Chemically strengthened glass and method for producing same

A technology for strengthening glass and manufacturing methods, applied in the direction of coating, etc., can solve problems such as adverse effects of electronic equipment, and achieve the effect of suppressing the scattering of fragments and suppressing fracture

Active Publication Date: 2021-08-24
ASAHI GLASS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the protective film is peeled off from the surface of the protective glass, it may adversely affect electronic equipment due to the influence of static electricity.

Method used

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  • Chemically strengthened glass and method for producing same
  • Chemically strengthened glass and method for producing same
  • Chemically strengthened glass and method for producing same

Examples

Experimental program
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Effect test

Embodiment

[0230] Hereafter, although an Example demonstrates this invention, this invention is not limited to these Examples.

[0231] The glass raw materials were prepared to have the compositions shown in Table 1A to Table 1C in terms of molar percentages based on oxides, and weighed so as to be 400 g in terms of glass. Next, the mixed raw materials were put into a platinum crucible, put into an electric furnace at 1500° C. to 1700° C., melted for about 3 hours, degassed and homogenized.

[0232] These glass compositions are shown by mass % in Table 2A - Table 2C. The results of measuring the surface resistivities of glasses 1 to 20 are shown in Tables 2A to 2C. It should be noted that, in the table, the surface resistivity is expressed by logarithm, for example, the logarithm of the surface resistivity of glass 10 is 13.3 means that the surface resistivity is 10 13.3 Ω.

[0233] Table 1A

[0234]

[0235] Table 1B

[0236]

[0237] Table 1C

[0238]

[0239] Table 2A ...

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Abstract

A purpose of the present invention is to provide chemically strengthened glass that adequately suppresses both flexural mode breakage and impact mode breakage while also suppressing scattering of fragments upon breakage. The present invention relates to plate-shaped chemically strengthened glass having a compressive stress layer on the glass surface, wherein the compressive stress value (CS0) of the glass surface is 800 MPa or higher, the plate thickness (t) is 100 [mu]m or higher, the compressive stress layer depth (DOL) is (t * 0.1) [mu]m or higher, and CSB > CSA > 0 when the depth at which the compressive stress value reaches a maximum in the range in which the depth from the glass surface is 10 [mu]m or more and is smaller than DOL is taken as DB, the compressive stress value at depth DB is taken as CSB, the depth at which the compressive stress value reaches a minimum in the range in which the depth from the glass surface is DB or lower is taken as DA, and the compressive stress value at depth DA is taken as CSA.

Description

technical field [0001] The present invention relates to chemically strengthened glass and its manufacturing method. Background technique [0002] Chemically strengthened glass is used for cover glass of portable terminals and the like. Chemically strengthened glass is formed on the surface of the glass by exchanging the alkali metal ions contained in the glass with the alkali metal ions with a large ionic radius contained in the molten salt by contacting the glass with a molten salt such as sodium nitrate. Compressive stress layer of glass. The strength of chemically strengthened glass depends largely on the stress distribution represented by the compressive stress value as a variable of the depth from the glass surface. [0003] A cover glass of a portable terminal or the like may be cracked due to deformation such as when the glass is dropped from a high place. In order to prevent such fracture (fracture caused by bending mode), it is effective to increase the compressi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C21/00C03C3/083C03C3/085C03C3/087C03C3/091C03C3/093C03C3/097
CPCC03C3/087C03C3/083C03C3/095C03C23/0075C03C2218/31C03C4/02C03C21/002C03C3/085C03C3/091C03C3/093C03C3/097
Inventor 金原一树前田枝里子马田拓实今北健二
Owner ASAHI GLASS CO LTD
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