Glass-to-metal feedthroughs & connectors
Microcertec offer a variety of leak-tight glass-to-metal seals : single lead or multiple-pin connectors designs which are manufactured by its sister company CTVM. The designs of these assemblies are based on sealing glass and Kovar, molybdenum or stainless steel 316 L metals.They are used in such applications as ignition devices, aerospace and submarine connectors, vacuumm and high-vacuum equipment.
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Hermetic glass-to-metal assemblies are particularly suited for use in such severe environments as, for instance :
- airborne electronics for the aerospace - civilian and military,
- defense devices,
- medical and analytical instruments,
- high-energy physics, high and very high vacuum,
- energy industry.
The product range is not restricted to the here below list since the company mainly manufactures customized glass to metal assemblies. For instance :
- high-voltage feedthroughs for the mass spectrometry, ion guns...
- high-voltage and/or high-pressure and/or high-temperature hermetic connectors for the energy industry..
- glass-to-metal gun enveloppes for electron tubes..
- hermetic feedthroughs for airborne sensors...
When designing a glass to metal seal, the choice of glass grade and metal is of prime importance. Both must have a matched or close thermal expansion coefficient.
Glass grades are typically electronic glass type - Schott 8250 -, dedicated sealing preform glass, but also borosilicate glass.
The metal that is directly joined to the glass must have a close coefficient of thermal expansion so that the risk of residual stress in the seal that would lead to rupture is minimized. Those that are mainly used are nickel-iron alloys - Kovar, FN48, FN52… - stainless steel, molybdenum.