Preparation method of highly-orientated graphene/copper composite material with high thermal conductivity

A technology of high thermal conductivity graphite and composite materials, applied in the direction of graphene, chemical instruments and methods, metal material coating technology, etc., can solve the problems of inability to enhance thermal conductivity, achieve high thermal conductivity, reasonable design, and easy implementation Effect

Active Publication Date: 2021-11-30
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

To sum up, when graphene is used as a thermal conductivity enhancer of composite materials, the orientation treatment of graphene is the key and difficult point to give full play to the high thermal conductivity of graphene, otherwise it will not only fail to enhance the thermal conductivity, but will have adverse effects

Method used

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  • Preparation method of highly-orientated graphene/copper composite material with high thermal conductivity
  • Preparation method of highly-orientated graphene/copper composite material with high thermal conductivity
  • Preparation method of highly-orientated graphene/copper composite material with high thermal conductivity

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Experimental program
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Effect test

Embodiment 1

[0034] This embodiment includes the following steps:

[0035] Step 1. Preparation of large-diameter graphene oxide dispersion: add isopropanol to ethanol and sonicate at room temperature for 0.5 h to obtain isopropanol ethanol solution, and then add large-diameter graphene oxide sheets with a diameter greater than 5 μm to the Ultrasonic dispersion is carried out in isopropanol ethanol solution for 0.5h, and then magnesium nitrate is added to stir evenly to prepare a large-diameter graphene oxide dispersion; the volume ratio of the isopropanol to ethanol is 1:1000; the large-diameter graphite oxide The ratio of the mass of the olefin sheet to the volume of the isopropanol ethanol solution is 0.2:500, wherein the unit of mass is g, and the unit of volume is mL; the mass ratio of the magnesium nitrate to the large diameter graphene oxide sheet is 1:3 ;

[0036] Step 2, copper foil surface pretreatment and modification: put the copper foil with a thickness of 50 μm and a mass pur...

Embodiment 2

[0042] This embodiment includes the following steps:

[0043] Step 1. Preparation of large-diameter graphene oxide dispersion: add isopropanol to ethanol and sonicate at room temperature for 0.5 h to obtain isopropanol ethanol solution, and then add large-diameter graphene oxide sheets with a diameter greater than 5 μm to the Ultrasonic dispersion is carried out in isopropanol ethanol solution for 1 hour, and then magnesium nitrate is added to stir evenly to prepare a large-diameter graphene oxide dispersion; the volume ratio of the isopropanol to ethanol is 2:1000; the large-diameter graphene oxide The ratio of the mass of the sheet to the volume of the isopropanol ethanol solution is 0.1:500, wherein the unit of mass is g, and the unit of volume is mL; the mass ratio of the magnesium nitrate to the large-diameter graphene oxide sheet is 1:3;

[0044] Step 2, copper foil surface pretreatment and modification: put the copper foil with a thickness of 50 μm and a mass purity of ...

Embodiment 3

[0048] This embodiment includes the following steps:

[0049] Step 1. Preparation of large-diameter graphene oxide dispersion: add isopropanol to ethanol and sonicate at room temperature for 0.5 h to obtain isopropanol ethanol solution, and then add large-diameter graphene oxide sheets with a diameter greater than 5 μm to the Ultrasonic dispersion was carried out in isopropanol ethanol solution for 0.75h, and then magnesium nitrate was added to stir evenly to prepare a large-diameter graphene oxide dispersion; the volume ratio of the isopropanol to ethanol was 3:1000; the large-diameter graphite oxide The ratio of the mass of the olefin sheet to the volume of the isopropanol ethanol solution is 0.3:500, wherein the unit of mass is g, and the unit of volume is mL; the mass ratio of the magnesium nitrate to the large diameter graphene oxide sheet is 1:3 ;

[0050] Step 2, copper foil surface pretreatment and modification: put the copper foil with a thickness of 200 μm and a mas...

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Abstract

The invention discloses a preparation method of a highly-orientated graphene / copper composite material with high thermal conductivity. The method comprises the following steps: 1, preparing a large-flake-diameter graphene oxide dispersion liquid; 2, pretreating and modifying the surface of a copper foil; 3, preparing a graphene oxide / copper foil with preferred orientation arrangement through electrophoretic deposition; and 4, sequentially conducting folding, stacking and sintering to prepare the highly-orientated graphene / copper composite material with high thermal conductivity. According to the invention, the graphene oxide / copper foil with preferred orientation arrangement is obtained on the surface of the modified copper foil by adopting electrophoretic deposition, and the foil is folded, stacked and sintered in sequence, so large-sheet-diameter graphene oxide sheets are rotated, arranged in order and recombined to form an ordered highly-orientated graphene film, the high heat conduction characteristic of graphene is exerted, and the highly-orientated graphene / copper composite material with high thermal conductivity is obtained, and the problem that dispersity and an orientation degree are difficult to control when graphene serves as a thermal-conduction reinforcing body is solved; and interface modification and three-dimensional network connection of a copper matrix are combined, and the overall strength of the graphene / copper composite material is improved.

Description

technical field [0001] The invention belongs to the technical field of thermal management materials, and in particular relates to a preparation method of a graphene / copper composite material with high orientation and high thermal conductivity. Background technique [0002] Efficient heat dissipation is an important guarantee for maintaining the performance and safety of electronic equipment. As the thermal power density of electronic devices continues to increase, there is an urgent need for high thermal conductivity materials. The in-plane thermal conductivity of graphene is as high as 4000W / mK, which is twice that of diamond, the material with the highest thermal conductivity in bulk, and copper is also a metal with excellent thermal conductivity. Research hotspots. [0003] The existing main method for preparing graphene-reinforced copper-based composites is powder metallurgy, but the reported thermal conductivity of such copper-based composites is not high (<500W / mK)...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/184C01B32/198C21D1/26C22F1/08C23C8/64C23C14/02C23C14/16C23C14/35C25D13/02
CPCC01B32/184C01B32/198C22F1/08C21D1/26C23C14/35C23C14/165C23C14/02C23C14/021C25D13/02C23C8/64C01B2204/24
Inventor 常国李响霍望图董龙龙张伟李亮
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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