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Foamed graphene skeleton reinforced aluminum matrix composite material and preparation method thereof

A technology of foamed graphene and composite materials, which is applied in metal material coating process, gaseous chemical plating, coating, etc., which can solve the problems of multiple processing steps, high cost, and difficulty in finely controlling the connectivity of three-dimensional porous skeletons. , to achieve the effects of improved electrical conductivity and mechanical strength, improved thermal and mechanical properties, and excellent continuous thermal conductivity

Active Publication Date: 2017-10-31
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the traditional mechanical processing method is multi-dimensional processing, with many processing steps and high cost
In addition, mechanical processing is restricted by traditional mechanical processing methods and equipment, and it is difficult to finely control the internal pore size and connectivity of the three-dimensional porous framework.
Using the method of metal wire weaving, there are gaps in the three-dimensional pores, and the process is complicated.

Method used

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  • Foamed graphene skeleton reinforced aluminum matrix composite material and preparation method thereof
  • Foamed graphene skeleton reinforced aluminum matrix composite material and preparation method thereof
  • Foamed graphene skeleton reinforced aluminum matrix composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Foamed graphene skeleton reinforced aluminum matrix composite material, in this example adopts 0.3mm foamed copper as the substrate, the foamed graphene reinforcement accounts for 6% of the volume fraction of the composite material, first according to the step (1) on the foamed copper three-dimensional network substrate Cleaning, followed by step (2) using magnetron sputtering technology to deposit a molybdenum film with a thickness of 50nm on the surface of the copper foam three-dimensional network skeleton as an intermediate transition layer; A foam skeleton substrate of crystalline diamond particles; (4) adopting hot wall CVD to deposit graphene film, specifically: heating to 950° C. in an atmosphere of H2 and Ar (the flow rates of H2 and Ar during the heating process were 200 and 500 mL / min respectively , the heating rate is 33°C / min), heat treatment for 10min after the furnace temperature rises to 950°C; after the heat treatment is completed, a mixed gas of CH4, H2 ...

Embodiment 2

[0050] Graphene foam coated diamond skeleton reinforced aluminum matrix composite material. In this example, nickel foam with a pore size of 0.5 mm is used as the substrate, and the graphene foam reinforcement accounts for 30% of the volume fraction of the composite material. First, according to step (1) three-dimensional nickel foam The network substrate is cleaned, and then the chromium film with a thickness of 300nm is deposited on the surface of the foamed nickel three-dimensional network skeleton by the method of evaporation according to step (2) as an intermediate transition layer; then according to step (3), a large amount of nanocrystals are embedded in the middle of the mesh and microcrystalline diamond particle foam skeleton substrate; (4) hot wire CVD is used to deposit diamond film, deposition process parameters: hot wire distance 6mm, substrate temperature 850°C, hot wire temperature 2200°C, deposition pressure 3KPa, CH4 / H2 volume The flow rate ratio is 1:99, the d...

Embodiment 3

[0052]Foamed graphene / carbon nanotube skeleton reinforced aluminum matrix composite material. In this example, tungsten foam with a pore size of 1 mm is used as the substrate, and the foamed graphene reinforcement accounts for 12% of the volume fraction of the composite material. The network substrate is cleaned, and then the intermediate transition layer is not added, and the graphene film is directly grown in situ by chemical vapor deposition; then, according to step (3), a foam skeleton substrate inlaid with a large number of nanocrystalline and microcrystalline diamond particles in the middle of the mesh is obtained; (4) Deposit graphene film by hot-wall CVD, specifically: heating to 950°C in an atmosphere of H2 and Ar (during the heating process, the flow rates of H2 and Ar are 200 and 500mL / min, respectively, and the heating rate is 33°C / min) After the furnace temperature rises to 950°C, heat treatment for 10 minutes; after the heat treatment is completed, a mixed gas of ...

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Abstract

The invention discloses a foam graphene skeleton reinforced aluminum-base composite material and a preparation method thereof. The composite material consists of a foam substrate, a graphene reinforcing layer and a base material or is added with reinforcing particles, wherein the foam substrate is foam metal, foam ceramic or foam carbon; the base material comprises aluminum and an aluminum base alloy; and the reinforcing particles are at least one of high-thermal conductivity diamond powder, graphene and carbon nanotubes or a combination of more or high-thermal conductivity low-expansion ceramic particles for improving the mechanical strength of the composite material and reducing the coefficient of thermal expansion. In the composite material disclosed by the invention, since graphene and aluminum are continuously distributed in a three-dimensional space to form a network interpenetrating structure, remarkable influence on the thermal and electric properties of the material caused by the compound interface is weakened, the reinforcing phase can form a whole without reducing the good plasticity and toughness of the metal base in the composite material, and the heat conduction efficiency and electric conduction efficiency of the reinforcing body are maximized, so that the thermal conductivity, electric conductivity and mechanical strength of the composite material are remarkably improved over traditional composite materials; and therefore, the foam graphene skeleton reinforced aluminum-base composite material is a novel multifunctional composite material with great potential.

Description

technical field [0001] The invention discloses a foamed graphene skeleton-reinforced aluminum-based composite material and a preparation method thereof, belonging to the technical field of composite material preparation. Background technique [0002] Graphene is a two-dimensional crystal that is exfoliated from graphite material and composed of carbon atoms with only one layer of atomic thickness. In 2004, Andre Geim and Konstantin Novoselov, physicists at the University of Manchester, successfully separated graphene from graphite and confirmed that it can exist alone. Bell Prize in Physics. Graphene is both the thinnest material and the strongest, with a breaking strength 200 times stronger than the best steel. At the same time, it has good elasticity, and the stretching range can reach 20% of its own size. It is currently the thinnest and strongest material in nature. If a piece of graphene with an area of ​​1 square meter is used to make a hammock, it can bear a cat we...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/00C22C1/10C23C16/26C23C16/50
CPCC22C1/101C22C1/1036C22C21/00C22C26/00C22C2026/002C23C16/26C23C16/50
Inventor 魏秋平马莉周科朝余志明李志友叶文涛张岳峰
Owner CENT SOUTH UNIV
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