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Preparation method for copper/graphene composite

A technology of graphene composite and composite materials, which is applied in the field of powder metallurgy, can solve the problems of low density, low tensile strength and hardness of sintered samples, affecting the performance of metal matrix composite materials, complex preparation process and other problems, and achieves good interface bonding, Improved hardness and good dispersibility

Inactive Publication Date: 2018-09-28
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, there are generally three problems in the existing copper / graphene composite materials: (1) the low density of graphene and the strong van der Waals force between the sheets will cause graphene to be hydrophobic and difficult to disperse in solution, resulting in Agglomeration phenomenon seriously affects the performance of metal matrix composites; (2) When graphene and metal powder are directly mechanically mixed, the interface strength is low, the density, tensile strength and hardness of the sintered sample are low, and the friction coefficient is high; (3 ) The preparation process is complex and the cost is high

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  • Preparation method for copper/graphene composite

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Embodiment 1

[0037] The invention provides a kind of preparation method of copper / graphene composite material, comprises the following steps:

[0038] (1) Weigh 3.2g of copper sulfate and dissolve it in 500ml of deionized water to obtain a copper salt solution; pipette 10ml of graphene oxide slurry into 200mL of deionized water, and ultrasonically disperse for 60min to obtain a graphene oxide dispersion; pipette 10mL Silane coupling agent KH550 in 200mL of absolute ethanol, add dilute sulfuric acid dropwise to adjust the pH value to 2.0, and stir at 80°C for 60 minutes to obtain a silane coupling agent hydrolyzate; mix the copper salt solution and the graphene oxide dispersion (m Cu :m GO =1.12:1), ultrasonically disperse for 60 minutes, heat to 70°C in a water bath, slowly drop in the silane coupling agent KH550 hydrolyzate, and keep stirring to obtain a precursor solution;

[0039] (2) Add sodium hypophosphite solution dropwise to the precursor solution, the mass ratio of sodium hypoph...

Embodiment 2

[0043] The invention provides a kind of preparation method of copper / graphene composite material, comprises the following steps:

[0044] (1) Weigh 1.6g of copper sulfate and dissolve it in 500ml of deionized water to obtain a copper salt solution; pipette 10ml of graphene oxide slurry into 200mL of deionized water, and ultrasonically disperse for 80min to obtain a graphene oxide dispersion; pipette 10mL Silane coupling agent KH560 in 200mL absolute ethanol, add dilute sulfuric acid dropwise to adjust the pH value to 2.0, and stir at 80°C for 80 minutes to obtain a silane coupling agent hydrolyzate; mix the copper salt solution and the graphene oxide dispersion (m Cu :m GO =1.12:1), ultrasonically dispersed for 30 minutes, heated to 70°C in a water bath, slowly dropped into the hydrolyzate of silane coupling agent KH560, and kept stirring to obtain a precursor solution;

[0045] (2) Add sodium hypophosphite solution dropwise to the precursor solution, the mass ratio of sodiu...

Embodiment 3

[0049] The invention provides a kind of preparation method of copper / graphene composite material, comprises the following steps:

[0050] (1) Weigh 4.8g of copper sulfate and dissolve it in 500ml of deionized water to obtain a copper salt solution; pipette 10ml of graphene oxide slurry into 200mL of deionized water, and ultrasonically disperse for 80min to obtain a graphene oxide dispersion; pipette 10mL Silane coupling agent KH540 in 200mL absolute ethanol, add dilute sulfuric acid dropwise to adjust the pH value to 2.5, and stir at 80°C for 2 hours to obtain a silane coupling agent hydrolyzate; mix the copper salt solution and the graphene oxide dispersion (m Cu :m GO =1.12:1), ultrasonically dispersed for 30 minutes, heated to 70°C in a water bath, slowly dropped into the hydrolyzate of silane coupling agent KH540, and kept stirring to obtain a precursor solution;

[0051] (2) Add sodium hypophosphite solution dropwise to the precursor solution, the mass ratio of sodium h...

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Abstract

The invention discloses a preparation method for a copper / graphene composite. The preparation method comprises the steps that (1) copper salt solution, graphene oxide dispersion liquid and silane coupling agent hydrolysate are mixed evenly, and precursor solution is obtained; (2) in situ reduction is conducted on the precursor solution, reaction products are washed and dried, and copper / graphene composite powder is obtained; (3) the copper / graphene composite powder and copper powder are mixed, and mixed powder is obtained; and (4) the mixed powder is subjected to SPS sintering, and the copper / graphene composite is obtained. According to the preparation method for the copper / graphene composite, a liquid phase method is combined with an in situ reduction method, the copper / graphene compositepowder is obtained, wherein the graphene is good in dispersibility, loads of copper nanoparticles are even, and the interface bonding property between copper and graphene is good. A spark plasma sintering means is adopted for the preparation method, finer copper crystals can be obtained, overall deformation resistance of the copper / graphene composite is enhanced, and hardness of the composite canbe improved.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy, and in particular relates to a method for preparing a copper / graphene composite material. Background technique [0002] Copper-based composite materials are widely used in various fields such as motors, construction, automobile manufacturing, and national defense. However, traditional copper-based composite materials have the disadvantages of low strength, poor heat resistance, and easy softening and deformation at high temperatures. To a certain extent, its application is limited. With the rapid development of modern industry and the sharp increase in application requirements, the market has increasingly stringent requirements on the performance of copper-based composite materials. Therefore, it is urgent to develop copper-based composite materials with excellent electrical and thermal conductivity and high strength. question. [0003] Graphene is currently the thinnest material know...

Claims

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Application Information

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IPC IPC(8): B22F3/105B22F9/24B22F1/00C22C1/05C22C9/00C22C26/00
Inventor 邹俭鹏刘咏吕信群甘子旸
Owner CENT SOUTH UNIV
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