Preparation method for in-situ synthesis of three-dimensional graphene-reinforced copper-based composite material

A copper-based composite material and in-situ synthesis technology, which is applied in the field of in-situ synthesis of three-dimensional graphene-reinforced copper-based composite materials and nanomaterial preparation, and can solve the problem of decreased strengthening effect, loss of graphene mechanical properties, and conductive structural stability. , poor mechanical properties and poor electrical and thermal conductivity

Active Publication Date: 2016-04-27
TIANJIN UNIV
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Problems solved by technology

However, the maximum reinforcement ratio achieved by the existing reported methods is only 120%. It can be seen that in the existing powder composite technology, the potential of graphene reinforcement has not been fully realized, and the mechanical properties of graphene reinforced copper matrix composites are far lower. Based on theoretical expectations, the main reasons are: (1) The graphene used in the preparation of composite materials is generally prepared by the graphite oxide reduction method. This type of redox graphene has many structural defects, poor mechanical properties, and poor electrical and thermal conductivity. Interfacial reactions are prone to occur when the matrix is ​​composited, which greatly affects the mechanical and physical properties of the composite material; (2) there is a strong van der Waals force between graphene (including redox graphene), which is very easy to agglomerate to form graphite sheets, so it is very

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  • Preparation method for in-situ synthesis of three-dimensional graphene-reinforced copper-based composite material
  • Preparation method for in-situ synthesis of three-dimensional graphene-reinforced copper-based composite material
  • Preparation method for in-situ synthesis of three-dimensional graphene-reinforced copper-based composite material

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preparation example Construction

[0023] In-situ synthesis of three-dimensional graphene-reinforced copper-based composite material preparation method, characterized in that it includes the following process:

[0024] ① Powdered copper nitrate trihydrate (Cu(NO) 3 ·3H 2 O) is the copper source, and the molar ratio of C and Cu is 3:1 to 4:1 and the solid carbon source glucose (C 6 h 12 o 6 ) or citric acid (C 6 h 8 o 7 ), mixed with water-soluble salt template sodium chloride (NaCl) according to the elemental molar ratio of Na to Cu of 100:1 to 200:1, and then added to deionized water according to the mass ratio of NaCl to water of 1:3 to 1:5 Dissolve and stir evenly with magnetic force to obtain a uniform and transparent precursor solution.

[0025] ②Put the mixed solution in step ① into the refrigerator for 12-24 hours at -20°C to obtain a solid mixed sample, then place it in a freeze dryer at -50-10°C for 24-36 hours and dehydrate Obtain dry solid powder, grind and sieve to obtain mixed powder precur...

Embodiment 1

[0032]Weigh 36.590g of sodium chloride, 0.938g of glucose, and 2.265g of copper nitrate trihydrate into a beaker, weigh 121mL of deionized water to dissolve, stir evenly (>6h) to obtain a clear solution, put it in a petri dish and freeze in the refrigerator Freeze at -20°C for 24 hours in the room; freeze-dry the frozen samples in a freeze dryer, the freeze-drying conditions are: -20°C, and the freeze-drying time is 24 hours. The freeze-dried sample was ground to obtain precursor composite powder (powder particle size ~ 100 mesh); the precursor powder was placed in a tube furnace under a hydrogen atmosphere (heating rate 10°C / min, holding temperature 750°C, holding time 2h , gas flow rate 100mL / min) calcining, after the heat preservation is completed, it is rapidly cooled to room temperature (down to 100°C within 5min), and the obtained composite powder is washed with suction filtration and water to remove the sodium chloride template, and placed in a vacuum drying oven at 80°C...

Embodiment 2

[0034] Weigh 36.590g of sodium chloride, 0.938g of glucose, and 2.265g of copper nitrate trihydrate into a beaker, weigh 121mL of deionized water to dissolve, stir evenly (>6h) to obtain a clear solution, put it in a petri dish and freeze in the refrigerator Freeze at -20°C for 24 hours in the room; freeze-dry the frozen samples in a freeze dryer, the freeze-drying conditions are: -20°C, and the freeze-drying time is 24 hours. The freeze-dried sample was ground to obtain precursor composite powder (powder particle size ~ 100 mesh); the precursor powder was placed in a tube furnace under a hydrogen atmosphere (heating rate 10°C / min, holding temperature 750°C, holding time 2h , gas flow rate 100mL / min) calcining, after the heat preservation is completed, it is rapidly cooled to room temperature (down to 100°C within 5min), and the obtained composite powder is washed with suction filtration and water to remove the sodium chloride template, and placed in a vacuum drying oven at 80°...

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Abstract

The invention relates to a preparation method for in-situ synthesis of a three-dimensional graphene-reinforced copper-based composite material. The preparation method comprises the following steps: taking copper nitrate trihydrate as a copper source, mixing the copper source with a solid carbon source (glucose or citric acid) and a water-soluble salt template (sodium chloride), then adding the mixture into water to dissolve the mixture, performing stirring uniformly to obtain a precursor solution; performing freeze-drying dehydration to obtain a mixed powder precursor; performing heating to 600-800 DEG C, performing heat preservation for 1-3 h, and then perform cooling quickly to obtain self-assembly powder; washing off sodium chloride by suction filtration, and performing vacuum drying; pouring the product into an ethanol solution of copper nitrate; performing water-bath evaporation drying and vacuum drying; under atmosphere protection, performing heating to 600-800 DEG C, performing heat preservation for 1-3 h, and obtaining three-dimensional graphene-copper particle composite powder by furnace cooling; and molding according to a vacuum hot-pressing sintering technology. The blocky material prepared according to the method has the characteristic that the graphene has good dispersity and is closely combined with a copper base; and meanwhile, the blocky material has excellent toughness and mechanical properties.

Description

technical field [0001] The invention relates to a preparation method for in-situ synthesis of three-dimensional graphene-reinforced copper-based composite materials, which belongs to the preparation technology of nanometer materials. Background technique [0002] Graphene has excellent tensile strength and elastic modulus due to its special monoatomic layer structure. Bonding force and contact area; its unique two-dimensional structure can effectively hinder the migration of dislocations and significantly reduce the expansion of fine cracks in composite materials, so it has important application value in composite materials. Copper-based composites have been widely used in the fields of electronic materials and structural materials due to their excellent mechanical properties, high electrical conductivity, thermal conductivity and other functional properties. Existing research reports have confirmed that adding graphene to the copper matrix can effectively strengthen and to...

Claims

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Application Information

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IPC IPC(8): C22C1/10C22C1/04C22C9/00B22F3/14B22F9/24
CPCB22F3/14B22F9/24B22F2003/145B22F2998/10B22F2999/00C22C1/0425C22C1/1026C22C9/00B22F2201/20
Inventor 赵乃勤张翔何春年师春生刘恩佐李家俊
Owner TIANJIN UNIV
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