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CN-121973535-A - Preparation method of graphene copper-based composite material

CN121973535ACN 121973535 ACN121973535 ACN 121973535ACN-121973535-A

Abstract

The invention discloses a preparation method of a graphene copper-based composite material, and belongs to the technical field of copper-based composite materials. The preparation method comprises the steps of (1) carrying out surface pretreatment on copper foil, (2) dripping graphene dispersion liquid on the surface of the copper foil, after the graphene dispersion liquid is freely diffused to the surface of the copper foil, covering the copper foil with the graphene dispersion liquid, drying the copper foil, (3) stacking the copper foil according to a mode that one graphene layer is arranged between two layers of copper foil, and then carrying out cold pressing and hot pressing in sequence to obtain a hot-pressed composite material, (4) carrying out annealing treatment on the hot-pressed composite material to obtain an annealed composite material, (5) carrying out cold rolling on the annealed composite material to obtain a rolled composite material, and (6) carrying out annealing treatment on the rolled composite material to obtain the graphene copper-based composite material. According to the preparation method, on the basis of simplifying the preparation flow and reducing the preparation requirement conditions, the graphene is promoted to effectively and fully play a reinforcing role, and the comprehensive properties of the composite material are improved.

Inventors

  • JIANG QINGWEI
  • ZHOU JIADONG
  • FENG JING
  • LIU XIANGYU
  • Ding Yunhang
  • Xia Chenggong
  • WANG ZHAOFEI
  • TANG DELIN

Assignees

  • 昆明理工大学
  • 烟台万隆真空冶金股份有限公司

Dates

Publication Date
20260505
Application Date
20260202

Claims (10)

  1. 1. The preparation method of the graphene copper-based composite material is characterized by comprising the following steps of: (1) Carrying out surface pretreatment on the copper foil; (2) Dropwise adding graphene dispersion liquid on the surface of the copper foil pretreated in the step (1), and drying the copper foil after the graphene dispersion liquid freely diffuses on the surface of the copper foil until the graphene dispersion liquid covers the surface of the copper foil; (3) Stacking the copper foils dried in the step (2) in a mode that one graphene layer is arranged between the two copper foils, and then sequentially carrying out cold pressing and hot pressing to obtain a hot-pressed composite material; (4) Annealing the hot-pressed composite material in the step (3) to obtain an annealed composite material; (5) Cold rolling the annealed composite material in the step (4) to obtain a rolled composite material; (6) And (3) annealing the rolled composite material in the step (5) to obtain the graphene copper-based composite material.
  2. 2. The method of claim 1, wherein the pretreatment in step (1) comprises polishing the surface of the copper foil, removing the oxide layer on the surface of the copper foil by dilute hydrochloric acid, and immersing the copper foil in absolute ethanol for ultrasonic treatment.
  3. 3. The method of claim 1, wherein in the step (2), the preparation process of the graphene dispersion liquid comprises dissolving graphene and a dispersing agent in absolute ethyl alcohol, sequentially performing ultrasonic dispersion and standing on the solution, and repeating the ultrasonic dispersion and standing processes to obtain an upper suspension liquid as the graphene dispersion liquid.
  4. 4. The method according to claim 3, wherein the dispersant is sodium dodecyl sulfate, the solid-to-liquid ratio of graphene to absolute ethanol is graphene absolute ethanol=1g:5000 ml, and the solid-to-liquid ratio of dispersant to absolute ethanol is dispersant absolute ethanol=1g:50000 ml.
  5. 5. The method of claim 3, wherein the solution is subjected to ultrasonic dispersion at a frequency of 40-80 kHz for 30min, and then allowed to stand for 5min, and the ultrasonic dispersion and standing process is repeated for 4 times.
  6. 6. The method of claim 1, wherein in the step (3), the cold pressing pressure is 40t and the cold pressing time is 0.5h.
  7. 7. The method of claim 1, wherein in the step (3), the hot pressing pressure is 50t, the hot pressing temperature is 400-500 ℃, and the hot pressing time is 2h.
  8. 8. The method of claim 1, wherein in the steps (4) and (6), the annealing temperature is 250-400 ℃, the holding time is 10-90 min, and the heating rate is 5-25 ℃.
  9. 9. The method according to claim 1, wherein the cold rolling deformation in the step (5) is 20%.
  10. 10. The method for preparing a porous ceramic material according to claim 1 to 9, wherein the graphene is one of two-dimensional graphene and three-dimensional graphene.

Description

Preparation method of graphene copper-based composite material Technical Field The invention belongs to the technical field of copper-based composite materials, and particularly relates to a preparation method of a graphene copper-based composite material. Background Copper has wide application in the fields of electronics, power, machinery, energy sources and the like due to excellent electrical conductivity, thermal conductivity and good mechanical properties, however, pure copper has poor mechanical properties, and is difficult to meet the increasingly severe use requirements of industrial technologies. Therefore, the copper-based composite material is generally obtained by introducing a reinforcing phase into a copper matrix, so that the mechanical property of the copper-based composite material is improved, and the electric conductivity and the heat conductivity of the copper-based composite material are further improved. Graphene is an ideal reinforcement for copper-based composites due to its excellent mechanical properties, electrical conductivity, and thermal conductivity. At present, main preparation methods of the graphene reinforced copper-based composite material comprise a ball milling method, a molecular level mixing method, an electrochemical deposition method, a chemical vapor deposition method, a powder metallurgy method and the like. The method comprises the steps of preparing a composite material by a molecular-level mixing valve mainly through oxidation and reduction processes, wherein defects are easily introduced in the oxidation and reduction processes, the preparation process is complicated, large-scale application of the composite material is limited, graphene oxide and copper ions in electrolyte are commonly deposited on the surface of a cathode by an electrochemical deposition method mainly through current application, the graphene is easy to agglomerate in the deposition process, the performances of the composite material such as electric conduction and heat conduction are affected, the graphene consumption, electrolyte components and electrochemical condition control precision are required to be high, the composite material is prepared by in-situ generating graphene on the surface of a copper matrix by a chemical vapor deposition method at a high temperature, but the chemical vapor deposition method requires a high-temperature environment and a vacuum environment, the conditions are strict, the process flow is complex, the cost is high, the copper-carbon interface reaction is easily initiated by the high-temperature condition of the chemical vapor deposition, brittle copper carbide is formed, the interface is weakened, and the uniformity of the composite material is difficult to agglomerate due to the large dispersion difference of the graphene and the high density in powder metallurgy. In addition, in the composite material, the interface combination of the graphene and the copper matrix is weak, so that local stress concentration or electric conduction/heat conduction path fracture is easy to form, and the comprehensive performance of the material is affected. Therefore, it is necessary to provide a preparation method of the graphene copper-based composite material, which effectively improves the distribution uniformity of graphene, simplifies the preparation process, reduces the condition requirements, and further improves the comprehensive properties of the composite material such as mechanical property, electric conduction and heat conduction properties. Disclosure of Invention In order to overcome the problems in the background art, the graphene copper-based composite material is prepared by utilizing the processes of free diffusion of graphene dispersion liquid, combined stacking, cold pressing, hot pressing and the like, so that the uniformity of graphene in a copper matrix is improved, the interface bonding strength between the graphene and the copper matrix is improved, the reinforcing effect of the graphene is fully exerted, and the mechanical, electrical and thermal properties of the composite material are effectively improved. In order to achieve the above purpose, the present invention is realized by the following technical scheme: the invention provides a preparation method of a graphene copper-based composite material, which comprises the following steps: (1) And carrying out surface pretreatment on the copper foil. (2) And (3) dropwise adding graphene dispersion liquid on the surface of the copper foil pretreated in the step (1), and drying the copper foil after the graphene dispersion liquid freely diffuses on the surface of the copper foil until the graphene dispersion liquid covers the surface of the copper foil. (3) Stacking the copper foils dried in the step (2) in a mode that one graphene layer is arranged between two copper foils, and then sequentially carrying out cold pressing and hot pressing to obtain the hot-pressed composite material. (4) And (3) a