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A kind of preparation method of silver-coated graphene reinforced copper-based electrical contact material

An electrical contact material, graphene technology, applied in the direction of metal material coating process, contacts, circuits, etc., can solve the problems of reduced conductivity, density and other properties, high cost of magnetron sputtering, and difficulty in large-scale production, etc. Achieve the effect of improving bonding strength, good arc extinguishing performance and good mechanical properties

Active Publication Date: 2018-04-27
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Literature [Preparation and Performance Research of Graphene Reinforced Copper-based Composite Materials] studied the influence of graphene on copper-based composite materials. Since the surface treatment of graphene was not carried out, the interface between graphene and copper matrix was poor, except In addition to the increase in hardness, the conductivity, density and other properties are reduced
Patent application [CN105603247A] discloses a graphene-reinforced copper-rare-earth-based electrical contact material and its preparation method. The graphene-reinforced copper-based electrical contact is used. Since the surface treatment of graphene is not carried out, it is difficult to solve the problem of its contact with the copper substrate. The problem of poor interface integration
Patent application [CN105609159A] discloses a copper-coated graphene-reinforced copper-based electrical contact material and its preparation method. The graphene is copper-plated by magnetron sputtering, but the cost of magnetron sputtering is high and it is difficult to scale production, and there are problems of uneven coating and poor bonding

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Take graphene with a single layer and go through roughening, sensitization and activation treatments in sequence, and finally add it to the chemical plating solution for silver plating. The roughening treatment solution is composed of concentrated sulfuric acid and concentrated nitric acid with a volume ratio of 3:1, and the sensitization solution is composed of 50ml / L HCl and 30g / L SnCl 2 Composition, the activation solution consists of 0.5g / L AgNO 3 and 30ml / L ammonia water, the plating solution consists of 20g / L AgNO 3 , 30g / L glucose, 100g / L potassium sodium tartrate and 40ml / L ethanol. All stages were ultrasonically dispersed for 40 minutes, washed with water and filtered until neutral, and finally dried in a vacuum oven for use;

[0021] (2) Take 200 mesh copper-yttrium alloy powder (0.1wt% yttrium content), and first remove the surface oxide layer with dilute sulfuric acid. Adopt the method of electroless silver plating to carry out electroless silver plat...

Embodiment 2

[0026] Carry out according to this composition ratio and the same preparation process steps and parameters of Example 1, wherein the graphene content is brought up to 0.2wt.%, and the AgNO of the graphene silver plating solution 3 Concentration increased to 25g / L. Through the above process, a copper-based electrical contact composite material is made.

[0027] Basic properties of this material: Density 90.0%; Electrical conductivity 81.2%IACS; Hardness 53.4HB; Oxidation weight gain of 1.6mg / cm2 in 400°C atmospheric environment for 20h 2 .

Embodiment 3

[0029] According to the composition ratio and the same preparation process steps and parameters as in Example 2, copper-yttrium alloy powder with a yttrium content of 0.2wt.% was used. Through the above process, a copper-based electrical contact composite material is made.

[0030] Basic properties of this material: Density 88.6%; Electrical conductivity 76.3% IACS; Hardness 48.3HB; Oxidation weight gain of 2.0mg / cm2 under 400°C atmospheric conditions for 20h 2 .

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Abstract

The invention relates to a copper-based electrical contact material for medium and low-voltage electrical switches, in particular to a method for preparing a silver-plated graphene-reinforced copper-based electrical contact composite material. The copper-based composite material of the present invention is composed of the following composition ratios: 0.5~4wt.% bismuth, 0.05~0.5wt.% yttrium, 0.1~0.5wt.% graphene (silver plating), 1~5wt.% % silver, the rest is copper and other unavoidable impurities. The invention prepares copper-yttrium alloy powder, electrolessly silver-plates it, mixes it with silver-plated graphene ball mill, and finally presses and sinters to make the electric contact material. The present invention improves the oxidation resistance of the material by silver-plating the surface of the copper powder, and silver-plates the graphene to enhance its combination with the copper matrix, thereby improving the overall performance of the material, and finally obtaining good electrical conductivity and arc resistance. Copper-based electrical contact material with excellent corrosion and welding resistance.

Description

technical field [0001] The invention relates to a copper-based electrical contact composite material for medium and low-voltage electrical switches, in particular to a method for preparing a silver-plated graphene-reinforced copper-based electrical contact composite material. Background technique [0002] Electrical contact materials play a vital role in electrical switches, and they play an important role in the service life of electrical appliances, including the stability and reliability of the entire system. In order to ensure the reliability and service life of electrical contact materials, the electrical contact materials of high-quality electrical appliances are mostly made of metal silver-based electrical contact materials, and the silver content of these metal silver-based electrical contact materials is 85wt.%~95wt .%, so almost a quarter of the world's silver production is needed to make the required electrical contact elements. At the same time, because the annu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C9/00C22C1/05H01H1/025H01H1/027C23C18/44
CPCH01H1/025H01H1/027C22C1/05C22C9/00C23C18/44B22F2998/10B22F1/0003B22F1/17B22F3/10B22F3/02
Inventor 滕新营刘焕超耿浩然武祥为肖振代文燕
Owner UNIV OF JINAN
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