Method of forming corrosion-resistant glassceramic-to-metal seal

Details Method of forming corrosion-resistant glassceramic-to-metal seal Method of forming corrosion-resistant glassceramic-to-metal seal

1978-11-15

1980-04-22

Bashore, S. Leon

Glass manufacturing

Processes

Operating under inert or reducing conditions

65 33, 65 40, 65 59B, 65 59R, 65DIG4, C03B 3200, C03B 2320, C03C 2702

Patent

active

041993403

ABSTRACT:
Corrosion-resistant, hermetic glassceramic-to-metal seals are made in a single rapid heating step by inserting a glass preform made of 25-35% by weight ZnO, 2.5-10% by weight Al.sub.2 O.sub.3 and 30-60% SiO.sub.2 together with optional nucleating and/or fluxing agents, between a metal pin and surrounding metal collar. Heating is rapid in a single step to first fluidize the glass, while avoiding excessive oxidation of the metal pin and the metal collar and to prevent excessive interaction of the glass composition at the glass/collar interface, then to ceram the seal. The resulting seals exhibit good corrosion resistance to potassium hydroxide solutions and are useful in Ni-Cd batteries.

REFERENCES:
patent: 2386820 (1945-10-01), Spencer
patent: 3166396 (1965-01-01), Millet et al.
patent: 3183361 (1965-05-01), Bronson et al.
patent: 3225132 (1965-12-01), Baas et al.
patent: 3236610 (1966-02-01), McMillan et al.
patent: 3240661 (1966-03-01), Babcock
patent: 3371413 (1968-03-01), Rundle
patent: 3490886 (1970-01-01), Stoll
patent: 3540957 (1970-11-01), Bawa et al.
patent: 4086075 (1978-04-01), Ekkelboom et al.
patent: 4142881 (1979-03-01), Louis

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