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Preparation method of high thermal conductivity aluminum matrix composite

An aluminum-based composite material, high thermal conductivity technology, applied in the production field of functional materials, can solve the problems of little increase in thermal conductivity and poor effect, and achieve the effect of high molding precision and cost reduction

Inactive Publication Date: 2010-05-19
NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The aluminum matrix composites prepared by traditional solid-state process methods do not improve the thermal conductivity much, and the effect is not good, so this problem cannot be solved

Method used

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Examples

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Comparison scheme
Effect test

preparation example Construction

[0023] The invention is a method for preparing a high thermal conductivity aluminum-based composite material. The inventive idea of ​​the method is: use carbon nanotubes or carbon nanotubes filled with magnetic particles that are prepared in batches by catalytic chemical vapor deposition with an iron-containing catalyst in a nano-agglomeration bed. The component content of carbon nanotubes can be adjusted arbitrarily according to the application purpose, and the carbon nanotubes are dispersed in the aluminum or aluminum alloy powder through solvent, ultrasonic and high-speed mixing treatment. Then disperse the carbon nanotubes, evenly distribute them on the powder of aluminum or aluminum alloy, put them into the mold, adopt permanent magnet or electromagnetic orientation, and press to form. Sinter the finished product in vacuum or protective atmosphere.

[0024] The preparation method of the high thermal conductivity aluminum-based composite material of the present invention a...

Embodiment 1

[0032] Take 3% carbon nanotubes prepared in batches by iron-containing catalyst catalytic chemical vapor deposition in the Tsinghua nano agglomeration bed according to the weight percentage, add 95% ethanol and 1.25% surface dispersant alkylphenol to the carbon nanotubes Polyoxyethylene ether (OP) was treated with ultrasonic wave for 60 minutes to obtain carbon nano-liquid. After drying the obtained carbon nano-liquid with a dryer, add 6061 aluminum alloy powder under a 200 mesh sieve to the carbon nano-liquid, put the mixture of carbon nano-liquid and 6061 aluminum alloy powder into a ball mill and mill for 30 minutes , the ball-milled mixture is then put into a mixer, and mechanically stirred at a high speed for 10 minutes to obtain a powder. Lightly press the powder into the mold, adopt the magnetic orientation method, the magnetic field strength is 300mT, keep it for 20 minutes, press molding, the pressure is 300 MPa, and the semi-finished product is obtained. The semi-fi...

Embodiment 2

[0034] According to the weight percentage, 4% carbon nanotubes prepared in batches by iron-containing catalyst catalytic chemical vapor deposition in the Tsinghua nano agglomeration bed were taken, and 95% volume percentage of ethanol and 1.25% surface dispersant alkylphenol polymer were added to the carbon nanotubes. Oxyethylene ether (OP) was treated with ultrasonic waves for 60 minutes to obtain carbon nano-liquid. After drying the obtained carbon nano-liquid with a dryer, add 6061 aluminum alloy powder under a 200 mesh sieve to the carbon nano-liquid, put the mixture of the carbon nano-liquid and the 6061 aluminum alloy powder into a ball mill and mill for 30 minutes, The ball-milled mixture was then placed in a mixer, and mechanically stirred at high speed for 10 minutes to obtain a powder. Lightly press the powder into the mold, adopt the magnetic force orientation method, the magnetic field strength is (400) mT, keep for 20 minutes, press molding, and the pressure is ke...

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Abstract

The invention discloses a preparation method of a high thermal conductivity aluminum matrix composite. The preparation method comprises the following steps of: adopting carbon nano tubes and aluminum alloy powder as ground mass, taking the carbon nano tube in percentage by weight; adding alcohol and surface dispersant to the carbon nano tubes, and treating by ultrasonic wave to obtain carbon nano liquid; baking the carbon nano liquid, then adding the aluminum alloy powder for ball-milling, stirring at high speed in a stirrer, and dispersing and uniformly distributing the carbon nano tubes in the aluminum alloy powder body to obtain a powdery material; slightly pressing the powdery material in a mould, and adopting a magnetic orientation method for compression molding forming to obtain a semi-finished product; low-temperature sintering the semi-finished product, high-temperature sintering the semi-finished product, wherein inert gas is adopted for protection during sintering; and reducing the temperature of the inside of the furnace to room temperature to obtain a finished product. The magnetic orientation method not only is simple but also enables the aluminum matrix composite or the aluminum alloy matrix composite to internally acquire oriented carbon nano tubes, and induces the carbon nano tubes to distribute axially as much as possible. The invention can highlight the extremely unique and anisotropic micro structural characteristic of the carbon nano tubes.

Description

technical field [0001] The invention relates to a method for preparing functional materials, in particular to a method for preparing aluminum-based composite materials with high thermal conductivity by using magnetically oriented carbon nanotubes. Background technique [0002] With the continuous development of modern industry, various reinforced aluminum matrix composites are increasing. It is precisely because of the addition of reinforcements and the good compounding with the matrix that aluminum matrix composites have various properties that are superior to ordinary aluminum alloys. , so the choice of enhancer is very important. For the specific application of different materials, reinforcements with different properties should be selected. Due to the excellent thermal conductivity of carbon nanotubes, the thermal conductivity of single-walled carbon nanotubes at room temperature is 6000W / (m-K), which is similar to diamond. The thermal conductivity of double-walled car...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C47/00C22C49/06C22C101/10
Inventor 侯国宪韩雪王岭娥黄雄陈伟
Owner NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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