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Method for preparing carbon nanotube reinforced aluminum-based composite material

A technology of carbon nanotubes and aluminum-based reinforcement, which is applied in the field of preparation of aluminum-based composite materials, can solve problems such as poor interface bonding, uneven dispersion of carbon nanotubes, and easy destruction of carbon nanotube structures, and achieve enhanced interface bonding, The ball milling time is short and the effect of avoiding damage

Inactive Publication Date: 2012-04-25
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method can effectively overcome the problems of uneven dispersion of carbon nanotubes in the existing carbon nanotube-reinforced aluminum matrix composites, poor bonding with the aluminum matrix interface, and easy destruction of the carbon nanotube structure during the preparation process. Compared with the matrix, the strength of the material is significantly improved, while maintaining good toughness

Method used

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  • Method for preparing carbon nanotube reinforced aluminum-based composite material
  • Method for preparing carbon nanotube reinforced aluminum-based composite material
  • Method for preparing carbon nanotube reinforced aluminum-based composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] After mixing 0.988g of cobalt nitrate hexahydrate and 19.8g of aluminum powder, add it to 150ml of absolute ethanol, evaporate to dryness with magnetic stirring at 60°C, place in an oven and dry at 80°C to obtain the precursor powder. Take a certain amount of precursor powder and place it in the constant temperature zone of the tube furnace, raise the temperature to 250°C under the protection of argon, turn off the argon, feed hydrogen at a flow rate of 100ml / min, keep it at 250°C for 1 hour, then raise the temperature to 450°C and then Keep it for 1 hour, turn off the hydrogen, pass in argon to continue to heat up to 600°C, then pass in the mixed gas of acetylene and argon (the flow rate of acetylene is 20ml / min, the flow rate of argon is 240ml / min) to react for 20 minutes, then close the mixed gas, Cool to room temperature with the furnace under the protection of argon to obtain carbon nanotube and aluminum composite powder, the content of carbon nanotube in the compos...

Embodiment 2

[0029] Concrete method and step are the same as embodiment 1, and different conditions are: feed the mixed gas of acetylene and nitrogen during catalytic cracking, wherein acetylene flow rate 30ml / min, nitrogen flow rate 300ml / min. Finally, the composite powder of carbon nanotubes and aluminum with a carbon nanotube content of 7.6wt.% was obtained.

Embodiment 3

[0031] Concrete method and step are the same as embodiment 1, and different conditions are: feed the mixed gas of ethylene and nitrogen during catalytic cracking, wherein ethylene flow rate 20ml / min, nitrogen flow rate 160ml / min. Finally, the composite powder of carbon nanotubes and aluminum with a carbon nanotube content of 5.3wt.% was obtained.

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Abstract

The invention relates to a method for preparing a carbon nanotube reinforced aluminum-based composite material and belongs to a technique for preparing aluminum-based composite materials. The method comprises: preparing composite powder in which carbon nanotubes are uniformly distributed on the surface of aluminum powder by using cobalt as a catalyst and by using a chemical vapor deposition process; allowing the carbon nanotubes to reach deep parts of the aluminum powder substrate by using a ball milling process; densifying the composite powder by a pressing and sintering process or hot pressing process to obtain a blocky material; and obtaining the carbon nanotube reinforced aluminum-based composite material through hot extrusion forming. The method has the advantages that: the aluminum particle bridging function of carbon nanotubes is fully played, and the interface combination between carbon nanotubes and the aluminum substrate is strengthened; and the ball milling time is relatively short, so the damage to the structure of carbon nanotubes in a ball milling process is avoided. The composite material prepared by the method has a much higher mechanical property than that of pure aluminum substrate and thus, has a bright industrial application prospect.

Description

technical field [0001] The invention relates to a preparation method of a carbon nanotube reinforced aluminum-based composite material, which belongs to the preparation technology of the aluminum-based composite material. Background technique [0002] Since carbon nanotubes (carbon nanotubes, referred to as CNTs) were discovered by Japanese scholar Iijima in 1991, due to their extremely high specific strength and specific stiffness, low density, and unique electrical and thermal conductivity, they are considered to be the most ideal composite materials. enhancement phase. Aluminum matrix composites have the advantages of good high temperature performance, high specific strength, high specific stiffness, good dimensional stability, low density, good thermal conductivity, and strong corrosion resistance. They are the materials of choice for the development of high-performance, lightweight structural parts. However, a large number of researches are currently focused on carbon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/05C22C21/00
Inventor 赵乃勤杨旭东师春生刘恩佐何春年蔺冀川
Owner TIANJIN UNIV
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