Surface clad layer treatment method of copper tungsten electrical contact material for arc extinguish chamber

Abstract

The invention discloses a surface clad layer treatment method of a copper tungsten electrical contact material for an arc extinguish chamber. The method includes the steps that the copper tungsten alloy contact material is prepared to serve as a substrate material; mechanical buffing, washing and drying are carried out; the substrate material is placed into a vacuum chamber to deposit a chromium layer, a nickel layer or a titanium layer on a base body through a chromium target, a nickel target or a titanium target under the argon atmosphere; a copper target and a tungsten target are used for codeposition of a copper-tungsten clad layer on the substrate deposited with the chromium target, the nickel target or the titanium target continuously, and a copper tungsten-tungsten clad layer with a certain film thickness is obtained; and annealing is carried out under protection of a mixed atmosphere of inert gas and hydrogen, furnace cooling is carried out, a sample is taken out, and a copper tungsten electrical contact material surface clad layer is obtained. By means of the two-phase nanoscale uniform distributed structure, the ablation uniformity can be greatly improved, the ablation pit depth is reduced, and the service life is prolonged; meanwhile, a provided nanocrystalline tungsten framework can improve the arc ablation resistant capacity. By means of the method, equipment is simple and convenient to operate, the effect is obvious, and the good industrial application prospect is achieved.

Description

technical field [0001] The invention relates to a method for treating the surface coating of copper-tungsten electrical contact materials used in arc extinguishing chambers. Magnetron sputtering is used to deposit an X primer layer and a copper-tungsten coating on the surface of the copper-tungsten electrical contact material substrate, and the coating layer is well combined with the substrate. The invention has nano-scale two-phase size, and can reduce the surface roughness of contacts, significantly improve the uniformity of arc ablation of electric contact materials used in arc extinguishing chambers, and improve the life of arc resistance, and belongs to the technical field of material surface treatment and modification. Background technique [0002] The arc extinguishing chamber is the core component of the medium and high voltage power switch. Its main function is that the excellent insulation of the arc extinguishing medium enables the medium and high voltage circuits ...

AI Technical Summary

Problems solved by technology

There are two problems in the copper-tungsten contact materials for arc extinguishing chambers prepared by the above powder metallurgy method: 1. The powder quality, particle size, powder mixing, granulation, and sintering in the powder metallurgy process all have an impact on the final phase structure distribution. It is very easy to have uneven phase structure after sintering, and a certain phase gathers too much and is directly exposed to the arc in the arc extinguishing chamber, resulting in the concentration and selective ablation of the arc in the early breaking process , large ablation pits are formed locally, which further deteriorates the stability and service life of the material; 2. After machining, powder metallurgy composite materials often cooperate with mechanical polishing to improve their surface flatness, but the surface roughness after mechanical polishing Ra is generally above 0.5um. This rough surface can easily cause abnormal arc discharge and local ablation in the arc extinguishing chamber, thereby deteriorating the performance, causing premature failure of the material, and further leading to the scrapping of the arc extinguishing chamber.

"A preparation method for surface nanostructure of W-Cu alloy contact material" (Patent No. CN101886237 A) proposes to use pulsed electron beams to perform impact strengthening treatment on the surface of CuW material, which can significantly refine the structure and enhance the surface microhardness and durability. Abrasiveness; but this method will deteriorate the surface roughness of the material and can only be used after subsequent machining, and the introduction of burrs in machining and unfavorable polishing will cause concentrated and selective ablation of the arc, resulting in extremely poor performance and shortened life.

Electron beam equipment is expensive and not conducive to industrial production

In recent years, magnetron sputtering has achieved good application results in industrial applications such as tool coatings and wear-resistant and anti-corrosion coatings for some structural parts. Preparation of copper tungsten coating on the surface of the contact material to improve the ablation resistance and service life of the electrical contact material used in the arc extinguishing chamber

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