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Zircon compatible glasses for down draw

  • US 8,802,581 B2
  • Filed: 08/16/2010
  • Issued: 08/12/2014
  • Est. Priority Date: 08/21/2009
  • Status: Active Grant
First Claim
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1. A glass comprising SiO2, Al2O3, and Na2O, wherein SiO2+B2O3

  • 66 mol %, Al2O3

    7 mol %, B2O3

    6.27 mol %, Na2O≧

    9 mol %, B2O3+Na2O+K2O+MgO+CaO≧

    18 mol %, and CaO≦

    2 mol %, wherein the glass has a temperature T35kp at which the glass has a viscosity of 35 kpoise and a zircon breakdown temperature Tbreakdown at which zircon breaks down to form ZrO2 and SiO2, wherein Tbreakdown is greater than T35kp wherein Tmargin=Tbreakdown

    T35kp, wherein Tmargin

    C.)=446.6−

    50.2[Al2O3]+22.6[B2O3]−

    4.4[Na2O]−

    3.9[K2O]−

    1.2[MgO+CaO] where concentrations [Al2O3], [B2O3], [Na2O], [K2O], [MgO], and [CaO] are expressed in mol %, and wherein Tmargin

    0.

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