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Preparation method of high-strength and high-thermal-conductivity carbon nanotube reinforced magnesium-based composite material

A carbon nanotube and composite material technology, applied in the field of magnesium-based composite material preparation, can solve the problems of high strength and high thermal conductivity, high cost, high alloy density, etc., to achieve tight combination, short process and low density Effect

Active Publication Date: 2019-12-03
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the existing heat-conducting magnesium alloys that use too many rare earth elements or high-priced alloy elements, resulting in high cost, high alloy density, high strength and high thermal conductivity, etc., the present invention provides a rare earth-free, low-cost Preparation method of magnesium-based composite material with simple components, high strength and high thermal conductivity

Method used

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  • Preparation method of high-strength and high-thermal-conductivity carbon nanotube reinforced magnesium-based composite material
  • Preparation method of high-strength and high-thermal-conductivity carbon nanotube reinforced magnesium-based composite material
  • Preparation method of high-strength and high-thermal-conductivity carbon nanotube reinforced magnesium-based composite material

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Effect test

Embodiment 1

[0019] Mix pure magnesium powder, zinc powder and carbon nanotubes evenly and press them into blocks. The specific components of the block are Mg: 95.95wt.%, Zn: 4wt.%, CNTs: 0.05wt.%. The prepared composite block The body is placed in a vacuum tube furnace with a vacuum of -10 5 Pa, react in situ at 360°C for 1 hour, and then cool with the furnace; through the back extrusion process, the in situ reacted block is back extruded into a rod, and then the rod is placed in a furnace with a protective atmosphere (argon) Inside, artificial aging at 160°C for 9h, and finally cooled to room temperature to obtain a carbon nanotube-reinforced magnesium-based composite material with a tensile strength of 290MPa and a thermal conductivity of 145W / (m·K).

Embodiment 2

[0021] Mix pure magnesium powder, zinc powder and carbon nanotubes evenly and press them into blocks. The specific components of the block are Mg: 93.8wt.%, Zn: 6wt.%, CNTs: 0.2wt.%. The prepared composite block The body is placed in a vacuum tube furnace with a vacuum of -10 5 Pa, react in situ at 400°C for 2 hours, and then cool with the furnace; through the back extrusion process, the block after the in situ reaction is back extruded into a rod, and then the rod is placed in a furnace with a protective atmosphere (argon) Inside, artificial aging at 175°C for 12h, and finally cooled to room temperature to obtain a carbon nanotube-reinforced magnesium-based composite material with a tensile strength of 320MPa and a thermal conductivity of 128W / (m·K).

Embodiment 3

[0023] Mix pure magnesium powder, zinc powder and carbon nanotubes evenly and press them into blocks. The specific components of the block are Mg: 93.6wt.%, Zn: 6wt.%, CNTs: 0.4wt.%. The prepared composite block The body is placed in a vacuum tube furnace with a vacuum of -10 5 Pa, react in situ at 400°C for 2 hours, and then cool with the furnace; through the back extrusion process, the block after the in situ reaction is back extruded into a rod, and then the rod is placed in a furnace with a protective atmosphere (argon) Inside, artificial aging at 175°C for 12h, and finally cooled to room temperature to obtain a carbon nanotube-reinforced magnesium-based composite material with a tensile strength of 342MPa and a thermal conductivity of 140W / (m·K).

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Abstract

The invention discloses a preparation method of a high-strength and high-thermal-conductivity carbon nanotube reinforced magnesium-based composite material, and relates to the technical field of metal-based composite material preparation. In the method, carbon nanotubes are added into an alloy through a powder metallurgy process, and then the carbon nanotube reinforced metal-based composite material is prepared through in-situ reaction, hot extrusion, direct aging treatment and other processes subsequently. The method disclosed by the invention has the advantages of capable of achieving mass production, simple process method, uniform dispersion of the carbon nanotubes, high content, small environmental pollution and the like, and has a wide potential application prospect in the fields of aerospace, automobiles, 3C and the like.

Description

technical field [0001] The invention relates to the field of preparation of magnesium-based composite materials, in particular to a preparation method of high-strength and high-thermal-conductivity carbon nanotube-reinforced magnesium-based composite materials. Background technique [0002] Magnesium and its alloys have received great attention as the lightest metal structure materials at present, and their applications in civil and military fields are becoming more and more extensive. The thermal conductivity of pure magnesium reaches 158W / (m.K), second only to copper and pure aluminum in metal materials, so it has development advantages in fields that have special requirements for mechanical properties and heat dissipation performance. However, the mechanical properties of pure magnesium are poor, and the tensile strength in the as-cast state is about 21 MPa, which severely limits its application depth. At present, in view of the lack of mechanical properties of magnesium...

Claims

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Application Information

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IPC IPC(8): C22C23/04C22C1/05C22C1/10
CPCC22C1/05C22C23/04C22C26/00C22C2026/002
Inventor 杜文博侯江涛王朝辉李淑波刘轲杜宪
Owner BEIJING UNIV OF TECH
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