A kind of silver-nickel electrical contact material and preparation method thereof

Abstract

The invention relates to the field of electrical contact materials, in particular to a silver-nickel electrical contact material and a preparation method thereof, which is composed of the following components and their mass percentages are: 8%≤nickel≤30%, 0.5%≤molybdenum carbide≤12 %, the balance being silver. The production process of this silver-nickel electric contact material adopts powder mixing-extrusion process. The present invention mainly considers improving the anti-welding performance of silver-nickel materials, and adds molybdenum carbide as a reinforcing phase. Molybdenum carbide has the advantages of high melting point, good thermal stability, and density similar to silver and nickel, which can be guaranteed by ordinary powder mixing process. Uniformity of ingredients, suitable for mass production. Compared with common silver-nickel materials, the material of the invention has high welding resistance and low arc energy, and is mainly used in AC 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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