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CRYSTALLIZED GLASS SUBSTRATE

  • US 20200131079A1
  • Filed: 04/10/2018
  • Published: 04/30/2020
  • Est. Priority Date: 06/26/2017
  • Status: Active Grant
First Claim
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1. A crystallized glass substrate comprising a crystallized glass serving as a base material and a compressive stress layer forming a surface thereof, the crystallized glass containing, in % by weight on an oxide basis:

  • 40.0% to 70.0% of a SiO2 component;

    11.0% to 25.0% of an Al2O3 component;

    5.0% to 19.0% of a Na2O component;

    0% to 9.0% of a K2O component;

    1.0% to 18.0% of one or more selected from a MgO component and a ZnO component;

    0% to 3.0% of a CaO component; and

    0.5% to 12.0% of a TiO2 component,the SiO2 component, the Al2O3 component, the Na2O component, the one or more selected from the MgO component and the ZnO component, and the TiO2 component being present in a total amount of 90% or more,wherein the compressive stress layer has a depth of layer of 40 μ

    m or more,the compressive stress layer has a surface compressive stress of 750 MPa or more, andthe compressive stress layer has a central compressive stress of 65 MPa or less as determined by curve analysis.

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