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STRENGTHENED GLASS WITH DEEP DEPTH OF COMPRESSION

  • US 20150239776A1
  • Filed: 10/31/2014
  • Published: 08/27/2015
  • Est. Priority Date: 02/24/2014
  • Status: Active Grant
First Claim
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1. A glass article, the glass article having a thickness t and a compressive layer having a compressive stress CS of in a range from about 500 MPa up to about 1200 MPa at a surface of the glass article, wherein:

  • a. the compressive layer extends from the surface to a depth of compression DOC, wherein DOC≧

    0.1·

    t when t<

    0.5 mm and DOC≧

    50 μ

    m when t≧

    0.5 mm, and wherein the compressive layer has a compressive stress profile; and

    b. the compressive stress profile comprises;

    i. a first portion b extending from the surface to a depth db and having a slope mb, wherein 3 μ

    m≦

    db

    15 μ

    m and −

    40 MPa/μ

    m≧

    ma



    200 MPa/μ

    m; and

    ii. a second portion c extending from db to the depth of compression DOC and having a slope mc, wherein −

    2 MPa/μ

    m≧

    mc



    8 MPa/μ

    m.

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