Product Features

4J29 has a high Curie point of linear expansion coefficient similar to that of borosilicate hard glass at 20-450 ° C, and has good low-temperature structural stability. The oxide film of the alloy is dense and can be well infiltrated by glass. And it does not interact with mercury, suitable for use in instruments containing mercury discharge. It is the main sealing structural material for electric vacuum devices. 4J32 alloy, also known as Super Invar alloy, is a low expansion iron nickel diamond alloy with a low coefficient of expansion in the range of 20-100 ° C.

Application scope and field

4J29 is mainly used for glass sealing of electric vacuum components such as emitter tubes, oscillating tubes, ignition tubes, magnetrons, transistors, sealed plugs, relays, integrated circuit leads, chassis, shells, brackets, etc. In application, the selected glass should match the expansion coefficient of the alloy, and its low-temperature structural stability should be strictly inspected according to the operating temperature. Proper heat treatment should be carried out during the processing to ensure that the material has good deep drawing and drawing properties. When using forged materials, their airtightness should be strictly inspected. 4J32 is suitable for various instruments, instrument components, thermal bimetallic passive layers, and resonant cavities that require dimensional stability.