Mill additions for sealing glasses
AssigneeCorning Incorporated
InventorRobert Morena
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Abstract
A sealing glass material comprising a thermally crystallizable, PbO--ZnO--B.sub.2 O.sub.3 sealing glass flit and a mill addition selected from alumina, zircon, and manganese dioxide, the mill addition being in an amount sufficient to increase the mechanical strength in a fusion seal to at least 55.2 MPa(8000 psi), but the amount being not over about 5% by weight of the sealing material.
Claims9
A material for a fusion-type seal, the material consisting essentially of a thermally crystallizable, PbO--ZnO--B.sub.2 0.sub.3 sealing glass frit and a mill addition, the mill addition consisting essentially of at least one additive that enhances seal strength, that is selected from a group consisting of alumina, zircon, and manganese dioxide, and that is present in an amount sufficient to provide a mechanical strength of at least 55.2 MPas (8000 psi) in a fusion seal made with the material, the amount of additive being at least 2%, but not over about 5% by weight of the sealing material.
A composite article composed of at least two component parts joined by a fusion seal, the fusion seal being the fused and thermally crystallized product of a sealing glass material consisting essentially of a thermally crystallizable, PbO--ZnO--B.sub.2 0.sub.3 sealing glass frit and a mill addition selected from the group consisting of alumina, zircon, and manganese dioxide, the mill addition being present in an amount sufficient to provide a mechanical strength of at least 55.2 MPas (8000 psi) in the fusion seal, the amount of additive being at least 2%, but not over about 5% by weight of the sealing material.
Dependencies are inferred from the claim text.