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Preparation method for graphene-reinforced copper-based composite material

A technology of copper-based composite materials and composite materials, which is applied in the field of preparation of graphene-reinforced copper-based composite materials, can solve the problems of large density difference, large size difference, and non-wetting between graphene and copper powder, and achieve graphene distribution. The effect of uniformity, broadening the application range, and improving the conductivity

Active Publication Date: 2018-06-22
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the agglomeration of multilayer graphene and the non-wetability with Cu, multilayer graphene / Cu composites prepared by traditional powder metallurgy sintering often have problems such as uneven distribution of multilayer graphene and unsatisfactory mechanical properties.
[0003] The SPS sintering process has the characteristics of fast sintering and low energy consumption compared with the traditional powder metallurgy method. The faster sintering speed can reduce the agglomeration of multi-layer graphene during the sintering process. However, due to the limitations of SPS sintering itself, it is usually only used It is suitable for powder sintering, but graphene and copper powder need to be mixed and ball milled before powder sintering. However, due to the large difference in density and size between graphene and copper powder, it is difficult to ensure the uniform mixing of graphene and copper powder by ball milling and other methods. degree, have adverse effects on the properties of the composite
[0004] Patent (CN106756195A) discloses a graphene-reinforced copper-based composite material and a preparation method thereof, in which the graphene-ethanol suspension is evenly coated on a pure copper sheet with a thickness of 0.25 mm, folded in half, compacted, and then continuously multi-layered. First rolling, followed by spark plasma sintering to finally obtain graphene-reinforced copper matrix composites. However, this method limits the graphene content to a low range due to the need to overcome extreme stress during the rolling process. , the highest volume ratio of graphene in the composite material can only reach 0.5%, so the performance enhancement effect on the material is limited

Method used

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  • Preparation method for graphene-reinforced copper-based composite material

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Effect test

Embodiment 1

[0029] (1) Place multilayer graphene with a thickness of 3-8nm and a sheet size of 5-50μm in 7.0M concentrated nitric acid, stir and heat to reflux at 120°C for 4h, dilute, filter, and dry to obtain purified multi-layer graphene; (2) disperse the purified multi-layer graphene in absolute ethanol, and obtain an ink-like suspension after ultrasonic treatment for 2 hours; (3) adopt the method of spraying to suspend the multi-layer graphene The solution is sprayed on a copper foil with a diameter of 40 mm and a thickness of 50 μm, dried, and the mass fraction of multilayer graphene is controlled to be 0.2%; (4) 50 layers of copper foil are stacked and assembled, and placed in a spark plasma sintering (SPS) furnace For sintering, control the sintering temperature to 850°C, the pressure to 20Mpa, and the holding time to 5 minutes; control the heating rate during the sintering process to 40°C / min, and use water cooling to cool the furnace after the heat preservation is completed. (5)...

Embodiment 2

[0031] (1) Place multilayer graphene with a thickness of 3-8nm and a sheet size of 5-50μm in 7.0M concentrated nitric acid, stir and heat at reflux for 4h at 120°C, dilute, filter, and dry to obtain purified multilayer graphene; (2) disperse the purified multilayer graphene in absolute ethanol, and obtain an ink-like suspension after ultrasonic treatment for 2 hours; (3) adopt the method of spraying to suspend the multilayer graphene The solution is sprayed on a copper foil with a diameter of 40 mm and a thickness of 50 μm, dried, and the mass fraction of multilayer graphene is controlled to be 0.4%; (4) 50 layers of copper foil are stacked and assembled, and placed in a spark plasma sintering (SPS) furnace For sintering, control the sintering temperature to 850°C, the pressure to 20Mpa, and the holding time to 5min; control the heating rate during the sintering process to 40°C / min, and use water cooling to cool the furnace after the heat preservation is completed. (5) The lay...

Embodiment 3

[0033](1) Place multilayer graphene with a thickness of 3-8nm and a sheet size of 5-50μm in 7.0M concentrated nitric acid, stir and heat to reflux at 120°C for 4h, dilute, filter, and dry to obtain purified multi-layer graphene; (2) disperse the purified multi-layer graphene in absolute ethanol, and obtain an ink-like suspension after ultrasonic treatment for 2 hours; (3) adopt the method of spraying to suspend the multi-layer graphene The solution is sprayed on a copper foil with a diameter of 40 mm and a thickness of 50 μm, dried, and the mass fraction of multilayer graphene is controlled to be 0.6%; (4) 50 layers of copper foil are stacked and assembled, and placed in a spark plasma sintering (SPS) furnace For sintering, control the sintering temperature to 850°C, the pressure to 20Mpa, and the holding time to 5 minutes; control the heating rate during the sintering process to 40°C / min, and use water cooling to cool the furnace after the heat preservation is completed. (5) ...

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Abstract

The invention discloses a preparation method for a graphene-reinforced copper-based composite material. The preparation method comprises the following steps that multilayer graphene is uniformly addedamong the copper foils, the layered multilayer grapheme / Cu composite material is obtained through an SPS sintering and cold rolling process, and the relative density of the obtained composite material is 95.8-99.5 %. According to the preparation method, compared with a traditional powder SPS sintering multilayer grapheme / Cu composite material, the resistivity of the obtained composite material isreduced by 11-18%.

Description

technical field [0001] The invention relates to a method for preparing a graphene-reinforced copper-based composite material, which belongs to the field of composite material preparation. Background technique [0002] With the rapid development of science and technology and social economy, the strength, hardness, wear resistance and thermal stability of traditional copper and its alloy materials are becoming more and more difficult to meet the performance requirements of copper materials in many fields, thus promoting the development of copper-based composite materials. Material development. As a typical one-dimensional nanomaterial, multilayer graphene has the characteristics of ultra-high aspect ratio, super mechanical properties, high electrical conductivity, high thermal conductivity and low thermal expansion coefficient, and is considered to be ideal for the preparation of high-performance composite materials. enhanced phase. Generally, powder metallurgy is used to ad...

Claims

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Application Information

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IPC IPC(8): C22C1/05C22C9/00
Inventor 张福勤赵炜康武世文夏莉红朱学宏
Owner CENT SOUTH UNIV
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