Silver-nickel electric contact material and preparing method thereof

Abstract

The invention relates to the field of electric contact materials, in particular to a silver-nickel electric contact material and a preparing method thereof. The silver-nickel electric contact material comprises, by mass percent, larger than or equal to 8% and smaller than or equal to 30% of nickel, larger than or equal to 0.5% and smaller than or equal to 12% of molybdenum carbide, and the balance silver. A powder mixing-extrusion technology is adopted in a production technology for the silver-nickel electric contact material. Improvement of the welding resistance performance of the silver-nickel material is mainly taken into consideration, the molybdenum carbide is added to serve as a reinforcement phase, and the molybdenum carbide has the beneficial effects that the melting point is high, heat stability is good, and the density of the molybdenum carbide is close to that of silver and nickel; and component uniformity can be guaranteed through the ordinary powder mixing technology, and the silver-nickel electric contact material and the preparing method thereof are suitable for volume production. Compared with ordinary silver and nickel materials, the silver-nickel electric contact material has high welding resistance performance and low electric arc energy and is mainly applied to alternating current contactors and relays.

Description

technical field [0001] The invention relates to the field of electrical contact materials, in particular to a silver-nickel electrical contact material and a preparation method thereof. Background technique [0002] In the field of electrical contacts, silver-nickel electrical contact materials have good electrical and thermal conductivity, excellent resistance to arc burnout under low current conditions, and low and stable contact resistance. AgNi material has excellent processing performance, low manufacturing cost, easy mass production, and is an environmentally friendly electrical contact material, so it is widely used in AC contactors and relays with current levels of 25A and below. With the increase of the current level, the silver-nickel material will not be able to meet the requirements of use due to its poor anti-welding performance and anti-arc burning performance. [0003] How to enhance the welding resistance and arc burning resistance of silver-nickel materials...

AI Technical Summary

Problems solved by technology

In terms of material composition, the patent CN1193109C discloses a silver-nickel-tungsten-germanium dioxide-lithium carbonate electrical contact material, by adding tungsten to reduce the welding strength between the contact materials during the contact process and improve the welding resistance , adding alkali metal salt lithium carbonate powder is used to diffuse arc root spots, adding wetting agent germanium dioxide to improve the wettability of liquid silver to the contact surface, and due to the interaction between silver powder, nickel powder and these three additive powders There is a large difference in density, and the uniformity and consistency of the material cannot be guaranteed by the powder mixing process

Patent CN101831571B discloses a silver-nickel-tantalum carbide electrical contact material. The anti-welding performance of the material is improved by adding tantalum carbide, but the resistivity of tantalum carbide is high, and the resistivity of the silver-nickel material will increase after the addition. In addition, because the density of tantalum carbide is 14.3g / cm3, which is quite different from that of Ag and Ni, the uniformity of its distribution cannot be guaranteed by the ordinary powder mixing process.

Patent CN102808098B discloses a silver-nickel-graphite electrical contact material. The welding resistance of the silver-nickel material is improved by fibrously distributed colloidal graphite particles. The production process is relatively complicated and is not suitable for mass production.

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