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

An electric contact material, silver-nickel technology, applied in the direction of contacts, circuits, electric switches, etc., can solve the problems that the uniformity and consistency of materials cannot be guaranteed, the resistivity of silver-nickel materials increases, and the uniformity of distribution cannot be guaranteed. Achieve good anti-welding performance, reduce arc energy, and improve anti-welding ability

Active Publication Date: 2018-09-21
ZHEJIANG FUDA ALLOY MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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.

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Take 8.9kg of silver powder and 1kg of nickel powder, and sieve through 200 mesh;

[0022] Silver-nickel mixed powder and 0.1kg molybdenum carbide powder were mixed in a plow-shovel mixer for 4 hours;

[0023] The silver-nickel-molybdenum carbide mixed powder is pressed into a spindle on a cold isostatic press under a pressure of 200 MPa and a holding time of 20 seconds;

[0024] Under the protection of argon, the ingot was sintered at 850°C for 2 hours, and then extruded into a wire with a specification of Φ6mm;

[0025] The wire is processed by cold drawing to make rivet contacts.

Embodiment 2

[0027] Get 16kg silver powder and 2kg nickel powder, sieve 100 mesh;

[0028] Mix the silver-nickel mixed powder with 2kg of molybdenum carbide powder in a plow-shovel mixer for 2 hours;

[0029] The silver-nickel-molybdenum carbide mixed powder is pressed into a spindle on a cold isostatic press under a pressure of 150 MPa and a holding time of 30 seconds;

[0030] Under the protection of argon, the ingot was sintered at 850°C for 2 hours, and then extruded into strips with a specification of 50×5mm;

[0031] The strip is cold-rolled-punched and processed into sheet contacts.

Embodiment 3

[0033] Take 8kg silver powder and 0.8kg nickel powder, and sieve 100 mesh;

[0034] Silver-nickel mixed powder and 1.2kg of molybdenum carbide powder were mixed in a plow-shovel mixer for 10 hours;

[0035] The silver-nickel-molybdenum carbide mixed powder is pressed into a spindle on a cold isostatic press under a pressure of 150 MPa and a holding time of 30 seconds;

[0036] Under the protection of argon, the ingot was sintered at 850°C for 2 hours, and then extruded into strips with a specification of 50×5mm;

[0037] The strip is cold-rolled-punched and processed into sheet contacts.

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01H1/023
CPCC22C1/05C22C5/06C22C32/0052H01H1/023H01H11/048
Inventor 万岱缪仁梁周克武姚培建柏小平林万焕
Owner ZHEJIANG FUDA ALLOY MATERIALS TECH CO LTD
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