Preparation method of high-strength high-toughness graphene/metal composite material

A metal composite material, high-strength and high-toughness technology, applied in metal processing equipment, transportation and packaging, etc., can solve the problems of poor bonding between graphene and metal interfaces, easy agglomeration, uneven dispersion of graphene, etc., and achieve a compact structure , good combination, satisfying the effect of industrial application

Inactive Publication Date: 2019-01-29
LANZHOU JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention aims at problems such as poor combination of graphene and metal interface, uneven dispersion of graphene after mixing, and prone to agglomeration, etc., adopting graphene that can not only prepare neural network structure, but also avoid layering after mixing graphene and copper problem, ensuring that the composite powder is evenly mixed

Method used

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  • Preparation method of high-strength high-toughness graphene/metal composite material
  • Preparation method of high-strength high-toughness graphene/metal composite material

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Graphene oxide (with a sheet diameter of 20 μm and a thickness of 2 nm) was dispersed in an aqueous solution and ultrasonically dispersed for 1 h to prepare a graphene oxide solution with a concentration of 2 mg / mL. Then heated in a water bath at 80 °C for 20 min and quickly poured into liquid nitrogen. Melt the frozen graphene oxide and mix it with 10 μm flake copper powder (graphene oxide volume fraction is 1%) in water / alcohol solution (v:v=1:9) at high shear speed. is 10000 rpm, and the mixing time is 1 h to obtain a graphene-copper mixed dispersion. The mixed dispersion was quickly placed in liquid nitrogen to freeze to form a solid, and then freeze-dried for 48 h to obtain graphene / copper composite powder. The graphene / copper powder was transferred to a tube furnace and reduced at 300 °C for 60 min in an argon / hydrogen (9:1 v / v) atmosphere. The thermally reduced composite powder was subjected to spark plasma sintering at a sintering temperature of 700 °C, a sint...

Embodiment 2

[0030] Graphene oxide (with a sheet diameter of 20 μm and a thickness of 2 nm) was dispersed in an aqueous solution and ultrasonically dispersed for 1 h to prepare a graphene oxide solution with a concentration of 1 mg / mL. Then heated at 80 °C water area temperature for 20 min and quickly poured into liquid nitrogen. The frozen graphene oxide was melted and mixed with 5 μm spherical copper powder (graphene oxide volume fraction 1%) in water / alcohol solution (v:v=1:9) at high shear speed. 10000 rpm, the mixing time is 2 h, and the graphene-copper mixed dispersion is obtained. The mixed dispersion was quickly poured into liquid nitrogen to freeze to form a solid, and then freeze-dried for 48 h to obtain graphene / copper composite powder. The graphene-copper powder was transferred to a tube furnace and reduced at 400 °C for 60 min in an argon / hydrogen (9:1 v / v) atmosphere. The thermally reduced composite powder was subjected to spark plasma sintering at a sintering temperature o...

Embodiment 3

[0032]Graphene oxide (with a sheet diameter of 10 μm and a thickness of 2 nm) was dispersed in an aqueous solution and ultrasonically dispersed for 1 h to prepare a graphene oxide solution with a concentration of 1 mg / mL. Then heated in a water bath at 60 °C for 20 min and then quickly poured into liquid nitrogen. Melt the frozen graphene oxide and mix it with 2 μm aluminum powder (graphene oxide volume fraction is 1%) in water / alcohol solution (v:v=1:9) at high shear speed at 10000 rpm, and the mixing time was 1 h to obtain a graphene-aluminum mixed dispersion. The mixed dispersion was quickly placed in liquid nitrogen to freeze to form a solid, and then freeze-dried for 48 h to obtain graphene / aluminum composite powder. The graphene-aluminum composite powders were transferred to a tube furnace and reduced at 300 °C for 60 min in an argon / hydrogen (9:1 v / v) atmosphere. The thermally reduced composite powder was subjected to spark plasma sintering at a sintering temperature ...

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Abstract

The invention relates to a preparation method of a graphene/metal composite material, and belongs to the technical field of metal-based composite materials. The method comprises the following steps ofpreparing a graphene oxide solution with certain concentration, and quickly pouring the graphene oxide solution into liquid nitrogen after water-bath heating; melting the frozen solid of the grapheneoxide solution, then carrying out high-speed shearing to uniformly mix the melted graphene oxide solution with metal powder in an ethanol/water solution, and then placing the mixture into the liquidnitrogen again for rapid freezing to obtain graphene oxide/metal composite powder after freezing and drying. After being subjected to thermal reduction, the composite powder becomes the high-density graphene/metal composite material through spark plasma sintering. Due to the fact that the graphene in the prepared graphene/metal composite material is of a neural network structure, the strength of the composite material can be improved while the toughness of a metal base body is maintained, and the performance of the composite material is obviously superior to that of composite materials of thesame type. The process method is simple and feasible, and the steps are easy to operate; and the process method is high in safety and reliability, low in cost and suitable for large-scale production.

Description

technical field [0001] The invention belongs to the technical field of metal-matrix composite materials, and in particular relates to a preparation method of graphene-reinforced metal-matrix composite materials with a neural network structure. Background technique [0002] The rapid development of modern industry has put forward higher requirements for the mechanical properties of metal matrix composites. The addition of traditional fiber and particle reinforcements such as oxides and carbide nanoparticles can improve the strength of metal matrix composites and at the same time The toughness of the metal decreases significantly. Therefore, the research and development of metal matrix composites with high strength and high toughness has become a hot spot in the research of metal matrix composites. [0003] Graphene is a carbon atom with sp 2 The planar honeycomb structure composed of hybrid orbitals is a two-dimensional material with a thickness of only one carbon atom, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F3/105
CPCB22F1/0003B22F3/105B22F1/068
Inventor 褚克王钒魏小平耿中荣黄大建李渊博康皓
Owner LANZHOU JIAOTONG UNIV
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