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Preparation method of carbon nanotube strengthened aluminum-based composite material

A composite material and carbon nanotube technology, which is applied in the field of preparation of carbon nanotube reinforced aluminum matrix composite materials, can solve the problems of unsatisfactory physical properties, poor wettability, affecting the electrical conductivity and thermal conductivity of composite materials, and achieves easy large-scale production. , The effect of simple equipment and simple process

Active Publication Date: 2016-07-06
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The wettability between intact CNTs and metal substrates such as Al is poor, and Al is easy to form between damaged CNTs and Al 4 C 3 Compound, non-wetting or compound interface all seriously affect the electrical and thermal conductivity of the composite material, resulting in unsatisfactory physical properties

Method used

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  • Preparation method of carbon nanotube strengthened aluminum-based composite material
  • Preparation method of carbon nanotube strengthened aluminum-based composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Preparation of composite precursor powder: carbon nanotubes (purity 95%) and pure aluminum powder (purity 99.5%, average particle size 50 μm) together with a certain number of balls are placed in a ball mill jar under an inert gas protective atmosphere , add a small amount of ethanol as a process control agent; the ratio of ball to material is 5:1, and the speed of the ball mill is 400r / min; in order to reduce the temperature rise of the composite powder during the ball mill, the ball mill rotates forward for 30 minutes, then pauses for 30 minutes, and then reverses for 30 minutes , carried out in such a cycle, and accumulated ball milling for 1 hour; after ball milling, the precursor composite powder of CNTs / Al with good dispersion of CNTs was obtained, the mass percentage of carbon nanotubes in the precursor composite powder was 0.5%, and the mass percentage of pure aluminum powder was 99.5% .

[0027] (2) Compression and sintering of composite powder: cold press ...

Embodiment 2

[0032](1) Preparation of composite precursor powder: carbon nanotubes (purity 96%) and pure aluminum powder (purity 99.9%, average particle size 25 μm) together with a certain number of balls are placed in a ball mill jar under an inert gas protective atmosphere , add a small amount of ethanol as a process control agent; the ratio of ball to material is 10:1, and the speed of the ball mill is 150r / min; in order to reduce the temperature rise of the composite powder during the ball mill, the ball mill rotates forward for 30 minutes, then pauses for 30 minutes, and then reverses for 30 minutes , carried out in such a cycle, and accumulated ball milling for 6 hours; after ball milling, the precursor composite powder of CNTs / Al with good dispersion of CNTs was obtained. The mass percentage of carbon nanotubes in the precursor composite powder was 2%, and the mass percentage of pure aluminum powder was 98%. .

[0033] (2) Compression and sintering of composite powder: cold press th...

Embodiment 3

[0038] (1) Preparation of composite precursor powder: carbon nanotubes (purity 96%) and pure aluminum powder (purity 99.9%, average particle size 25 μm) together with a certain number of balls are placed in a ball mill jar under an inert gas protective atmosphere , add 8ml of ethanol as a process control agent; the ratio of ball to material is 20:1, and the speed of the ball mill is 400r / min; in order to reduce the temperature rise of the composite powder during the ball mill, the ball mill rotates forward for 30 minutes, then pauses for 30 minutes, and then reverses for 30 minutes , carried out in such a cycle, and accumulated ball milling for 24 hours; after ball milling, the precursor composite powder of CNTs / Al with good dispersion of CNTs was obtained, the mass percentage of carbon nanotubes in the precursor composite powder was 5%, and the mass percentage of pure aluminum powder was 95% .

[0039] (2) Compression and sintering of composite powder: use a steel mold to coo...

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Abstract

The invention relates to a preparation method of a carbon nanotube strengthened aluminum-based composite material, and belongs to the technical field of preparation of metal-based composite materials. The preparation method comprises the following steps: taking carbon nanotubes (CNTs), pure aluminum powder and pure aluminum round rods as raw materials, preparing the CNTs and the pure aluminum powder into precursor composite powder by adopting a high-energy ball milling method, preparing the precursor composite powder into a cylindrical sintered blank through a room temperature compaction and sintering process, and processing the pure aluminum round rods into a cylindrical blank same as the sintered blank in the aspect of diameter; and extruding the two blanks into a composite rod material by adopting a composite hot extrusion process, carrying out follow-up deformation processing on the composite rod material by adopting drawing and rolling processes, and carrying out annealing to obtain the high-strength high conductivity pure aluminum-coated carbon nanotube strengthened aluminum-based composite material. According to the preparation method, composite extrusion is carried out on the pure aluminum and the CNTs / Al composite material creatively, and the pure aluminum is coated outside the CNTs / Al when deformation processing is carried out on the CNTs / Al, so as to obtain the high-strength high-conductivity CNTs strengthened aluminum-based composite material. The method is simple and convenient in process, simple in equipment and easy to realize large-scale production.

Description

technical field [0001] The invention relates to a method for preparing a carbon nanotube-reinforced aluminum-based composite material, and belongs to the technical field of metal-based composite material preparation. Background technique [0002] Due to its excellent physical and chemical properties such as high specific strength and specific stiffness, good high temperature performance, fatigue resistance, wear resistance, good damping performance, and low thermal expansion coefficient, aluminum matrix composites (AMCs) have become the most commonly used and most important metal matrix composite materials. One of the materials, it is widely used in the fields of transportation, aerospace, weaponry, electronic packaging and devices. For example, DWA Company of the United States replaced 7075 with 25% SiCp / 6061 aluminum-based composite materials to manufacture guide grooves and angle materials for aerospace structures, reducing its density by 17% and increasing its modulus by...

Claims

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Application Information

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IPC IPC(8): C22C1/05C22C1/10C22C21/00B21C37/02B21C37/04B21C23/24
CPCC22C1/05C22C21/00C22C26/00B21C23/24B21C37/02B21C37/042C22C2026/002
Inventor 李才巨刘孝青易健宏汤金金朱心昆陶静梅
Owner KUNMING UNIV OF SCI & TECH
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