Product features

4J29 has a linear expansion coefficient similar to that of hard silicon-boron glass between 20-450°C, a high Curie point, nd good low-temperature structural stability. The alloy forms a dense oxide film that is well wetted by glass. Furthermore, it does not react with mercury, making it suitable for use in instwith mercury discharge. It is a primary sealing structural material for electronic vacuum devices. 4J32 alloy, also known as Super-Invar, is a low-expansi iron-nickel-cobalt alloy with a low expansion coefficient in the range of 20-100°C.

Application scope domain

4J29 is primarily used for glass sealing of components such as electron tubes, oscillator tubes, ignitrons, magnetrons, transistors, sealelugs, relays, and integrated circuits, including lead wires, bases, casings, and brackets. In application, the selected glass should have a thermal expansion coefficient matching that of thloy; the low-temperature structural stability should be strictly inspected based on the operating temperature; appropriate heat treatment should be performed during processing to ensure good deep drawing and elongation properties; anusing forged materials, the gas tightness should be strictly inspected. 4J32 is suitable for various instrument parts requiring dimensional stability, as well as passive layers of therbimetals and resonant cavities.