Hermetic glass-to-metal seal useful in headers for airbags
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United States of America Patent
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Aug 14, 2001
Issued Date -
N/A
app pub date -
Oct 14, 1997
filing date -
Aug 4, 1994
priority date (Note) -
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Abstract
A hermetic glass-to-metal seal between a conductive pin and an outer body, wherein a corrosion-resistant noble metal (e.g., gold) coating is applied to the conductive pin before the hermetic seal is formed. The noble metal-coated conductive pin is located in glass having a softening point less than about 650.degree. C. and disposed in a cavity of the outer body. This is accomplished by inserting the coated conductive pin into a bore in a glass preform, heating the assembly to a temperature in excess of the softening point of the glass but less than about 700.degree. C., and cooling the assembly. The coefficients of thermal expansion of the components of the assembly are preferably selected such that the resulting assembly is a hermetic compression seal.
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