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Preparation method of carbon nanotube / alloy composite with directionally aligned carbon nanotubes

A technology of carbon nanotubes and alignment, which is applied in the field of preparation of carbon nanotubes/alloy composite materials, can solve the problems of difficult alignment of carbon nanotubes, high mechanical strength, and high melting point, and achieve low strength, low deformation temperature, Good dispersion effect

Active Publication Date: 2013-10-30
HENAN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high hardness, high mechanical strength and high melting point of alloy materials, the alignment of carbon nanotubes in composite materials is more difficult to achieve

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] To make a carbon nanotube / amorphous alloy composite material in which carbon nanotubes are oriented in an amorphous alloy material, and the composition of the amorphous alloy material is Zr 46.3 Cu 43.3 Al 8.9 Si 1.5 (at%), the superplastic forming temperature range is 726K~796K, the specific process steps are as follows: First, the carbon nanotube powder is repeatedly washed with alkaline solution, acidic solution and deionized water, and then Zr with uniform particle size 46.3 Cu 43.3 Al 8.9 Si 1.5 (at%) alloy powder and carbon nanotube powder are mixed evenly in proportion and put into the extrusion die. The extrusion die is composed of an upper die and a lower die. The inner diameter of the first cylinder is greater than the inner diameter of the second cylinder, and the junction is an arc transition. The inner diameter of the first cylinder is the same as the outer diameter of the upper mold, and the extrusion ratio is 4.

[0022] will be loaded with Zr 46.3...

Embodiment 2

[0026] To make a carbon nanotube / aluminum alloy composite material in which carbon nanotubes are aligned in an aluminum alloy material, the aluminum alloy is 2024Al alloy, and the superplastic forming temperature of 2024 aluminum alloy is 693K~733K. The specific process steps are as follows: The tube powder is repeatedly washed with alkaline solution, acid solution and deionized water in sequence, and then the 2024Al alloy powder with uniform particle size and carbon nanotube powder are mixed evenly in proportion and loaded into an extrusion die. The extrusion die is the same as in Example 1. Extrusion die in.

[0027] Put the extrusion mold containing 2024Al alloy powder and carbon nanotube powder into the vacuum hot pressing sintering furnace, heat the extrusion mold, and the vacuum degree in the vacuum hot pressing sintering furnace is 10 -3 Pa, the temperature is raised to 700K and kept warm, at this time, the composite material in the extrusion die presents a high plastic...

Embodiment 3

[0031] To make a carbon nanotube / magnesium alloy composite material in which carbon nanotubes are aligned in a magnesium alloy material, the magnesium alloy is AZ31 magnesium alloy, and the superplastic forming temperature range of AZ31 magnesium alloy is 673K~713K. The specific process steps are as follows: first The carbon nanotube powder is repeatedly washed with alkaline solution, acidic solution and deionized water in sequence, and then AZ31 magnesium alloy powder with uniform particle size and carbon nanotube powder are mixed evenly in proportion and then loaded into the molding mold.

[0032] Put the forming mold containing AZ31 magnesium alloy powder and carbon nanotube powder into the vacuum hot pressing sintering furnace, heat the forming mold, and the vacuum degree in the vacuum hot pressing sintering furnace is 10 -3Pa, the temperature is raised to 693K, thermally consolidated to obtain a composite material block, the mold is opened, and the composite material is ta...

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PUM

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Abstract

The invention provides a preparation method of a carbon nanotube / alloy composite with directionally aligned carbon nanotubes. The method comprises the following steps: first, evenly mixing a carbon nanotube powder and an alloy powder according to proportion, and consolidating into block blanks; then heating the block blanks to a superplastic forming temperature of the alloy material in vacuum; and finally applying external force to form a velocity gradient field in the block blanks, so that carbon nanotubes align directionally along a filament line under the effect of fluid shear stress, and cooling and solidifying to obtain the carbon nanotube / alloy composite with directionally aligned carbon nanotubes. The invention solves the problem of directional alignment of carbon nanotubes in a carbon nanotube / alloy composite, so as to give full play to the performance of carbon nanotubes.

Description

Technical field: [0001] The invention belongs to the technical field of preparation of carbon nanotube / alloy composite materials, and in particular relates to a preparation method of carbon nanotube / alloy composite materials in which carbon nanotubes are oriented. Background technique: [0002] Carbon nanotubes (CNTs) were discovered in January 1991 by Iijima, a physicist at the NEC Laboratory in Tsukuba, Japan, using a high-resolution analytical electron microscope from carbon fibers produced by the arc method. Due to their unique structure, extremely high mechanical properties, excellent electrical properties and chemical stability, carbon nanotubes have attracted widespread attention worldwide, and have broad application prospects in composite materials, hydrogen storage, sensors, field emission and other fields. The study found that aligned carbon nanotubes showed more excellent comprehensive properties. How to prepare carbon nanotubes with complete structure, high puri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C47/14C22C49/14C22C101/10
Inventor 张宝庆曹国华刘宝忠张亚宁李雷张志米国发
Owner HENAN POLYTECHNIC UNIV
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