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Strengthened glass with ultra deep depth of compression

  • US 10,150,698 B2
  • Filed: 10/29/2015
  • Issued: 12/11/2018
  • Est. Priority Date: 10/31/2014
  • Status: Active Grant
First Claim
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1. A glass article, the glass article comprising a thickness t and a compressive region having a compressive stress CSs in a range from about 400 MPa to about 1200 MPa at a surface of the glass article, wherein the compressive region extends from the surface to a depth of compression DOC, wherein 0.1·

  • t≤

    DOC≤

    0.25·

    t, and has a compressive stress profile, the compressive stress profile comprising;

    a. a first portion b extending from the surface to a depth db below the surface and having a slope mb, wherein −

    40 MPa/μ

    m≥

    mb



    200 MPa/μ

    m; and

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

    0.4 MPa/μ

    m≥

    mc



    3.0 MPa/μ

    m.

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