Precision Alloy 4J29 Designed for Thermal Expansion Compatibility with Borosilicate Glass in Electronic Parts

Resistohm 70 NiCr 70/30 Nikrothal 70 Chromel 70/30 HAI-NiCr 70 Cronix 70 Inalloy 70 X30H70 High Temperature Resistance Alloy

Classification : the alloy of expansion characteristics

Application: Kovar (trademark of CRS Holdings, inc., Delaware[1]) is a nickel-cobalt ferrous alloy compositionally identical to Fernico 1, 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.

Chemical Composition in % 4j29 / Kovar

The Mechanical properties of 4j29 / Kovar

The name Kovar is often used as a general term for Fe-Ni alloys with these particular thermal expansion properties. Note the related particular Fe-Ni alloy Invar which exhibits minimum thermal expansion.

TANKII, referring to the presence of high-power production, offers customers buy alloy Kovar in the required quantities and ensures minimum time shipments of rolled metal products, made on the basis of Kovar.

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