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Self-supporting graphene nano-sheet surface-modified copper-based composite and preparation method and application thereof

A graphene nanosheet, copper-based composite material technology, applied in nanotechnology, nanotechnology, metal material coating process and other directions, can solve the problem of failure to effectively prevent direct contact, increase the porosity of composite materials, and weaken the strengthening effect of graphene and other problems, to achieve the effects of excellent self-lubricating performance, improving interfacial bonding strength, excellent mechanical properties and self-lubricating performance

Active Publication Date: 2018-03-16
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 nano-sheet surface-modified copper-based composite and preparation method and application thereof
  • Self-supporting graphene nano-sheet surface-modified copper-based composite and preparation method and application thereof
  • Self-supporting graphene nano-sheet surface-modified copper-based composite and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0031] figure 1 Schematic diagram of the structure of the self-supporting graphene nanosheet surface-modified copper matrix composite. 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 a graphene nanosheet 1 and a copper matrix 2, and a part of the graphene nanosheet 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 planes of these graphene nanosheets is embedded in the interior of the graphene / copper-based composite material, and a part is exposed on the surface of the graphene / copper-based composite material, forming self-suppor...

Embodiment 2

[0033] Ultrasonic disperse graphene oxide powder (purchased from Nanjing Xianfeng Nano Material Technology Co., Ltd.) in deionized water to form 600ml of dispersion liquid with a concentration of 0.83mg / mL, add 15ml of dilute ammonia water with a concentration of 0.55mol / L, and stir thoroughly. Add dropwise 50ml of Ni(NO 3 ) 2 aqueous solution. After reacting at room temperature for 1 hour, filter, rinse with deionized water, and dry the product, and then react the dried product at 500° C. for 1 hour under an argon protective atmosphere to obtain graphene nanosheets modified on the surface of nickel nanoparticles.

[0034] figure 2 It is the TEM photograph of the microstructure of the nickel nanoparticles surface-modified graphene nanosheets obtained in this example. from figure 2 It can be seen that the size of nickel nanoparticles is 10-20nm, which are uniformly pinned on the plane of graphene nanosheets. The mass fraction of nickel in the graphene nanosheets modified...

Embodiment 3

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

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Abstract

The invention discloses a self-supporting graphene nano-sheet surface-modified copper-based composite and a preparation method and application thereof. The method comprises the steps that an Ni(NO3)2aqueous solution is dropwise added into a dispersed aqueous solution composed of oxidized graphene and dilute ammonia water, after a reaction at the room temperature, filtering, washing through deionized water and product drying are conducted, a nickel nano-particle surface-modified graphene nano-sheet is obtained after the dried product reacts in argon at the temperature of 500-600 DEG C, the nickel nano-particle surface-modified graphene nano-sheet and copper powder are stirred to be mixed and then placed in a graphite mold, a graphene / copper-based composite is obtained after heating, pressuring and sintering are conducted, the graphene / copper-based composite is used as an anode, a graphite electrode is used as a cathode, the anode and the cathode are placed in electrolytic polishing fluid, a constant voltage is applied between the anode and the cathode, copper on the surface of the graphene / copper-based composite is dissolved partially, and the self-supporting graphene nano-sheet surface-modified copper-based composite is obtained. The self-supporting graphene nano-sheet surface-modified copper-based composite can be used as a self-lubricating material and has the advantages oflow friction coefficient, low abrasion loss, 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 its preparation method and application. Background technique [0002] Copper-based solid self-lubricating composite materials can not only maintain the comprehensive properties of copper matrix, such as excellent electrical conductivity, thermal conductivity and good corrosion resistance, but also accommodate the unique lubricating properties of solid lubricants. It has a wide range of applications in the fields 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 application under harsh conditions due to poor mechan...

Claims

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Application Information

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Patent Type & Authority Applications(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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