A kind of graphene/aluminum composite conductive material and preparation method thereof

Abstract

The invention discloses a graphene / aluminum composite conductive material and a preparation method thereof. The preparation method comprises the following steps: firstly, exposing an organic polymer film to laser irradiation to prepare porous graphene; adsorbing and permeating aluminum powder particles into a porous network of graphene, and carrying out high-temperature sintering treatment to obtain a graphene / aluminum composite material precursor; and finally, sequentially treating the precursor through a pressure infiltration process, a hot extrusion process and a hot annealing process to obtain the graphene / aluminum composite conductive material. In the preparation method, the graphene in the graphene / aluminum composite conductive material is formed by directly carbonizing the organic polymer under the laser irradiation, and the part, not affected by the laser, of the organic polymer film serves as a substrate to support the graphene, so that the agglomeration of the graphene is effectively avoided, and the uniform distribution of the graphene in the composite material is achieved. Compared with pure aluminum without graphene, the electrical conductivity and mechanical propertyof the graphene / aluminum composite material are both improved.

Description

Technical field

[0001] The invention relates to the field of graphene-based composite materials, in particular to a graphene / aluminum composite conductive material and a preparation method thereof.Background technique

[0002] Graphene is a two-dimensional material with a single layer of carbon atoms forming a honeycomb structure. The carbon atoms form bonds through sp hybridization. Each carbon atom forms a σ bond with three adjacent carbon atoms, and the remaining p orbitals alternately form a conjugated π bond. Thanks to this special two-dimensional structural feature, graphene has excellent properties in terms of electricity, mechanics, and heat:

[0003] (1) Electricity: Graphene has a large π bond that allows π electrons to move freely. This gives graphene excellent conductivity, and its electron mobility can reach 15000cm2 / (V·S), approximately 140 times the electron mobility in silicon, is the material with the best conductivity at room temperature.

[0004] (2) In terms of mechanics, grap...

Examples

Embodiment 1

[0039]The invention provides a method for preparing a graphene / aluminum composite conductive material, which can solve the technical problem of uniform dispersion of graphene in the composite material, thereby achieving optimal mechanical properties and electrical conductivity.

[0040]The preparation method of graphene / aluminum composite conductive material includes the following steps:

[0041](1) Preparation of porous graphene on organic substrates

[0042]Expose one surface of an organic polymer film polyimide with a thickness of 150um to laser radiation, the laser is selected as CO with a wavelength of 10.6μm2Infrared laser, laser power is 5W, pulse frequency is 20kHz, laser scanning speed is 800mm / s. The surface of the polyimide film is carbonized to form porous graphene, that is, porous graphene on an organic substrate is obtained, and the pore structure is asfigure 2 As shown, the thickness of porous graphene is 100 microns, such asimage 3 As shown, the Raman spectrum of porous graph...

Embodiment 2

[0049]The preparation method of the graphene / aluminum composite conductor material in this embodiment is the same as that in Embodiment 1, the laser power used is 4W, and the other conditions are the same as in Embodiment 1. The tensile strength of the prepared composite material is 293Mpa, and the electrical conductivity is 60% IACS.

Embodiment 3

[0051]The preparation method of the graphene / aluminum composite conductor material in this example is the same as that in Example 1, the aluminum powder particle size used is an average of 10 μm, and the other conditions are the same as in Example 1. The tensile strength of the prepared composite material is 315Mpa, and the conductivity is 68% IACS.

Technical field

[0001] The invention relates to the field of graphene-based composite materials, in particular to a graphene / aluminum composite conductive material and a preparation method thereof.Background technique

[0002] Graphene is a two-dimensional material with a single layer of carbon atoms forming a honeycomb structure. The carbon atoms form bonds through sp hybridization. Each carbon atom forms a σ bond with three adjacent carbon atoms, and the remaining p orbitals alternately form a conjugated π bond. Thanks to this special two-dimensional structural feature, graphene has excellent properties in terms of electricity, mechanics, and heat:

[0003] (1) Electricity: Graphene has a large π bond that allows π electrons to move freely. This gives graphene excellent conductivity, and its electron mobility can reach 15000cm2 / (V·S), approximately 140 times the electron mobility in silicon, is the material with the best conductivity at room temperature.

[0004] (2) In terms of mechanics, grap...

Examples

Embodiment 1

[0039]The invention provides a method for preparing a graphene / aluminum composite conductive material, which can solve the technical problem of uniform dispersion of graphene in the composite material, thereby achieving optimal mechanical properties and electrical conductivity.

[0040]The preparation method of graphene / aluminum composite conductive material includes the following steps:

[0041](1) Preparation of porous graphene on organic substrates

[0042]Expose one surface of an organic polymer film polyimide with a thickness of 150um to laser radiation, the laser is selected as CO with a wavelength of 10.6μm2Infrared laser, laser power is 5W, pulse frequency is 20kHz, laser scanning speed is 800mm / s. The surface of the polyimide film is carbonized to form porous graphene, that is, porous graphene on an organic substrate is obtained, and the pore structure is asfigure 2 As shown, the thickness of porous graphene is 100 microns, such asimage 3 As shown, the Raman spectrum of porous graph...

Embodiment 2

[0049]The preparation method of the graphene / aluminum composite conductor material in this embodiment is the same as that in Embodiment 1, the laser power used is 4W, and the other conditions are the same as in Embodiment 1. The tensile strength of the prepared composite material is 293Mpa, and the electrical conductivity is 60% IACS.

Embodiment 3

[0051]The preparation method of the graphene / aluminum composite conductor material in this example is the same as that in Example 1, the aluminum powder particle size used is an average of 10 μm, and the other conditions are the same as in Example 1. The tensile strength of the prepared composite material is 315Mpa, and the conductivity is 68% IACS.

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