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A kind of directional high thermal conductivity low expansion graphite aluminum composite material and its preparation method

An aluminum composite material, low expansion technology, applied in the field of metal-based graphite composite material and its preparation, can solve the problems of poor orientation of graphite flakes, inclusion density, etc., and achieve the effects of low cost, increased density, and simple equipment

Active Publication Date: 2016-01-20
HARBIN INST OF TECH
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to solve the problems of poor alignment, inclusion and low density of existing graphite-aluminum composite material graphite flakes, and provide high directional thermal conductivity, high density, no impurities, low expansion, aluminum liquid impregnated into graphite flakes Graphite-aluminum composite material inside the structure and its preparation method

Method used

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  • A kind of directional high thermal conductivity low expansion graphite aluminum composite material and its preparation method
  • A kind of directional high thermal conductivity low expansion graphite aluminum composite material and its preparation method
  • A kind of directional high thermal conductivity low expansion graphite aluminum composite material and its preparation method

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specific Embodiment approach 1

[0020] Specific implementation mode 1: In this embodiment, the oriented high thermal conductivity and low expansion graphite aluminum composite material is made of oriented arranged flake graphite and aluminum metal, the aluminum metal is pure aluminum or aluminum alloy, and the oriented high thermal conductivity low expansion graphite aluminum composite material is made of flakes The graphite content is 30-70vol.%, and the directional arrangement of flake graphite is formed by impact vibration.

specific Embodiment approach 2

[0021] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that the aluminum metal component is pure Al, or 1~25wt.% Si is added to Al, or 1~53wt.% Cu is added, or 1~53wt.% Cu is added. 38wt.% of Mg, one or a combination of several components. Other parameters are the same as in the first embodiment.

specific Embodiment approach 3

[0022] Specific embodiment three: this embodiment is different from specific embodiment one or two in that the aluminum alloy is Al-Si alloy, Al-Cu alloy, Al-Mg alloy, Al-Si-Cu alloy, Al-Si-Mg alloy, One or a combination of Al-Cu-Mg alloys and Al-Si-Cu-Mg alloys, wherein Al-Si alloys are 1~25wt.% Si added to Al, and Al-Cu alloys are 1~53wt.% Cu is added to Al, and 1~38wt.% Mg is added to Al for Al-Mg alloy. Other parameters are the same as those in Embodiment 1 or Embodiment 2.

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Abstract

The invention relates to a metal-matrix graphite composite and a preparation method thereof, in particular to a directional high-thermal-conductivity low-expansion aluminum-graphite composite and a preparation method thereof so as to solve the problems of poor orientation arrangement of graphite flakes, low density and inclusion containing of an existing aluminum-graphite composite. Aluminum-graphite is made of graphite flakes and aluminum, and the graphite flakes are 30-70vol.% in content in the composite and are arranged regularly and directionally. The preparation method includes the steps: firstly, loading the graphite flakes into a mould, and applying impact vibration to enable the graphite flakes to be arranged regularly and directionally so that a precast block is formed; secondly, preheating the steel mould, and heating the aluminum to be molten; thirdly, disposing the mould on a platform of a press, pouring the molten aluminum into the mould, and applying pressure through a punch; fourthly, maintaining pressure and cooling; and fifthly, demoulding. The aluminum-graphite composite is more than 99% in density, high in directional thermal conductivity and free of inclusions. The composite and the method are mainly applied to high-power-density and high-heat-flux-density electronic and micro-electronic devices.

Description

technical field [0001] The invention relates to a metal-based graphite composite material and a preparation method thereof. Background technique [0002] With the development of high-performance and miniaturized electronic equipment, resulting in increased power density and heat flux, the thermal management of power devices is becoming more and more important. The technical bottleneck in the design field creates an urgent need for new high-performance thermal management materials. As an ideal thermal management material, the new composite material of flake graphite aluminum has light weight, low and tailorable thermal expansion coefficient, high thermal conductivity, low manufacturing cost and suitable machining performance, showing great potential in the field of thermal management. Technical advantages. [0003] From 2001 to 2010, the demand for metal matrix composites in the field of thermal management rose from 886 tons to 1562 tons, which still cannot meet the demand. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/10C22C21/00
Inventor 武高辉李文君陈国钦姜龙涛张强康鹏超苟华松
Owner HARBIN INST OF TECH
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