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US 4,071,658 AGranted
Glass for metal seal
AssigneeGTE Sylvania Incorporated
InventorsPaul Millard Phillips, John Gleason Donaldson
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Abstract
A composite metallic article for effecting a seal with glass, said article comprising a nickel-iron alloy core portion, a low carbon steel alloy sheath portion bonded to the core, and a uniformly thick shell portion of a glass-wetting material bonded about the sheath. A method for making the article is also disclosed.
Claims7
A glass to metal seal of a metallic composite, said composite comprising:
- a central core portion of a wrought nickel-iron alloy wherein said nickel comprises about 42 percent by weight of said core with the balance iron;
- a substantially uniformly thick sheath portion of a low carbon steel alloy bonded about said core portion;
- and
- a substantially uniformly thick shell portion of a glass wetting metal bonded about said sheath portion, said composite having an average coefficient of thermal expansion within the range of from about 7.5 to about 10.0 cm/cm/.degree. C.times.10.sup.-6 over a temperature range of from about 25.degree. C to about 400.degree. C.
1 more element
Dependencies are inferred from the claim text.