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Kovar alloy, ASTM F15, Nilo-K, UNS K94610, (FeNi29Co17)
Chinese 4J29, YB/T5231-2005, (FeNi29Co17)
A Nickel-Iron-Cobalt, controlled expansion alloy containing 29% Nickel. It's 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.