Self-supporting graphene nanosheet surface-modified copper-based composite material and its preparation method and application

Abstract

The invention discloses a self-supporting graphene nanosheet surface-modified copper-based composite material, a preparation method and application thereof. The method is to combine Ni(NO 3 ) 2 The aqueous solution is added dropwise to the dispersed aqueous solution composed of graphene oxide and dilute ammonia water. After the reaction at room temperature, the product is filtered, rinsed with deionized water and dried. After the dried product is reacted in argon at 500-600 ° C, the surface modification of nickel nanoparticles is obtained. Graphene nanosheets are stirred and mixed with copper powder and placed in a graphite mold. After heating and pressure sintering, a graphene / copper-based composite material is obtained, and this is used as the anode, the graphite electrode as the cathode, and the two electrodes are placed in the electrolytic In the polishing solution, and a constant voltage is applied between the two electrodes, the copper component on the surface of the graphene / copper-based composite material is partially dissolved, and the surface-modified copper-based composite material of the self-supporting graphene nanosheet is obtained. It can be used as a self-lubricating material, which has the advantages of low friction coefficient, less wear, high bearing capacity and long service life.

Description

Technical field [0001] The invention belongs to the technical field of self-lubricating composite materials, and more specifically, relates to a self-supporting graphene nanosheet surface-modified copper-based composite material and a preparation method and application thereof. Background technique [0002] Copper-based solid self-lubricating composite materials can not only maintain the excellent electrical conductivity, thermal conductivity and good corrosion resistance of the copper matrix, but also contain the unique lubricating properties of solid lubricants. It has a wide range of sliding materials and electrical contact materials. Application space. However, with the rapid development of modern aerospace, high-speed trains, automobiles, and advanced weapon systems, traditional copper-based solid self-lubricating composite materials have severely limited their applications under harsh conditions due to poor mechanical properties and easy wear. Compared with conventional so...

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Problems solved by technology

The main reason for the above-mentioned contradictions is that when the content of graphene is too high, the porosity of the composite material increases, and graphene in the composite material agglomerates, which greatly weakens the strengthening effect of graphene on the mechanical properties of the composite material; however, when the graphene When the content of α is too low, it is difficult to form a layer of solid self-lubricating film with low shear strength between the contact surfaces of the friction pair. Therefore, it cannot effectively prevent the direct contact between the grinding surfaces and achieve the purpose of reducing friction and wear.

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