Dual stage ion exchange for chemical strengthening of glass

A technology of ion exchange and strengthened glass, which is applied in the field of chemical strengthening of glass and chemically strengthened glass, and can solve the problem of loss of compressive stress on the glass surface

Active Publication Date: 2011-07-27
CORNING INC
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  • Abstract
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  • Claims
  • Application Information

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This method loses compressiv

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  • Dual stage ion exchange for chemical strengthening of glass
  • Dual stage ion exchange for chemical strengthening of glass
  • Dual stage ion exchange for chemical strengthening of glass

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[0019] In the following description, like reference numerals designate like or corresponding parts in the several views shown in the drawings. It should also be understood that terms such as "top", "bottom", "outwardly", "inwardly", etc. are terms of general usage and should not be construed as terms of limitation unless otherwise indicated. Furthermore, it will be understood that when a group is described as comprising at least one of a group of elements and combinations thereof, said group may contain any number of these listed elements, singly or in combination with one another, or consist essentially of They consist of, or consist of, them. Similarly, it will be understood that when a group is described as consisting of at least one of a set of elements or combinations thereof, said group can consist of any number of these listed elements either individually or in combination with each other. Unless otherwise stated, the recited numerical ranges include both the upper and...

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Abstract

A method of chemically strengthening a glass. The method includes ion exchange of the glass in a first bath, followed by immersion in the second bath. The first bath is diluted with an effluent ion. The second bath has a smaller concentration of the effluent ion than the first bath. The method provides a compressive stress at the surface of the glass that is sufficient to arrest flaws introduced by contact forces at the surface of the glass while having sufficiently deep compressive depth-of-layer for high reliability.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to US Provisional Application No. 61 / 084,398, filed July 29, 2008. Background technique [0003] This invention relates to the chemical strengthening of glass. More specifically, the present invention relates to the use of ion exchange processes in strengthening glass. Still more particularly, the present invention relates to methods involving multiple ion exchange processes. [0004] Chemically strengthened glass has recently been identified for use in handheld devices such as mobile phones, media players, and other devices, as well as other applications requiring transparency, high strength, and abrasion resistance. [0005] Ion exchange is a chemical strengthening process that begins with glass containing smaller ions (efflux ions) that are capable of being exchanged for larger ions (exchange ions) in molten salt baths at elevated temperatures, i.e. The larger ions replace the small...

Claims

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Application Information

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IPC IPC(8): C03C3/04
CPCC03C21/005C03C3/093C03C21/002Y10T428/24479C03C21/00C03C3/04
Inventor C·M·李L·G·曼J·M·奎恩塔尔Y·严
Owner CORNING INC
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