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Glass article and method for forming the same

  • US 10,710,927 B2
  • Filed: 08/20/2018
  • Issued: 07/14/2020
  • Est. Priority Date: 03/13/2014
  • Status: Active Grant
First Claim
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1. A glass article comprising:

  • a core comprising a core glass composition; and

    a clad adjacent to the core and comprising a clad glass composition comprising SiO2, Al2O3, B2O3, and at least one alkali metal oxide selected from the group consisting of Li2O, Na2O, K2O, Rb2O, Cs2O, and combinations thereof;

    wherein a concentration of SiO2 in the clad glass composition is about 45 mol % to about 60 mol %;

    wherein a coefficient of thermal expansion (CTE) of the clad glass composition is about 50×

    10

    7
    °

    C. to about 95×

    10

    7
    °

    C.;

    wherein a liquidus viscosity of the clad glass composition is at least about 50 kP; and

    wherein a degradation rate of the clad glass composition in a reagent is greater than a degradation rate of the core glass composition in the reagent.

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