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Material Selection
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Terminals and Headers
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Terminals and Headers
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Terminals and Headers
1. Body materials
Cold rolled steel – lowest cost per unit weight of material
Kovar – when metal webbing is insufficient to support compression seals
300 series Stainless steel – non-magnetic; corrosion resistant properties; welding compatibility to Stainless assemblies
Tensile strength; corrosion resistant; non-magnetic; excellent option for high pressure operating environments
Hymu 80 – tensile strength; corrosion resistance; non-magnetic; welding compatibility to Nickel based assemblies
Titanium (Ti6Al4V & CP) – light-weight; non-magnetic; tensile strength; chemical resistant in specific applications; bio-compatible; welding compatibility to Ti
17-4 PH - tensile strength; not directly sealed with glass due to phase transformation temperature but suitable for attachment by welding of Inconel glass-to-metal-seals(GTMS)
2. Contact materials
Alloy 52 for
compression seals
; flexibility on termination features – capable of having wire bond features formed into the contact
Copper cored Alloy 52 – better electrical conductivity
Kovar – for matched seals; flexibility of termination features
446 Stainless steel – weldable and corrosion resistant
Molybdenum – weldable; chemical resistant
Tantalum – weldable; chemical resistant
Inconel non-magnetic
Copper electrical conductivity; not directly sealed with glass but mechanically attached to intermediate sleeve
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