Kovar Alloy

Kovar AlloyPrecision Alloy 4J29/4J44Glass sealed and controllled expansion alloys*kovar alloy,ASTM F15, Nilo-K,UNS K94610 (FeNi29Co17),Chinese 4J29*Specifications:ASTM F15; DIN 17745; S.E.W. 385; Werkstoff Nr. 1.3981; AFNOR NF A54-301Note: 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.ApplicationsKovar alloy has been used for making hermetic seals with the harder Pyrex glasses and ceramic materials. This alloy has found wide application in power tubes, microwave tubes, transistors and diodes. In intergrated circuits, it has been used for the flat pack and the dual-in-line package.Similar Grades:RussiaU.S.A.U.K.JapanFranceGermany29HKKovarNilo KKV-1Dilver P0Vacon 1229HK-BNRodar Techallony Glasseal 29-17TeleasealKV-2 KV-3Dilver P1Silvar 48Grade
Kovar Alloy