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Lightweight high heat conductive composite material and preparation method thereof

A composite material and high thermal conductivity technology, applied in the direction of heat exchange materials, chemical instruments and methods, etc., can solve the problems of high cost, high density of metal materials, and easy corrosion, etc., and achieve good mechanical strength, low density, and thermal conductivity high effect

Inactive Publication Date: 2009-10-07
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, metal materials have high density, high cost, easy corrosion, large energy consumption and environmental pollution in the process of smelting and processing

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Selected natural flake graphite powder and Al powder are mixed according to the weight ratio of 75:25. The mixing is carried out in a stirrer with a rotating speed of 10000 rpm, and the mixing is carried out for 1 hour. The powder is hot-pressed under a vacuum pressure of 600 degrees and 30 MPa to obtain a light-weight and high-thermal-conductivity composite material. It is measured that its thermal conductivity along the direction of hot pressing is 7.9W / m·K, and its thermal conductivity along the direction of hot pressing is 290W / m·K.

Embodiment 2

[0021] The pyrolytic graphite powder and the Al powder are mixed in a weight ratio of 80:20. The mixing is carried out in a stirrer with a rotating speed of 10000 rpm, and the mixing is carried out for 1 hour. The powder is hot-pressed and molded under a vacuum pressure of 750 degrees and 20 MPa to obtain a light-weight and high-thermal-conductivity composite material. It is measured that its thermal conductivity along the direction of hot pressing is 8.5W / m·K, and its thermal conductivity along the direction of hot pressing is 320W / m·K.

Embodiment 3

[0023] The expanded graphite powder and the Al powder are mixed in a weight ratio of 90:10. The mixing is carried out in a stirrer with a rotating speed of 12000 rpm, and the mixing is stirred for 0.5 hours. The powder is hot-pressed under a vacuum pressure of 700 degrees and 500 MPa to obtain a lightweight and high-thermal-conductivity composite material. It is measured that its thermal conductivity along the hot pressing direction is 8.7W / m·K, and its thermal conductivity perpendicular to the hot pressing direction is 356W / m·K.

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Abstract

The lightweight high heat conductive composite material disclosed in the present invention comprises the following components in weight percentages of: graphite powder 71-99%, and Al powder 1-29%. The preparation method comprises the steps of: weighing the graphite powder and the Al powder according to the weight percentages; putting into an enclosed container, mixing, and standing for 0.5-24 hours; hot compacting with the pressure over 10 MPa, at temperature above 600 degrees centigrade, in vacuum or under protection of argon or nitrogen. The invention has the advantages of simple preparation process, one-shot forming, short production cycle, wide raw material source, and low cost; the obtained composite material finished product has low density, high mechanical strength, high thermal conductivity and no micro-crack inside material.

Description

technical field [0001] The invention relates to a high thermal conductivity composite material and a preparation method thereof. Background technique [0002] The function of electronic components is improving day by day, and it is also a source of heat. Excessive temperature rise is often a fatal factor leading to failure and failure of electronic systems. In order to make electronic systems and components work continuously and stably, effective and reliable heat dissipation is obviously very important. Therefore, it is imperative to research and develop high-efficiency electronic heat dissipation materials and related technologies. [0003] Metal is the preferred thermally conductive material. Gold and silver with high thermal conductivity cannot be widely used due to their high price; iron has low thermal conductivity. Although the thermal conductivity of copper is high, its density is high and the cost is high. Aluminum has a high thermal conductivity, low density, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/14
Inventor 程继鹏史丹安全福张孝彬
Owner ZHEJIANG UNIV
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