A method of preparing a high-conductivity aluminum-based composite material by utilizing low-resistivity carbon nanotubes

Abstract

The invention provides a method for preparing a high-conductivity aluminum-based composite material by utilizing low-resistivity carbon nanotubes. The steps are: take the original carbon nanotubes for pretreatment process; then coat the surface with a layer of material that can effectively block the aggregation of carbon nanotubes and improve the wettability of carbon nanotubes and aluminum liquid to obtain a composite powder; The powder is added to the molten aluminum for vacuum melting, so that the carbon nanotubes can be evenly distributed in the aluminum matrix, and the target product can be obtained after casting. The method of the invention can reduce the bulk resistivity of the original high-resistivity carbon nanotubes, increase the wetting performance between the carbon nanotubes and the aluminum liquid, improve the dispersion performance of the carbon nanotubes in the aluminum matrix, and improve the performance of the aluminum matrix. Conductivity of composite materials.

Description

technical field [0001] The invention relates to the technical field of aluminum-based composite materials, in particular to a preparation method for preparing high-conductivity aluminum-based composite materials by using low-resistivity carbon nanotubes. 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. So far, there have been a lot of reports about carbon nanotube aluminum matrix composites, but the problem is that most of these reports focus on carbon nanotube-reinforced aluminum matrix, making full use of the excellent mechanical properties of carbon nanotubes, However, there is little use of carbon nanotubes to improve the electrical conductivity of the aluminum matrix, ignoring the fact that carbon nanotubes themselves have good electrical conductivity. [0003] For example, in the inv...

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Problems solved by technology

Although the carbon nanotubes are pre-dispersed in this method, the carbon nanotubes and the aluminum alloy are only adhesively combined and have extremely low adhesion strength, and the drying treatment process causes the dispersed carbon nanotubes to be in a dry environment. The medium will be reunited, which leads to the agglomeration of the carbon nanotubes in the aluminum melt after the master alloy is added to the aluminum melt, and the carbon nanotubes and the aluminum alloy are peeled off, resulting in poor wettability between the carbon nanotubes and the aluminum solution , the prepared carbon nanotube-reinforced aluminum matrix composites are naturally not high in conductivity

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