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Float glass for chemical strengthening

A float glass and chemical technology, which is applied in the field of chemically strengthened float glass, can solve problems such as strength reduction, inability to use display devices, and breakage of protective glass, and achieve the effect of suppressing warpage

Inactive Publication Date: 2014-03-12
AGC INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the thickness of the cover glass is reduced, the strength is reduced, and the cover glass itself may be broken due to being dropped during use or carrying, so that there is a problem that the original function of protecting the display device cannot be exerted.

Method used

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  • Float glass for chemical strengthening
  • Float glass for chemical strengthening
  • Float glass for chemical strengthening

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0050] Hereinafter, examples of the present invention will be described.

[0051] The 13 kinds of float glass for chemical strengthening of Examples 1 to 6 and Comparative Examples 1 to 7 were manufactured by using the following three glass materials A to C with a thickness of 0.8 to 1.1 mm by the float method. Potassium nitrate at 425 to 465 ° C (KNO 3 ) in molten salt for 2 to 4 hours to perform chemical strengthening.

[0052] Glass material A contains 73% SiO in terms of composition expressed in mol % 2 , 7.0% Al 2 o 3 , 14% Na 2 O, 6% MgO glass.

[0053] Glass material B contains 64.3% of SiO in terms of composition expressed in mol % 2 , 6.0% Al 2 o 3 , 12% Na 2 O, 4% K 2 O, 11% MgO, 0.1% CaO, 0.1% SrO and 2.5% ZrO 2 glass.

[0054] Glass material C contains 71.5% of SiO in terms of composition expressed in mol % 2 , 1.8% Al 2 o 3 , 12% Na 2 O, 0.9% K 2 O, 4.2% MgO, 8.7% CaO glass.

[0055] Then, the surface stress of the float glass for chemical streng...

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Abstract

This float glass for chemical strengthening is formed by the float method, and comprises a bottom surface that comes into contact with molten metal during casting, and a top surface that is opposite to the bottom surface. The surface compressive stress after chemical strengthening is at least 600 MPa, and the depth of a compressive stress layer is at least 15 [mu]m from the surface. The difference obtained by subtracting the surface compressive stress value ([sigma]CB) of the bottom surface from the surface compressive stress value ([sigma]CT) of the top surface before chemical strengthening is -0.6 MPa to 0.25 MPa.

Description

technical field [0001] The present invention relates to a chemically strengthened float glass having a surface compressive stress of 600 MPa or more after chemical strengthening and a compressive stress layer having a depth of 15 μm or more from the surface. Background technique [0002] In recent years, in flat-panel display devices such as mobile phones and PDAs, a thin plate-shaped cover glass is arranged on the front of the display in a wider area than the image display portion in order to protect the display and improve appearance. Since such flat panel display devices are required to be lightweight and thin, cover glasses used for display protection are also required to be thinner. However, when the thickness of the cover glass is reduced, the strength is reduced, and the cover glass itself may be broken by dropping it during use or carrying, so that the original function of protecting the display device cannot be exerted. [0003] Therefore, in conventional cover gla...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C21/00
CPCC03C3/085C03C21/002C03C3/087C03B18/02C03B18/00C03C21/00
Inventor 山中一彦小野田仁山本文藤原祐辅泷口哲史
Owner AGC INC