A preparation method of copper-clad dispersed copper conductive rod with high strength, high conductivity and high softening temperature

Abstract

The invention relates to a method for preparing a high-strength, high-conductivity and high-softening-temperature copper-clad dispersed copper conductive rod, in particular to the technical field of conductive rod materials for arc extinguishing chambers for vacuum switches. The specific method steps include: 1) preparation of dispersed copper alloy powder; 2) preparation of dispersed copper rod in the core by cold isostatic pressing, the pressing pressure is 150-300 MPa, and the holding time is 3 minutes to 10 minutes; 3) vacuum sintering the dispersed copper in the core Rod, the highest sintering temperature is 800-1080°C, the holding time is 30-240min, and the vacuum degree is greater than 5pa; 4) The preparation of the outer copper sleeve; Sealing; 6) extrusion, extrusion temperature 600 ~ 1050 ° C; 7) cold drawing. In a word, the present invention has the advantages of high strength, high electrical conductivity, high softening temperature, and good brazing performance, and fully meets the use requirements of the conductive rod of the arc extinguishing chamber.

Description

technical field [0001] The invention belongs to the technical field of conductive rod materials for arc extinguishing chambers for vacuum switches, and in particular relates to a method for preparing a copper-clad dispersed copper conductive rod with high strength, high conductivity and high softening temperature. Background technique [0002] With the continuous miniaturization of the vacuum interrupter, the size of the conductive rod used in the interrupter is also continuously reduced. Therefore, more stringent requirements are put forward for the strength, conductivity, and softening temperature of the conductive rod material. The traditional single-component oxygen-free copper conductive rod can no longer meet the requirements of use. Currently there are two main solutions: [0003] (1) Improve the strength by alloying, such as adding chromium, zirconium, etc., although the addition of these elements can improve its strength, but if the addition exceeds 3%, it will ser...

AI Technical Summary

Problems solved by technology

Therefore, this problem cannot be solved well only by traditional alloying and dispersion strengthening.

[0005] The conductive rods used in traditional vacuum interrupters mainly use oxygen-free copper rods with a single component. The hardness index in the hard state is about 95HB, and after the vacuum interrupter is sealed, its hardness drops to about 40HB. During the closing process of a vacuum switch such as a circuit breaker, under the action of the closing force, the oxygen-free copper rod undergoes a thick deformation phenomenon under the action of the compressive force, which makes the indicators such as the opening distance of the vacuum switch contact change, which is serious. Affected the mechanical life of the vacuum switch

[0006] Dispersed copper has the characteristics of high strength, high conductivity, and high softening temperature. When it is used as a conductive rod material, its hardness index basically does not change after the arc extinguishing chamber is sealed, which can solve the problem of the hardness of oxygen-free copper materials. The problem of serious reduction, but dispersed copper itself has the disadvantage of poor brazing, which limits its use as a conductive rod material

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