High conductivity carbon nanotube modified aluminum material and preparation method thereof

Abstract

The invention discloses a high-conductivity carbon nanotube modified aluminum material and a preparation method thereof. The preparation method comprises the following steps: carrying out vacuum ball milling on carbon nanotubes subjected to chemical surface modification or coating treatment and pure aluminum powder, mixing and stirring with a molten pure aluminum ingot, and carrying out cast forming to obtain the high-conductivity carbon nanotube modified aluminum material. The surface modification treatment on the carbon nanotubes increases the wettability between the carbon nanotubes and the molten aluminum, thereby implementing the uniform distribution of the carbon nanotubes in the molten aluminum, eliminating the density difference between the carbon nanotubes and the molten aluminum, reducing the floating phenomenon of the carbon nanotubes in the molten aluminum, increasing the wettability between the carbon nanotubes and the molten aluminum, and finally obtaining the composite material with higher conductivity than pure aluminum. The preparation method enhances the overall conductivity, is simple, and can implement large-scale industrial production.

Description

technical field [0001] The invention relates to a high-conductivity aluminum material, in particular to a high-conductivity carbon nanotube modified aluminum material and a preparation method thereof. Background technique [0002] Carbon nanotubes have excellent mechanical, optical, electrical, high temperature resistance, corrosion resistance, light weight and other excellent properties, which make them an ideal nano additive phase. As a reinforcing material, carbon nanotubes have been reported to improve the strength, hardness, friction, wear performance and thermal stability of metals. Their novel electrical properties have made carbon nanotubes more and more popular in the application of nanoelectronics. focus on. [0003] However, there are few reports on the use of high conductivity of carbon nanotubes to improve the overall conductivity of metal matrix composites. Aluminum and aluminum alloys have the characteristics of light weight, good rigidity, and small thermal...

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Problems solved by technology

[0004] For example, in the invention patent with the publication number CN101748349A, the extrusion casting method is introduced to prepare carbon nanotube reinforced aluminum alloy composite material, which solves the problem of carbon nanotube distribution in the carbon nanotube reinforced aluminum alloy composite material prepared by the existing method. Inhomogeneity, and the problem of poor bonding between carbon nanotubes and metal substrates

But it has some disadvantages: First, it pickles the carbon nanotubes and then disperses the carbon nanotubes in the aqueous solution with a surfactant. After drying, the prefabricated block is prepared by the pressure infiltration process to prepare the composite material. This process takes a long time. It is easy to produce a large amount of interface reactants and the dispersed carbon nanotubes will re-agglomerate during the process of volatilizing the solution during the preparation of the preform, which cannot effectively solve the problem of its dispersion in the aluminum liquid

In this patent, due to the simple mixing of carbon nanotubes and metal powder, the carbon nanotubes have not undergone pre-surface modification treatment. After the carbon nanotube / metal composite compact is added to the metal or alloy liquid, the carbon nanotubes The compatibility with molten metal is poor. After the composite compact is melted, the carbon nanotubes float up and cannot be uniformly dispersed in the metal matrix. The interface between the two is poor, which greatly deteriorates the performance of the composite material.

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