Preparation method of low-defect graphene coated aluminum powder particles

A graphene-coated, low-defect technology, applied in graphene, transportation and packaging, metal processing equipment, etc., can solve the problems of low oxidation degree of graphene, high electrical and thermal conductivity of graphene, and high defect of graphene , to achieve the effect of less structural and chemical defects, high monolayer rate and low oxidation degree

Active Publication Date: 2019-11-15
上海世系新材料有限公司
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Problems solved by technology

[0006] Aiming at the problems of high graphene defects in the method for preparing graphene / aluminum powder composite materials in the prior art, a method for preparing low-defect graphene-coated aluminum powder particles is proposed. In the graphene aluminum powder composite materials prepared by the present invention, graphene Tightly adsorbed on the surface of aluminum powder particles, graphene has low oxidation degree, few structural and chemical defects, high electrical and thermal conductivity of graphene, even without reduction, it still has good electrical and thermal conductivity

Method used

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  • Preparation method of low-defect graphene coated aluminum powder particles
  • Preparation method of low-defect graphene coated aluminum powder particles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Use commercially available graphite paper (thickness about 1mm, 0.13g) as the working electrode, clamp it with the electrode clamp, immerse in the aqueous solution of sodium sulfate electrolyte with a concentration of 0.1M, add vitamin E and vitamin E to each milliliter of aqueous solution of sodium sulfate electrolyte The added amount of 0.01g. A platinum electrode is used as a counter electrode, which is also immersed in the same electrolyte solution, and the distance between the two electrodes is about 3 cm. Connect the two electrodes to the positive and negative stages of the DC power supply, apply a voltage of 10 volts, and the graphite paper begins to expand and peel off to disperse into the electrolyte solution. When all the graphite is dispersed in the electrolyte solution in powder form, turn off the power. The graphite powder is separated from the electrolyte solution by filtration, the graphite powder is collected, and dried.

[0041] Disperse the dried gra...

Embodiment 2

[0045] The method is basically the same as in Example 1. But the thickness of graphite paper is about 2mm, about 0.25g; the electrolyte uses ammonium sulfate solution, the concentration is 0.1M; add 50mg 2,2,6,6-tetramethylpiperidine nitrogen oxide to the electrolyte solution; two The voltage applied between the electrodes was 5 volts; 15g of aluminum powder with a particle size of 10 microns was mixed with the graphene dispersion. The graphene content in the composite material obtained by drying the graphene-coated aluminum powder is about 0.015% (w / w). The ratio of graphene single layer is 75%.

[0046] The composite material powder was pressed into tablets with a stainless steel mold under a pressure of 30 MPa to obtain silver aluminum sheets. The test results show that the surface resistance of the sample after the graphene / aluminum powder composite material is pressed is 3100 ohms. The graphene-coated aluminum powder composite material was heated and reduced to graphen...

Embodiment 3

[0048] The method is basically the same as in Example 1. But the electrolyte used is a potassium sulfate solution with a concentration of 0.02M; 1g of vitamin E is added to each milliliter of the electrolyte solution; 2g of copper-doped aluminum alloy powder with a particle size of 20 microns is used as the aluminum powder to mix with the graphene dispersion. The graphene content in the composite material obtained by drying the graphene-coated aluminum powder is about 2.1% (w / w). The graphene monolayer ratio is 73%.

[0049] The composite material powder was pressed into tablets with a stainless steel mold under a pressure of 30 MPa to obtain silver aluminum sheets. The test results show that the surface resistance of the sample after the graphene / aluminum powder composite material is pressed is 640 ohms. The graphene-coated aluminum powder composite material was heated and reduced to graphene at 300°C under the protection of nitrogen for 1 hour, and then pressed into sheets...

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Abstract

The invention provides a preparation method of low-defect graphene coated aluminum powder particles. The preparation method comprises the following steps that 1) graphite is taken as an electrode, metal platinum is taken as a counter electrode, the electrode is inserted into an electrolyte aqueous solution and is connected to positive and negative electrodes of a direct current power supply, voltage is applied, current is introduced, and the graphite is expanded and dispersed in an electrolyte solution; 2) the collected expanded graphite powder is washed with water to remove electrolyte components, and then is dispersed in an organic solution, and ultrasonic treatment is carried out to obtain a graphene uniform dispersion liquid; and 3) aluminum powder or aluminum alloy powder is added into the graphene dispersion liquid, stirred and mixed, and then filtered and dried to obtain the composite aluminum powder material coated with the graphene coated aluminum powder. The graphene in the prepared graphene aluminum powder composite material is tightly adsorbed on the surface of the aluminum powder particles, the graphene oxidation degree is low, the structure and the chemical defects are few, and the electric conductivity and the heat conductivity of the composite material are high.

Description

technical field [0001] The invention relates to the technical field of metal matrix composite materials, in particular to a method for preparing low-defect graphene-coated aluminum powder particles. The method prepares low-defect graphene, and then composites it with aluminum powder particles in an organic solvent. A composite particle of graphene-coated aluminum powder was prepared. Background technique [0002] Aluminum powder is the most commonly used metal powder material, and its application range is very wide, such as military or civilian fuel, metal pigments, thermal conductivity materials, structural reinforcement materials, adsorption and catalytic materials. The diameter of commonly used aluminum powder is about 1 to tens of microns. Due to the high surface activity of aluminum powder, it is easy to form a dense oxide layer on the surface of aluminum powder particles. This oxide layer can greatly damage the excellent electrical and thermal conductivity of aluminum ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/02C01B32/19
CPCC01B32/19B22F1/142B22F1/16
Inventor 郭培仁
Owner 上海世系新材料有限公司
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