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

A technology of graphene nanosheets and copper-based composite materials, applied in the direction of nanotechnology, nanotechnology, metal material coating technology, etc., can solve the problem of failure to effectively prevent direct contact, increase the porosity of composite materials, and weaken the strengthening effect of graphene etc. to achieve excellent self-lubricating properties, improve interfacial bonding strength, excellent mechanical properties and self-lubricating properties

Active Publication Date: 2019-08-27
GUANGDONG UNIV OF TECH
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  • Abstract
  • Description
  • Claims
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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.

Method used

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

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Effect test

Embodiment 1

[0031] figure 1 It is a schematic diagram of the structure of a self-supporting graphene nanosheet surface-modified copper-based composite material. Among them, 1 is a graphene nanosheet, 2 is a copper matrix, 3 is a graphene / copper composite material, 4 is a self-supporting graphene nanosheet, and 5 is a self-supporting graphene nanosheet surface-modified copper-based composite material. The self-supporting graphene nanosheet surface-modified copper-based composite material 5 of the present invention is composed of graphene nanosheets 1 and a copper matrix 2. A part of the graphene nanosheets is uniformly dispersed inside the copper matrix to form a graphene / copper-based composite material 3. A part is uniformly dispersed on the surface of the material, and a part of the plane of these graphene nanosheets is embedded in the graphene / copper-based composite material, and a part is exposed on the surface of the graphene / copper-based composite material to form a self-supporting gra...

Embodiment 2

[0033] The graphene oxide powder (purchased from Nanjing Xianfeng Nano Material Technology Co., Ltd.) was ultrasonically dispersed in deionized water to form 600ml of a dispersion with a concentration of 0.83mg / mL, and 15ml of diluted ammonia water with a concentration of 0.55mol / L was added, and after thorough stirring, Add 50ml of Ni(NO 3 ) 2 Aqueous solution. After reacting at room temperature for 1 hour, the product was filtered, rinsed with deionized water and dried, and then the dried product was reacted at 500° C. under an argon atmosphere for 1 hour to obtain nickel nanoparticle surface-modified graphene nanosheets.

[0034] figure 2 This is a TEM picture of the microstructure of the graphene nanosheets modified on the surface of the nickel nanoparticles obtained in this example. From figure 2 It can be seen that the size of the nickel nanoparticles is 10-20 nm, and they are uniformly pinned to the plane of the graphene nanosheet. Thermogravimetric analysis shows that ...

Embodiment 3

[0036] The difference from Example 2 is that the graphene oxide, ammonia and Ni(NO 3 ) 2 The concentration of the aqueous solution is 1mg / mL, 0.6mol / L, 30mmol / L, the reaction time at room temperature is 4 hours, the high temperature reaction temperature is 600℃, and the time is 2 hours, and the surface of nickel nanoparticles with a nickel mass fraction of 22.8% is obtained. Modified graphene nanosheets.

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C9/00C22C32/00C22C1/05C22C1/10B22F1/02C23C18/32C25F3/22B82Y30/00B82Y40/00
CPCC22C1/05C22C9/00C22C32/0084C23C18/32C25F3/22B82Y30/00B82Y40/00B22F1/0551B22F1/054B22F1/068B22F1/17
Inventor 陈福县麦永津揭晓华张留艳
Owner GUANGDONG UNIV OF TECH
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