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

A technology of carbon nanotubes and reinforced aluminum matrix, which is applied in the field of nano-reinforced metal matrix composite materials, can solve the problems of cumbersome preparation process, precise control of alloy temperature, high cost, etc., and achieve simple and stable preparation process, improved comprehensive mechanical properties, The effect of short preparation cycle

Active Publication Date: 2014-07-16
NANCHANG UNIV
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  • Abstract
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  • Claims
  • Application Information

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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 t

Method used

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

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] (1) Al powder and CNTs were mixed according to the mass fraction of CNTs at 8wt.%. First, the CNTs were ultrasonically dispersed in absolute ethanol. After ultrasonication for 30 min, Al powder was added to the mixed solution. Then, heat the above mixed solution while applying mechanical stirring, and put the powder into a drying box to dry after the absolute ethanol is evaporated to dryness. Then put the mixed powder into a mold and press it into a block, and then carry out hot pressing and sintering under the conditions of a temperature of 608° C. and a pressure of 30 MPa to obtain an Al-8CNTs master alloy.

[0018] (2) After the ZL301 alloy was heated to 750 °C and completely melted, the Al-8CNTs master alloy obtained in step (1) was added and the high-energy ultrasonic treatment was performed for 3 minutes at the same time, and the ultrasonic power was 400W. Remove the ultrasonic rod, adjust the melt temperature to 710°C, and cast into metal molds.

Embodiment 2

[0020] (1) Al powder and CNTs were mixed according to the mass fraction of CNTs at 11wt.%. First, the CNTs were ultrasonically dispersed in absolute ethanol. After ultrasonication for 40 min, Al powder was added to the mixed solution. Then, heat the above mixed solution while applying mechanical stirring, and put the powder into a drying box to dry after the absolute ethanol is evaporated to dryness. Then put the mixed powder into a mold and press it into a block, and then carry out hot pressing and sintering under the conditions of a temperature of 615° C. and a pressure of 50 MPa to obtain an Al-11CNTs master alloy.

[0021] (2) After the YL302 alloy was heated to 770 °C and completely melted, the Al-11CNTs master alloy obtained in step (1) was added and the high-energy ultrasonic treatment was performed for 5 minutes at the same time, and the ultrasonic power was 800W. Remove the ultrasonic rod, adjust the melt temperature to 710°C, and die-cast.

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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...

Claims

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Application Information

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IPC IPC(8): C22C1/10C22C21/00
Inventor 闫洪邱鸿旭
Owner NANCHANG UNIV
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