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Preparation method of carbon nanotube enhanced copper-based composite material

A copper-based composite material and carbon nanotube technology, applied in the field of composite material preparation, can solve the problems of large density difference between CNTs and copper powder, affect composite materials, reduce aspect ratio, etc., achieve uniform distribution of MWCNTs, widen application range, The effect of improved electrical conductivity

Active Publication Date: 2018-06-05
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the agglomeration of CNTs and the non-wetability with Cu, the CNTs / Cu composite materials prepared by traditional powder metallurgy sintering often have problems such as uneven distribution of CNTs, unsatisfactory electrical conductivity and 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 CNTs during the sintering process. However, due to the limitations of SPS sintering itself, it is usually only used for powder sintering. , but in the process of preparing CNTs-reinforced copper-based composite materials by powder gold method, ball milling and mixing are required, and the ball milling process often leads to the cutting of CNTs and reducing its aspect ratio. In addition, the density difference between CNTs and copper powder is large. The size difference is large, and it is difficult to ensure the uniformity of the mixing of CNTs and copper powder by ball milling and other methods, and improper setting of ball milling parameters may lead to cold welding between copper powders and is not conducive to sintering, so even if SPS is used, it is difficult to obtain a dense composite At the same time, it is impossible to completely avoid the agglomeration of CNTs, both of which will affect the final performance of the composite material, especially the electrical conductivity of the composite material

Method used

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  • Preparation method of carbon nanotube enhanced copper-based composite material
  • Preparation method of carbon nanotube enhanced copper-based composite material

Examples

Experimental program
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Effect test

Embodiment 1

[0030] (1) Put multi-walled carbon nanotubes (MWCNTs) with a length of 10-30 μm and a diameter of <8 nm in 7.0 M concentrated nitric acid, stir and heat to reflux at 120 ° C for 4 hours, dilute, filter, and dry to obtain purification MWCNTs; (2) Disperse the purified MWCNTs in absolute ethanol and ultrasonically treat them for 2 hours to obtain an ink-like suspension; (3) Spray the MWCNTs suspension on a surface with a diameter of 40 mm and a thickness of 50 μm copper foil, drying, and controlling the mass fraction of MWCNTs to 0.2%; (4) Assembling 60 layers of copper foil, sintering and forming in a spark plasma sintering (SPS) furnace, controlling the sintering temperature to 850 ° C, pressure The heat preservation time is 20Mpa, and the holding time is 5min; the heating rate during the sintering process is controlled to be 40°C / min. After the heat preservation is completed, the furnace is cooled by water cooling. (5) The layered composite material after sintering is cold-ro...

Embodiment 2

[0032](1) Put multi-walled carbon nanotubes (MWCNTs) with a length of 10-30 μm and a diameter of <8 nm in 7.0 M concentrated nitric acid, stir and heat to reflux at 120 ° C for 4 hours, dilute, filter, and dry to obtain purification MWCNTs; (2) Disperse the purified MWCNTs in absolute ethanol and ultrasonically treat them for 2 hours to obtain an ink-like suspension; (3) Spray the MWCNTs suspension on a surface with a diameter of 40 mm and a thickness of 50 μm copper foil, dried, and the mass fraction of MWCNTs was controlled to be 0.4%; (4) 50 layers of copper foil were stacked and assembled, placed in a spark plasma sintering (SPS) furnace for sintering, and the sintering temperature was controlled at 850 ° C, pressure The heat preservation time is 20Mpa, and the holding time is 5min; the heating rate during the sintering process is controlled to be 40°C / min. After the heat preservation is completed, the furnace is cooled by water cooling. (5) The layered composite material ...

Embodiment 3

[0034] (1) Put multi-walled carbon nanotubes (MWCNTs) with a length of 10-30 μm and a diameter of <8 nm in 7.0 M concentrated nitric acid, stir and heat to reflux at 120 ° C for 4 hours, dilute, filter, and dry to obtain purification MWCNTs; (2) Disperse the purified MWCNTs in absolute ethanol and ultrasonically treat them for 2 hours to obtain an ink-like suspension; (3) Spray the MWCNTs suspension on a surface with a diameter of 40 mm and a thickness of 50 μm copper foil, drying, and controlling the mass fraction of MWCNTs to 0.6%; (4) Assembling 50 layers of copper foil, sintering and forming in a spark plasma sintering (SPS) furnace, controlling the sintering temperature to 850 ° C, pressure The heat preservation time is 20Mpa, and the holding time is 5min; the heating rate during the sintering process is controlled to be 45°C / min, and after the heat preservation is completed, the furnace is cooled by water cooling. (5) The layered composite material after sintering is col...

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Abstract

The invention discloses a preparation method of a carbon nanotube enhanced copper-based composite material. The preparation method comprises the following steps: uniformly adding MWCNTs (Multi-walledCarbon Nanotubes) between copper foils; carrying out an SPS (Spark Plasma Sintering) and cold rolling technology to obtain a laminar MWCNTs / Cu composite material thin belt. The relative density of anobtained MWCNTs / Cu composite material is 94.3 to 98.6 percent. Compared with a traditional powder SPS MWCNTs / Cu composite material, the resistivity is reduced by 10 percent to 16 percent and the yieldstrength is equivalent.

Description

technical field [0001] The invention relates to a method for preparing a carbon nanotube-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, CNTs have ultra-high aspect ratio, super mechanical properties, high electrical conductivity, high thermal conductivity, and low thermal expansion coefficient, and are considered to be ideal reinforcing phases for preparing high-performance composite materials. Generally, powder metallurgy is used to add CNTs to the metal matrix to impro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/10C22C9/00C22C26/00
CPCC22C1/10C22C1/101C22C9/00C22C26/00C22C2026/002
Inventor 张福勤武世文赵炜康夏莉红朱学宏
Owner CENT SOUTH UNIV
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