Method for preparing silver-magnesium-nickel alloy billets

Abstract

The invention discloses a method for preparing silver-magnesium-nickel alloy billets, which comprises the following steps of: preparing silver-magnesium intermediate alloy from Ag and Mg alloy elements by adopting a vacuum fusion casting technique; and proportioning Ag and Ni alloy elements and the silver-magnesium intermediate alloy according to a component proportion of a silver-magnesium-nickel alloy mark, putting the silver-magnesium intermediate alloy and Ni into a multistage charging system by using a vacuum intermediate-frequency induction furnace capable of performing multistage charging in vacuum respectively, and preparing the silver-magnesium-nickel alloy billets by precision processes of degassing, refining, heat insulation and the like. The gas content of the Ag and the oxidation of the magnesium are effectively controlled, the billets prepared by casting molding are directly prepared into plates, sheets or strips by cold-rolling processing, internal oxidation (800 DEG C / 2h) is performed in air by using a resistance furnace, and 'bubbles' are not produced on the surface of the material. The method for preparing the silver-magnesium-nickel alloy billets solves the problems that the burning loss of a little amount of additive component Mg is not easy to control and the plates and the strips prepared from a casting blank by cold rolling produce 'bubbles' on the internal oxidation surface in the atmosphere, and provides stable process guarantee for subsequent use of the materials.

Description

technical field [0001] The invention relates to an internally oxidized elastic electric contact material for aerospace, in particular to a method for preparing a silver-magnesium-nickel alloy ingot by vacuum precision melting and casting. Background technique [0002] Silver-magnesium-nickel alloy is an ideal material for miniature relay contacts and reeds used in aerospace precision instruments. It is characterized by good elasticity, electrical conductivity, thermal conductivity and corrosion resistance after internal oxidation, stable hardness, and creep speed is only one tenth of that of pure silver. This material is the main contact material for the integration of reed contacts of small and medium-sized military and civilian sealed relays. It is suitable for various micro and small switches, relay elastic contacts, integrated reed contacts, plug-in component reeds, large Shunt contacts of switches, heat-conducting spring splints of electronic tubes, instrument contacts...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a preparation method of silver-magnesium-nickel alloy ingot - high vacuum degassing three-stage feeding vacuum precision casting method. This method can solve the problem of controlling the burning loss of a small amount of added component Mg, which is difficult to control and the casting billet after cooling Problems with 'bubbling' of the oxidized surface in rolled sheets

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