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4J50


4J50 is a series of constant-expansion alloys that can match soft glass and ceramics with different expansion coefficients within a given temperature range by adjusting the nickel content. Its expansion coefficient and Curie point increase with the increase of nickel content. This group of alloys are widely used as sealing structural materials in the electric vacuum industry. 4J50 is a typical brand of glass-sealed alloy, which has been used for a long time in aviation factories and has stable performance. Used for making precision impedance diaphragm, wet spring and dry spring relay, precision length measurement, and sealing with corresponding soft glass. In application, the selected sealing material should match the expansion coefficient of the alloy. The grain size shall be controlled during heat treatment to ensure that the material has good deep drawing and drawing properties. When forging and rolling materials are used, the air tightness of materials shall be strictly inspected.

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