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Process for preparing carbon nano-tube-enhanced aluminum-based composite material

A technology of carbon nanotubes and composite materials, applied in the field of preparation of carbon nanotubes reinforced aluminum-based composite materials, which can solve the problems of short preparation time and achieve the effects of short preparation time and high resource utilization

Active Publication Date: 2011-01-26
KUNMING UNIV OF SCI & TECH
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  • Summary
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Grinding with a horizontal high-energy grinder with a rotation speed of 200-1000 rpm, one-step dry synthesis, eliminating the need for ultrasonic and drying processes for powder, short preparation time, and solving the problem of carbon nanotubes in aluminum matrix composites The problem of uniform dispersion in

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Weigh 1.0g of carbon nanotubes, 97.0g of aluminum powder with an average diameter of 30μm and 2.0g of absolute ethanol, mix the prepared raw materials and put them into a high-energy stirring grinder, wherein the ball-to-material ratio is 15:1, and the speed is 800 RPM, ball milling time is 40min, and then pressed into a compact of 30×10×6mm in the mold with a pressure of 500MPa, and the pressure is kept for 4min. The pressed compact is placed in a vacuum sintering furnace. -2 ~6×10 -2 Sintering at a temperature of 520±5° C. for 120 minutes in an environment of Pa to obtain a carbon nanotube-reinforced aluminum matrix composite material. The Brinell hardness of the material is 63.7HBs, and the density is 99.83%.

Embodiment 2

[0015] Weigh 7.0g of carbon nanotubes, 90.0g of aluminum powder with an average diameter of 10μm, and 3.0g of stearic acid and polyvinyl alcohol and mix them in a ratio of 1:1, and put the prepared raw materials into a high-energy stirring grinder. The ratio is 30:1, the rotating speed is 400 rpm, the ball milling time is 70min, and then pressed into a compact of 30×10×6mm in the mold with a pressure of 800MPa, the pressure is kept for 8min, and the pressed compact is placed in a vacuum In the sintering furnace, the vacuum degree is 10 -2 ~6×10 -2 In an environment of Pa, sintering at a temperature of 650±5° C. for 90 minutes to obtain a carbon nanotube-reinforced aluminum matrix composite material. The material has a Brinell hardness of 70.4HBs and a density of 99.65%.

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Abstract

The invention relates to a process for preparing a carbon nano-tube-enhanced aluminum-based composite material. The carbon nano-tube-enhanced aluminum-based composite material consists of the following raw materials in percentage by mass: 0.1 to 10 percent of carbon nano-tubes, 89 to 98.9 percent of aluminum powder and 1 to 5 percent of auxiliaries, is prepared by a process flow comprising ball-milling into powder, press-forming and vacuum sintering, and has the performance of strong strength, high density and the like. In the process, grinding is performed by adopting a horizontal high-energy grinding machine at the rotating speed of 200 to 1,000 revolutions per minute, and the composite material is synthesized in one step by a dry method, so the processes of performing ultrasonic treatment and drying on the powder are saved, preparation time is short, and problems on the uniform dispersion of the carbon nano-tubes in the aluminum-based composite material are solved.

Description

technical field [0001] The invention relates to a process for preparing carbon nanotube reinforced aluminum-based composite materials, which belongs to the technical field of metallurgical material preparation. Background technique [0002] Carbon nanotubes are seamless nanotube materials formed by curling single-layer or multi-layer carbon hexagonal planes. It not only has the characteristics of low density and good stability, but also has excellent mechanical properties (high elastic modulus, Tensile strength), wear resistance and self-lubricating properties, it is an ideal reinforcement, and because the volume of carbon nanotubes is much smaller than that of conventional carbon fibers, it will not destroy the continuity of the matrix when used as a metal-based reinforcement , which have laid a good foundation for the preparation of high-performance composite materials. In the field of metal matrix composite materials, aluminum matrix composite materials are widely used i...

Claims

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Application Information

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IPC IPC(8): C22C49/06C22C49/14C22C47/14C22C21/00C22C1/05C22C101/10
Inventor 蔡晓兰王晓飞张代明
Owner KUNMING UNIV OF SCI & TECH
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