Glass ceramic-to-metal seals

Patent · Sun Apr 18 23:00:00 EST 1982

OSTI ID:6463797

A glass ceramic composition prepared by subjecting a glass composition comprising, by weight, 65 to 80% SiO/sub 2/, 8 to 16% Li/sub 2/O, 2 to 8% Al/sub 2/O/sub 3/, 1 to 8% K/sub 2/O, 1 to 5% P/sub 2/O/sub 5/ and 1.5 to 7% B/sub 2/O/sub 3/, to the following processing steps of heating the glass composition to a temperature sufficient to crystallize lithium metasilicate therein, holding the glass composition at a temperature and for a time period sufficient to dissolve the lithium metasilicate therein thereby creating cristobalite nucleii, cooling the glass composition and maintaining the composition at a temperature and for a time period sufficient to recrystallize lithium metasilicate therein, and thermally treating the glass composition at a temperature and for a time period sufficient to caus growth of cristobalite and further crystallization of lithium metasilicate producing a glass ceramic composition having a specific thermal expansion coefficient and products containing said composition.

• DOE Contract Number: AC04-76DP00789
• Assignee: SNL; EDB-83-050746; ERA-08-018287
• Patent Number(s): None
• Application Number: ON: DE83006895
• OSTI ID: 6463797
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360101 -- Metals & Alloys-- Preparation & Fabrication
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
ALKALI METAL COMPOUNDS
ALLOYS
CERAMICS
CHALCOGENIDES
CRISTOBALITE
CRYSTALLIZATION
EXPANSION
GLASS
LITHIUM COMPOUNDS
LITHIUM SILICATES
MATERIALS
MINERALS
NICKEL ALLOYS
NICKEL BASE ALLOYS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
SEALING MATERIALS
SEALS
SILICATES
SILICON COMPOUNDS
SILICON OXIDES
THERMAL EXPANSION