​KOVAR machining parts are processed into hard glass iron-based sealing alloy with 29% nickel and 17% cobalt. This alloy has a linear expansion coefficient similar to that of hard glass in the range of 20 to 450 ℃, and can effectively seal with the corresponding hard glass. It also has a high Curie point and good low-temperature microstructure stability.

The alloy has a dense oxide film, is easy to weld and weld, has good plasticity, and can be machined.
​​Widely used in the production of electric vacuum components, emission tubes, picture tubes, switch tubes, transistors, sealed plugs and relay shells. Kovar alloy is more wear-resistant due to its cobalt content.

​​It has a certain linear expansion coefficient in the temperature range of 20℃-450℃, which can be matched and sealed firmly with hard glass.

Kovaryi and molybdenum group glass are matched and sealed, and the surface of the cnc machining parts generally requires gold plating.

​​Iron-nickel-cobalt alloy 4J29 (Kovar, Kovar, Kovar, ASTM F-15) 1.3912/UNS K94610
Uses: Used to make iron-nickel-cobalt alloy strips, bars, plates, and tubes that are matched and sealed with hard glass.

The expansion coefficient of the alloy in a wide temperature range (-80~450℃) is similar to that of hard glass. In the electric vacuum industry, it is used to seal hard glass to manufacture high-airtight cnc machining components, and it can also be used with ceramics. Sealing.

​​Iron-nickel-cobalt glass sealing alloy has a thermal expansion coefficient similar to that of silicon boron hard glass at 20-450 ℃, a high Curie point, and good low-temperature structural stability. It is an iron-nickel-cobalt glass sealing alloy.