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Preparation method of carbon nanotube reinforced Al-matrix composite

A carbon nanotube and aluminum-based technology is applied in the field of preparation of aluminum-based composite materials, which can solve the problems of easy agglomeration and deactivation of catalysts, shortened carbon nanotube lengths, and large specific surface area of ​​substrates, and meets the requirements of substrate morphology. Not high, reducing the oxidation of the matrix, the effect of mild reaction

Inactive Publication Date: 2012-09-19
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of this process is that the carbon nanotubes should be treated with acid in the early stage, so that the length of the carbon nanotubes will be shortened, the amorphous carbon will increase, and the impurity content will also increase.
The disadvantage of this method is that the impregnation process requires a large specific surface area of ​​the substrate, and the catalyst is easy to agglomerate and deactivate.
[0006] Due to the above problems, so far there are few reports on the successful introduction of CNTs reinforcement phase into aluminum matrix composites.

Method used

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  • Preparation method of carbon nanotube reinforced Al-matrix composite
  • Preparation method of carbon nanotube reinforced Al-matrix composite
  • Preparation method of carbon nanotube reinforced Al-matrix composite

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Take 0.500g of polyvinyl alcohol, add it into 200ml of deionized water, heat and dissolve to obtain a polyvinyl alcohol solution, and perform ultrasonication at room temperature for 10 minutes. Then add 20 g of laminar aluminum powder into the polyvinyl alcohol solution, stir magnetically at room temperature for 2 hours, filter and dry to obtain lamellar aluminum powder coated with polyvinyl alcohol. Dissolve 2.488g of nickel acetate tetrahydrate in 200ml of deionized water to prepare a 0.05mol / L nickel salt solution, add the above powder into the solution and stir magnetically at room temperature for 2 hours, filter and evaporate to dryness, and place in an oven to dry at 80°C Afterwards, the precursor powder is obtained. Take a certain amount of catalyst precursor powder and place it in the constant temperature zone of the tube furnace. Under the protection of argon, the temperature is raised to 250°C at a heating rate of 10°C / min, and the temperature is raised at a h...

Embodiment 2

[0028] Concrete method and step are the same as embodiment 1, and different conditions are: change raw material 2.488g nickel acetate tetrahydrate into 2.491g cobalt acetate tetrahydrate, feed the mixed gas of acetylene and argon during catalytic cracking, wherein the flow rate of acetylene is 20ml / min , the argon flow rate was 260ml / min, and finally a carbon nanotube and aluminum composite material with a carbon nanotube content of 4.12wt.% was obtained.

Embodiment 3

[0030] The specific method and steps are the same as in Example 1, except that the different conditions are: hydrogen gas instead of argon gas is introduced during the 1 hour heat preservation at 250°C, and finally a carbon nanotube and aluminum composite with a carbon nanotube content of 3.90wt.% is obtained. Material.

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Abstract

The invention discloses a preparation method of a carbon nanotube reinforced Al-matrix composite. The method comprises the following processes of: coating lamellar aluminum powder by using polyvinyl alcohol or a mixture of polyethylene glycol and citric acid; adhering the lamellar aluminum powder for coating a polymer to catalyst precursor particles dissolved in a solution; then, calcining, reducing, pyrolyzing a high polymer and carrying out catalytic cracking on a carbon source to grow a carbon nanotube; and finally, carrying out a powder metallurgy process to obtain the carbon nanotube reinforced Al-matrix composite. The preparation method has the advantages that a catalyst is uniform in dispersing, not easy to agglomerate, high in catalytic activity, simple in preparation, not high in matrix appearance requirement and high applicability; the process reaction is mild, the damage degree for a carbon nanotube structure is low, the yield of carbon nanotubes growing through catalysis is continuously adjusted, and the prepared composite has excellent performance.

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 (CNTs) were discovered by Japanese scientist Iijima in 1991, they have attracted widespread attention due to their unique structures and properties. Carbon nanotubes have a unique nano-hollow structure, closed topological configuration and helical structure, so they have a large number of special excellent properties, such as high strength, high elasticity, high specific surface area, heat resistance, corrosion resistance, excellent thermal conductivity and electrical conductivity It has great application prospects in many fields. [0003] The modulus of carbon nanotubes is the same as that of diamond, and the theoretical strength reaches 10 6 MPa is 100 times that of steel, and its density is only 1 / 6...

Claims

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Application Information

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IPC IPC(8): C22C1/05C22C21/00
Inventor 赵乃勤蔺冀川师春生刘恩佐何春年
Owner TIANJIN UNIV
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