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Silver tungsten carbide graphene electrical contact material and preparation method thereof

An electrical contact material, tungsten carbide graphite technology, which is applied in the field of silver tungsten carbide graphene electrical contact material and its preparation, can solve the problems of no significant characteristics of anti-fusion welding performance, large difference in the proportion of graphite, increase in product cost, etc. Make up for the effects of large and unstable contact resistance, high density, and improved reliability

Active Publication Date: 2018-09-14
SHANGHAI HIWAVE COMPOSITE MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The patent introduces zirconium carbide hard phase, but the material has no significant characteristics of anti-welding performance, and will increase the product cost. However, the graphite introduced in the invention patent has excellent anti-welding performance, but the specific gravity of graphite and other materials The difference is big, and the ordinary powder mixing method will cause material segregation and graphite agglomeration, which will bring many performance effects

Method used

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  • Silver tungsten carbide graphene electrical contact material and preparation method thereof
  • Silver tungsten carbide graphene electrical contact material and preparation method thereof

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preparation example Construction

[0051] Such as figure 1 As shown, this figure is a flow chart of the preparation method of the silver tungsten carbide graphene electrical contact material when the tungsten carbide content of the present invention is 12wt%-25wt%, and the preparation process of the silver tungsten carbide graphene electrical contact material can be carried out sequentially according to this process , and individual steps can also be selected according to actual application requirements.

[0052] Such as figure 2 As shown, this figure is a flow chart of the preparation process of the silver tungsten carbide graphene electrical contact material when the tungsten carbide content of the present invention is greater than 25wt% and less than or equal to 85wt%. The preparation process of the silver tungsten carbide graphene electrical contact material can be according to this The process is carried out sequentially, and individual steps can also be selected according to actual application requireme...

Embodiment 1

[0055] This embodiment provides the preparation of a silver / tungsten carbide / graphene / nickel electrical contact material, the operation steps are as follows:

[0056] Ⅰ) Material composition of silver / tungsten carbide / graphene / nickel electrical contact materials

[0057] The material components of silver / tungsten carbide / graphene / nickel electrical contact materials are mainly metallic silver, tungsten carbide, graphene, and metallic nickel, wherein the content of tungsten carbide is 12wt%, the content of graphene is 0.1wt%, and the content of nickel is 0.5wt% %, the balance being silver.

[0058] Ⅱ) Basic steps for preparing silver / tungsten carbide / graphene / nickel electrical contact materials (see attached figure 1 )

[0059] 1) Prepare 0.1mol / L silver nitrate solution, 0.1mol / L nickel nitrate solution, 0.1mol / L ascorbic acid solution (or one or more of glucose, citric acid or oxalic acid).

[0060] 2) According to the composition of the material, a quantitative ascorbic ac...

Embodiment 2

[0066] The main difference from Example 1 is: the content of tungsten carbide in the product in Example 2 is 25wt%, the content of graphene is 3wt%, the content of nickel is 1.5wt%, and the balance is silver.

[0067] The basic operation steps for preparing silver / tungsten carbide / graphene / nickel electrical contact material in this embodiment 1 are as follows:

[0068] Ⅰ) Material composition of silver / tungsten carbide / graphene / nickel electrical contact materials

[0069] The material components of silver / tungsten carbide / graphene / nickel electrical contact materials are mainly metallic silver, tungsten carbide, graphene, and metallic nickel, wherein the content of tungsten carbide is 25wt%, the content of graphene is 3wt%, and the content of nickel is 1.5wt%. , and the balance is silver.

[0070] Ⅱ) Basic steps for preparing silver / tungsten carbide / graphene / nickel electrical contact materials (see attached figure 1 )

[0071] 1) Prepare 0.2mol / L silver nitrate solution, 0.2...

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Abstract

The invention discloses a silver tungsten carbide graphene electrical contact material and a preparation method of the silver tungsten carbide graphene electrical contact material. Silver is adopted as a base material, tungsten carbide serves as a first reinforcement phase, graphene serves as a second reinforcement phase, and nickel serves as a third reinforcement phase. The invention further discloses the preparation method of the material. Silver / graphene oxide / nickel compound powder is prepared through a chemical method; tungsten carbide powder is subjected to ball milling compounding withthe silver / graphene oxide / nickel compound powder, a silver / tungsten carbide / graphene oxide / nickel compound powder body is obtained, then the compound powder body is subjected to reduction treatment, and a silver / tungsten carbide / graphene / nickel compound powder body is obtained; and the material is prepared through a powder metallurgy technology or prefabricated body pressing and forming or an airpressure infiltration technology. The nickel element is introduced through a chemical coprecipitation method, then through ball milling and powder mixing, the silver, nickel and tungsten carbide forma mechanical alloying structure, good combination between the tungsten carbide and a base body is guaranteed, operation is simple, the process is easy to control, and scaled production is realized easily.

Description

technical field [0001] The invention relates to a preparation method of an electrical contact composite material in the field of material technology, in particular to a silver tungsten carbide graphene electrical contact material and a preparation method thereof. Background technique [0002] Silver tungsten carbide composite material is one of the widely used electrical contact materials. Due to the lack of mechanical properties and electrical contact properties of pure silver, in order to meet the requirements for the use of electrical contact materials, silver-based electrical contact materials will be prepared by adding other reinforcements and silver composites. Tungsten carbide is widely used as the best reinforcement for high-current silver-based electrical contact materials. The tungsten material will generate tungstate and tungsten oxide during the process of switching on and off the large current, which will increase the contact resistance of the contact, and then...

Claims

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Application Information

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IPC IPC(8): C22C5/06C22C32/00C22C26/00C22C1/05B22F9/24B22F3/10B22F3/02B22F3/24
CPCB22F3/02B22F3/1007B22F3/24B22F9/24B22F2003/244B22F2009/245C22C1/05C22C5/06C22C26/00C22C32/0052
Inventor 王鹏鹏沈敏华毛琳陈乐生张凤磊
Owner SHANGHAI HIWAVE COMPOSITE MATERIALS CO LTD
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