Metal graphene composite material and preparation method thereof

Abstract

The invention provides a metal graphene composite material and a preparation method thereof, relating to the field of materials. The metal graphene composite material comprises a metal substrate, a copper infiltration layer and a graphene film, wherein the metal substrate is in metallurgical bonding with the copper infiltration layer; the graphene film grows on the outer surface of the copper infiltration layer. The preparation method of the metal graphene composite material comprises the following steps: forming the copper infiltration layer on the surface of the substrate, and forming the graphene film on the surface of the copper infiltration layer. According to the metal graphene composite material, because graphene has excellent mechanical property, the lubricating performance of the graphene film on the surface of pure metals or alloys is greatly improved, the friction force on the surfaces of the pure metals or alloys is reduced, and the lubricating life of the pure metals or alloys is prolonged. According to the preparation method of the metal graphene composite material, graphene can grow on large-area metal materials, a copper foil does not need to be corroded, the preparation process is simple, the production cost is low, and industrial production is convenient.

Description

technical field [0001] The invention relates to the field of materials, in particular to a metal graphene composite material and a preparation method thereof. Background technique [0002] As the strongest material in the world, graphene has a Young's modulus as high as 1TPa and a low density, so it has a high E / ρ resonance frequency and is an indispensable part of the current MEMS materials. In addition, the fracture strength of graphene is as high as 130Gpa, which is 200 times that of steel. In addition to having the highest strength, it has the lowest friction coefficient and good lubrication performance. Graphene's special properties in mechanics will become one of the candidate materials for basic building blocks in future space and information technology. [0003] At present, people take advantage of the excellent lubricating properties of graphene to prepare graphene by oxidation-reduction method and transfer it on different substrates by chemical vapor deposition t...

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Problems solved by technology

Using chemical adsorption and thermal reduction of graphene oxide multi-step reaction method, redox graphene (RGO) prepared on silicon wafers has many defects and complicated processes; recently, A. Sumant, a scientist at Argonne National Laboratory in the United States, passed The commercial graphene sheet was adsorbed on the steel plate, and it was found that the friction coefficient was reduced by 85%, and the wear resistance was increased by nearly two times. The method used was mainly by adsorbing a large amount of redox graphene on the steel surface. This method has not It can realize the direct close combination of graphene and the substrate. During the friction process, the adsorbed graphene oxide cannot be guaranteed to be evenly distributed on the steel surface and is easy to graphitize; while the graphene grown by chemical vapor deposition on the copper surface needs to pass through the copper surface. After corrosion, it is transferred to the silicon wafer. The graphene measured by this method has good lubricating properties, but the load is small, and the friction life is low. The important thing is that a large amount of copper material needs to be consumed, and the material waste is serious.

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