Method for preparing carbon nano tube reinforced aluminium matrix composite by utilizing ultrasound

Abstract

The invention relates to a method for preparing a carbon nano tube reinforced aluminium matrix composite by utilizing ultrasound. The method for preparing the carbon nano tube reinforced aluminium matrix composite by utilizing the ultrasound comprises the following steps: firstly ultrasonically dispersing carbon nano tubes in an absolute ethyl alcohol solution, adding aluminium powder into the absolute ethyl alcohol solution dispersed with the carbon nano tubes in ratio by mass fraction of the carbon nano tubes in an aluminium-carbon nano tube intermediate alloy being 8-10wt%, then heating while mechanical stirring is carried out, distilling absolute ethyl alcohol, drying powder in a drying oven, then placing the obtained mixed powder into a mould, briquetting, and then carrying out hot pressed sintering, so that the aluminium-carbon nano tube intermediate alloy is obtained; heating until an aluminium alloy is completely molten, adding the aluminum-carbon nano tube intermediate alloy, and applying the ultrasound, so that a carbon nano tube reinforcement phase is uniformly dispersed, removing an ultrasound rod after ultrasonic treatment is finished, adjusting temperature of a melt to a casting temperature, and casting, so that a casting is obtained. The method for preparing the carbon nano tube reinforced aluminium matrix composite by utilizing the ultrasound has the advantages that a technology is simple and stable, energy is saved, a preparation period is short, and energy consumption is low; interface bonding between the carbon nano tubes and an alloy matrix is good, and comprehensive mechanical properties of the prepared aluminium matrix composite are obtained.

Description

technical field [0001] The invention belongs to the field of metal material preparation, and relates to a method for preparing a nano-reinforced metal matrix composite material. Background technique [0002] In recent years, with the rapid development of high-tech fields such as aerospace, automobile, machinery and electronics industries, the demand for nano-reinforced metal matrix composites is increasing year by year. Aluminum matrix composites have a wide range of sources, good processing performance, high specific strength and specific modulus, and are highly valued. The use of carbon nanotubes (CNTs) to prepare aluminum matrix composites has the advantages of less addition and large performance improvement. As a reinforcement, carbon nanotubes have important application value and immeasurable application value for improving the mechanical properties and thermal conductivity of composite materials. development prospects. However, the wettability of carbon nanotubes and...

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Problems solved by technology

This method has the following defects: (1) The obtained composite material has inherent defects of the powder metallurgy method, such as pores, low density, etc., and secondary processing (hot extrusion) is required to increase the density of the material and reduce defects; ( 2) The preparation process is cumbersome, and the cost of equipment and raw materials is high; (3) The carbon nanotubes are subjected to strong external forces such as extrusion and shear during the ball milling process, and the length of the carbon nanotubes is shortened and severely damaged; (4) The shape of the product is limited

The disadvantage of this method is that the electroless nickel plating process is complex and cumbersome, and the cost is high; and the semi-solid temperature range of the aluminum alloy melt is narrow, the alloy temperature needs to be precisely controlled, and the stirring needs to be carried out under the protection of an inert gas.

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