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Glass ceramic seals to inconel

  • US 4,414,282 A
  • Filed: 04/19/1982
  • Issued: 11/08/1983
  • Est. Priority Date: 04/19/1982
  • Status: Expired due to Term
First Claim
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1. A glass ceramic composition prepared by subjecting a glass composition comprising, by weight, 65-80% SiO2, 8-16% Li2 O, 2-8% Al2 O3, 1-8% K2 O, 1-5% P2 O5 and 1.5-7% B2 O3, to the following processing steps:

  • a. heating the glass composition to a temperature sufficient to crystallize lithium metasilicate therein;

    b. holding the glass composition at a temperature and for a time period sufficient to dissolve the lithium metasilicate therein thereby creating cristobalite nucleii;

    c. cooling the glass composition and maintaining the composition at a temperature and for a time period sufficient to recrystallize lithium metasilicate therein; and

    d. thermally treating the glass composition at a temperature and for a time period sufficient to cause growth of cristobalite and further crystallization of lithium metasilicate producing a glass ceramic composition having a specific thermal expansion coefficient.

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