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Kovar as also known as Nilo k, UNS K94610, ASTM F15, Iron Nickel Cobalt, Sealing Alloy, Alloy 12B, Alloy F15,29HK, KV-1, Dilver P0, Vacon 12, FeNi29Co17(Chinese 4J29) etc
A Nickel-Iron-Cobalt, controlled expansion alloy containing 29% Nickel. Its coefficient of expansion (which decreases with rising temperature to the inflection point) , matches the expansion rate of borosilicate glasses and aluminia ceramics. Applications include glass to metal seals in applications requiring high reliability or resistance to thermal shock, ie. high-power transmitting valves, transistor leads and heaters and photography flash bulbs.
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