Wanfuxin 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 20~450℃, and can be effective with the corresponding hard glass. Sealing and matching, 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.
It is widely used in the production of electric vacuum components, emission tubes, picture tubes, switch tubes, transistors, and 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. Kovar is sealed with molybdenum group glass. Generally, the surface of the workpiece is required to be plated with gold.
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, pipes 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 for sealing with hard glass to manufacture high-airtight components, and it can also be used with ceramics. Sealing.
The 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.