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Learn More About Kovar, ASMT F15 and Controlled Expansion AlloysFrom Wikipedia, the free encyclopediaKovar is a nickel-cobalt ferrous alloy designed to be compatible with the thermal expansion characteristics of borosilicate glass (~5×10-6 /K between 30 and 200°C, to ~10×10-6 /K at 800°C) in order to allow direct mechanical connections over a range of temperatures. It finds application in electroplated conductors entering glass envelopes of electronic parts such as vacuum tubes (valves), X-ray and Microwave tubes and some lightbulbs. The name Kovar is often used as a general term for FeNi alloys with these particular thermal expansion properties. Note the related particular Fe-Ni alloy Invar which exhibits minimum thermal expansion. Tips for machining Kovar Alloys
Typical Compositiongiven in weight % Properties
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