Seals between ceramic articles or between ceramic articles and metal articles
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United States of America Patent
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Aug 7, 1990
Grant Date -
N/A
app pub date -
Aug 9, 1988
filing date -
Aug 18, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A seal between two ceramic articles, or between a ceramic article and a metal article, is formed by providing a sealing member comprising an aluminum body, and a film of zinc or tin being deposited threon, with the inevitable aluminum oxide surface film removed, and subsequently a coating of silver and/or gold, or a suitable alloy containing silver or gold, being provided. The sealing member is positioned between the articles, and the bonding operation comprises heating the assembly in an inert atmosphere, or in a high vacuum, to melt the composite sealing member, there being obviated the need to apply pressure during the bonding operation. Any oxide film on silver readily decomposes at a temperature of, at most, 250.degree. C. No oxide film is formed on gold. The zinc or tin film, and the coating, are readily absorbed into the molten aluminum produced during the bonding operation. Subsequently, the bonded assembly is out-gassed at a temperature up to 600.degree. C. A ceramic article may be of a glass ceramic, or of fused silica; and a metal article may be of a suitable nickel-iron alloy.
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