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

A technology of electric contact material, silver iron, applied in the direction of contacts, circuits, electric switches, etc., can solve the problem of large contact resistance, achieve low contact resistance, stable contact resistance, and short production cycle

Active Publication Date: 2020-03-31
ZHEJIANG FUDA ALLOY MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a silver-iron-nickel electrical contact material in order to overcome the shortcomings and deficiencies of the prior art, which solves the problem of large contact resistance of the silver-iron material in the electrical contact process, making the silver-iron system The material can replace the silver-nickel electrical contact material and be more widely used

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] a) get 9.480kg silver powder, 0.250kg nickel powder and 0.250kg iron powder, sieve 200 orders;

[0018] b) silver-iron-nickel mixed powder mixed with 0.010kg of graphite powder and 0.010kg of lanthanum powder in a powder mixer for 6h;

[0019] c) The mixed powder obtained in step b is pressed into a spindle on a cold isostatic press, under a pressure of 100 MPa, and a holding time of 10 seconds;

[0020] d) The ingot obtained in step c was sintered at 800°C for 3 hours under the protection of hydrogen, and then extruded into a wire with a specification of Φ6mm;

[0021] e) The wire material obtained in step d is processed by cold drawing to make rivet contacts.

Embodiment 2

[0023] a) get 10.050kg silver powder, 4.000kg iron powder and 0.500kg nickel powder, and sieve 100 mesh;

[0024] b) silver-iron-nickel mixed powder mixed with 0.150kg of graphite powder and 0.300kg of lanthanum powder in a powder mixer for 8h;

[0025] c) The mixed powder obtained in step b is pressed into a spindle on a cold isostatic press with a pressure of 200 MPa and a holding time of 60 seconds;

[0026] d) The ingot obtained in step c is sintered at 850° C. for 2 hours under the protection of argon, and then extruded into a strip with a specification of 40×4 mm;

[0027] e) The strip obtained in step d is processed into a sheet contact through cold rolling-punching.

Embodiment 3

[0029] a) get 9.516kg silver powder and 2.400kg iron-nickel alloy powder, sieve 120 orders, wherein iron-nickel alloy composition is FeNi30;

[0030] b) silver-iron-nickel mixed powder mixed with 0.060kg of graphite powder and 0.024kg of lanthanum-nickel powder in a powder mixer for 4h, wherein the lanthanum-nickel alloy powder composition is LaNi5;

[0031] c) The mixed powder obtained in step b is pressed into a spindle on a cold isostatic press, under a pressure of 180MPa, and the holding time is 40S;

[0032] d) The ingot obtained in step c is sintered at 830°C for 4 hours under the protection of argon, and then extruded into a wire with a specification of Φ6mm;

[0033] e) The wire material obtained in step d is processed by cold drawing to make rivet contacts.

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Abstract

The invention discloses a silver-iron-nickel electric contact material, the material composition and mass percentage of which are as follows: the mass percentage of each component is: 5%≤the total amount of iron and nickel≤30%, 0.01%≤graphite≤ 1%, 0.01%≤lanthanum≤2%, the balance is silver; the mass percentage of iron in the total amount of iron and nickel is 1%≤iron≤29%, and the balance is nickel. This silver-iron-nickel electrical contact material is produced using a co-powder-extrusion process. The invention reduces the continuity and thickness of the oxide film on the surface during the electrical contact process by adding nickel element and trace amounts of graphite and lanthanum, so as to reduce the contact resistance and temperature rise and improve the welding resistance of the material. The material prepared by the invention can be used to replace silver-iron materials and silver-nickel materials, and is applied to AC contactors and relays.

Description

technical field [0001] The invention belongs to the field of electrical contact materials, and specifically refers to a silver-iron-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. Silver ferroelectric contact materials also have good electrical conductivity and resistance to electrical wear, but have not been widely used because of the easy formation of continuous oxide film layers on the surface during the electrical contact process, resulting in incre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C5/06C22C1/05H01H1/023H01H1/027
CPCC22C1/05C22C5/06H01H1/023H01H1/027
Inventor 万岱缪仁梁姚培建周克武张东东张秀芳张海金妹宋林云林应涛
Owner ZHEJIANG FUDA ALLOY MATERIALS TECH CO LTD
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