Preparation method of homodisperse carbon nano tube enhanced aluminium base composite material

An aluminum-based composite material and uniform dispersion technology, which is applied in the field of preparation of uniformly dispersed carbon nanotube-reinforced aluminum-based composite materials, can solve the difficult problem of carbon nanotube agglomeration, poor process stability and reproducibility, and difficult batch production Production and other problems, to achieve the effect of complete structure, good combination and good crystallization degree

Inactive Publication Date: 2010-10-20
TIANJIN UNIV
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] ① After the aluminum powder and carbon nanotubes are manually ground or dispersed by ultrasonic stirring in ethanol, they are pressed and sintered to shape. Although this method is simple, it is difficult to solve the problem of agglomeration of carbon nanotubes on the aluminum matrix; After nanotubes and aluminum powder are mixed, they are pressed and sintered
The disadvantages of this method: ① Alkaline solution is added as a precipitating agent in the process of preparing Ni catalyst by chemical deposition precipitation method, and aluminum is easy to react with alkali, so it is difficult to avoid the formation of alumina, which ultimately affects the performance of composite materials; ② The process of this method is cumbersome, there are many influencing factors, the stability and reproducibility of the process are poor, and it is difficult to produce in batches

Method used

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  • Preparation method of homodisperse carbon nano tube enhanced aluminium base composite material
  • Preparation method of homodisperse carbon nano tube enhanced aluminium base composite material
  • Preparation method of homodisperse carbon nano tube enhanced aluminium base composite material

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Mix 0.424g of nickel acetate tetrahydrate with 19.9g of aluminum powder, add to 120ml of absolute ethanol, evaporate to dryness with magnetic stirring at 60°C, place at room temperature for 24 hours and dry to obtain the precursor powder. Take a certain amount of 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, pass in hydrogen at a flow rate of 200mL / min, keep it at 250°C for 1 hour, then raise the temperature to 450°C and keep it for 2 hours. hour, turn off the hydrogen, feed argon and continue to heat up to 600°C, then feed a mixed gas of methane and argon (methane flow rate 60mL / min, argon flow rate 420mL / min) and react for 15 minutes. Cool to room temperature with the furnace under gas protection to obtain carbon nanotube and aluminum composite powder, the content of carbon nanotube in the composite powder is 1.3wt.%. The composite powder was pressed into a bl...

Embodiment 2

[0030] Mix 0.53g of nickel acetate tetrahydrate with 2.38g of aluminum powder, add to 120ml of absolute ethanol, evaporate to dryness with magnetic stirring at 70°C, place at room temperature for 24 hours and dry to obtain the precursor powder. Take a certain amount of 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 150mL / min, keep it at 250°C for 1 hour, then raise the temperature to 450°C and keep it for 1 hour. Hours, turn off the hydrogen, feed argon to continue to heat up to 600 ° C, then feed a mixed gas of methane and argon (methane flow rate 60mL / min, argon flow rate 420mL / min) after 1 hour of reaction, close the mixed gas, Cool down to room temperature with the furnace under gas protection to obtain carbon nanotube and aluminum composite powder. The carbon nanotube content in the composite powder is 9.8wt.%.

Embodiment 3

[0032] The specific method and steps are the same as in Example 2, except that the different conditions are: the temperature of vapor phase deposition and growth of carbon nanotubes is 450°C, and finally a carbon nanotube and aluminum composite powder with a carbon nanotube content of 10.7wt.% is obtained.

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Abstract

The invention relates to a preparation method of a homodisperse carbon nano tube enhanced aluminium base composite material and belongs to the preparation technology of an aluminium base composite material. The method comprises the following steps: preparing catalyst precursor powder from nickel salt and aluminite powder by a dipping method; preparing Ni / Al catalyst by calcining the precursor powder, and then reducing the calcined precursor powder by utilizing hydrogen, or directly reducing the precursor powder by utilizing the hydrogen; carrying out catalytic pyrolysis reaction on the Ni / Al catalyst in a tubular furnace and the mixing gas of the introduced carbon source gas and carrier gas to prepare the composite powder of the carbon nano tube and aluminum; and preparing the homodisperse carbon nano tube enhanced aluminium base composite material block by carrying out cold pressing, sintering and hot extruding on the composite powder of the carbon nano tube and the aluminum. The invention has the advantages of simple and stable preparation process and promotion applicability; the obtained carbon nano tube is evenly dispersed on the surface of aluminium powder, and is well bonded with the interface of a substrate body; and the property of the aluminium base composite material is improved.

Description

technical field [0001] The invention relates to a method for preparing a uniformly dispersed carbon nanotube reinforced aluminum-based composite material, which belongs to the preparation technology of aluminum-based composite materials. Background technique [0002] Aluminum matrix composite material is a kind of light metal composite material. It not only maintains the advantages of good high temperature performance, high specific stiffness, and stable size that metal matrix composite materials generally have, but also partially inherits the low density, good thermal conductivity, and durability of pure aluminum. Strong corrosion and other advantages, it is the material of choice for the development of high-performance, lightweight structural parts; at the same time, the composite process of aluminum-based composite materials is relatively simple, the preparation method is flexible and diverse, the alloy selection range is wide, and the heat treatability is good. Therefore...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C47/14C22C49/06C22C101/10
Inventor 赵乃勤杨旭东师春生刘恩佐杜希文
Owner TIANJIN UNIV
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