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Copper-graphite-graphene brush and preparation method thereof

A technology of graphene and graphene powder, which is applied in the manufacture of brushes, circuits, collectors, etc., can solve the problems of poor mechanical performance, no electrical performance, high resistivity of brushes, etc., and achieve the use effect and life improvement, continuous The effect of stable mass production and low coefficient of friction

Active Publication Date: 2018-09-07
SHANGHAI SIMBATT ENERGY TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a copper-graphite-graphene electric brush, which is used to solve the problem of high electrical resistivity, large electric spark, large friction coefficient, no good electrical performance and good electric resistance of the electric brush used at present in China. The mechanical properties of the motor are poor and the life is short when used in the motor, which may even lead to the problem of motor damage

Method used

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  • Copper-graphite-graphene brush and preparation method thereof
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  • Copper-graphite-graphene brush and preparation method thereof

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preparation example Construction

[0053] The preparation method of the copper-graphite-graphene brush in this embodiment has low energy consumption and a simple process. It can realize automatic, continuous and stable large-scale production by using multiple mechanical devices. The production cost is low, and it has broad market application prospects.

[0054] In the copper-graphite-graphene electric brush prepared through the above steps, each composition is as follows: copper powder, the mass fraction is 35-80%, graphite powder, the mass fraction is 10-60%, graphene powder, the mass fraction is 0.5% ~30%, thermosetting resin, mass fraction is 0~20%, additive, mass fraction is 0~2.44%.

[0055] The copper-graphite-graphene brush prepared in this example uses graphene as the reinforcement of the copper-based composite material, which improves the conductivity, wear resistance, voltage drop and spark level of the existing copper-graphite brush , the copper-graphite-graphene brush in this embodiment has excellen...

Embodiment 1

[0058] Step S1: The raw material graphene powder is obtained by processing graphene obtained by mechanical exfoliation, the number of graphene layers is 10, and the size of a single sheet is 0.1um. The specification of the prepared graphene powder is 500 mesh. The 1g of raw graphene powder is dispersed in 200ml of ethyl acetate by ultrasonic waves with an oscillation frequency of 20kHz to form a graphene slurry.

[0059] Step S2: Add the graphene slurry in step S1 to the mixer, and add 10 g of 200-mesh electrolytic copper powder to the mixer, and the mixer continues to work for 24 hours, so that the graphene slurry and copper powder can be mixed uniform. The mixed material output from the mixer was evaporated to dryness by freeze-drying at -40°C for a total of 10 hours to form a graphene-copper composite powder.

[0060] Step S3: Input the graphene-copper composite powder in step S2 into a planetary ball mill, and continue to add 9 g of 150-mesh flake graphite powder and 1 g ...

Embodiment 2

[0071] Step S1: The raw material graphene powder is obtained by processing graphene obtained by mechanical exfoliation, the number of graphene layers is 1 layer, and the size of a single sheet is 100um. The specification of the prepared graphene powder is 500 mesh. 1g of raw graphene powder is dispersed in 200ml of N,N-dimethylacetamide by ultrasonic waves with an oscillation frequency of 80kHz to form a graphene slurry.

[0072] Step S2: Add the graphene slurry in step S1 to the mixer, and add 14g of 300-mesh electrolytic copper powder to the mixer, and the mixer continues to work for 10 hours, so that the graphene slurry and copper powder can be mixed uniform. The mixed material output from the mixer was evaporated to dryness by freeze-drying at -50°C for a total of 24 hours to form a graphene-copper composite powder.

[0073] Step S3: Input the graphene-copper composite powder in step S2 into a planetary ball mill, and continue to add 5 g of flake graphite powder of 300 me...

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Abstract

The invention discloses a copper-graphite-graphene brush and a preparation method thereof. The copper-graphite-graphene brush comprises 35-80% of copper powder, 10-60% of graphite powder, 0.5-30% of graphene powder and 0-20% of thermosetting resin by mass. According to the preparation method, a graphene slurry, graphene-copper composite powder, first graphene-copper-graphite composite powder, second graphene-copper-graphite composite powder, and a copper-graphite-graphene brush are obtained sequentially. The preparation method is low in cost and simple in operation and can realize automatic continuous stable large-scale production. The prepared copper-graphite-graphene brush is low in resistivity, electric spark and friction coefficient, and high in wear resistance; and compared with a traditional brush product, the electrical performance, mechanical performance and service life of the brush are improved greatly.

Description

technical field [0001] The invention relates to the technical field of brush materials and preparation, in particular to a copper-graphite-graphene brush and a preparation method thereof. Background technique [0002] A brush is a conductive part that forms an electrical connection with a sliding contact with a moving part. It is used in most DC motors and AC motors on the market and is a key component for the normal operation of the motor. The brush is usually connected to the commutator or slider on one side, and connected to the conductive spring on the other side, as a sliding contact body for importing and exporting current. Therefore, the brush should not only have excellent electrical properties but also have good mechanical properties. [0003] At this stage, the medium and low-grade brushes used in our country have low technical content and short life. In electric tool motors, such as stone cutting machines, electric wrenches, electric saw blades, electric sanders, ...

Claims

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Application Information

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IPC IPC(8): H01R39/20H01R39/22H01R43/12
CPCH01R39/20H01R39/22H01R43/12H01R2201/10
Inventor 马瑜何朋钱天宝倪亚丁古巧
Owner SHANGHAI SIMBATT ENERGY TECH CO LTD
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