stress curve of this glass is shown in FIG. 2 . The ratio of the surface stress value obtained from the stress curve A to the hypothetical surface stress value obtained from the line extending from the compressive stress curve B to the glass surface was 0.89. In addition, the thickness of the compressive stress layer formed by the stress curve A is 5 μm.

[0069] Using a commercially available superhard wheel cutter, the chemically strengthened glass was subjected to scribing (load weight: 2 kg) and a cutting test according to a general cutting operation, and it was possible to cut without any problem.

Embodiment 3

[0078] Soda-lime float glass having a thickness of 0.7 mm was immersed in molten potassium nitrate salt at 460° C. for 10 hours to perform ion exchange treatment. Immediately after the treatment, the chemically strengthened glass was moved to a cooling tank set at 510° C., and kept in the cooling tank for 60 minutes. Then, it is cooled according to the usual cooling rate (about 10° C. / minute) to produce a set chemically strengthened glass product. In addition, the surface hardness of the chemically strengthened glass product is 570kgf / cm 2 .

[0079] Using a commercially available superhard wheel cutter, the chemically strengthened glass was subjected to scribing (load weight: 2 kg) and a cutting test according to a general cutting operation, and it was possible to cut without any problem.

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Abstract

The invention relates to a chemically reinforced glass having a compressive stress layer formed in the surface layer thereof by ion exchange, characterized in that it has two types of compressive stress curves in the compressive stress layer: an A curve present nearer to the surface of the glass, and a B curve present in the side of an inner layer of the glass; a first method and a second method for producing the chemically reinforced glass: a fist method, wherein, after the immersion treatment for ion exchange, a second immersion treatment is carried out at a temperature higher than that for the previous immersion treatment by 20 to 50 DEG C for 10 to 60 minutes, and a second method, wherein, after a first immersion treatment for ion exchange, a second immersion treatment is carried out at a temperature higher than that for the first immersion treatment by 20 to 50 DEG C for 10 to 60 minutes.

Description

technical field [0001] The present invention relates to chemically strengthened glass, and in particular to chemically strengthened glass used in the fields of electronic materials such as touch panels, automobiles and buildings, and a method for producing the same. Background technique [0002] From the viewpoint of saving resources and energy, and changes in social needs, tempered glass is being thinned or strengthened. Since it is difficult to produce glass with a plate thickness of less than 3mm, especially less than 2mm, by the commonly used air-cooling strengthening method, the chemical strengthening method is often used for glass less than 2mm. In addition, chemically strengthened glass has the advantage of being able to produce higher strength than glass generally tempered by air cooling. [0003] As the reason why chemically strengthened glass is often accepted by the market, in addition to the strengthening and high strength of the above-mentioned thin plate glass...

Claims

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Application Information

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IPC IPC(8): C03C21/00
Inventor 西瑞树荒谷真一
Owner CENT GLASS CO LTD
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