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Preparing method of high-thermal-conductivity graphite/aluminum composite

An aluminum composite material, high thermal conductivity graphite technology, applied in metal processing equipment, coating, transportation and packaging, etc., can solve the problems of low thermal conductivity, low thermal conductivity, etc., to reduce thermal expansion coefficient, simple preparation process, overcome the Insufficient effect of wettability

Inactive Publication Date: 2017-07-04
GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of low thermal conductivity of existing graphite / aluminum composite materials, provide a method for preparing graphite / aluminum composite materials, and obtain new materials with light weight, high thermal conductivity and low expansion

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Raw materials: high thermal conductivity flake graphite powder particle size -32 mesh, aluminum powder particle size -200 mesh, graphite volume fraction 50%.

[0026] Mix aluminum powder and ethanol 1:1 (volume ratio) to form a slurry, then roll it on a two-roll mill with a rolling pressure of 50Mpa and a rolling speed of 40r / min, cool, wash and dry.

[0027] The above-mentioned high thermal conductivity flake graphite powder is vacuum micro-evaporated and titanium-coated to 0.5 μm, and then mixed with flake-like pure aluminum powder at a volume ratio of 50:50 to obtain a composite powder. Put the uniformly mixed graphite / aluminum powder into the graphite mold, heat it up to the sintering temperature of 560°C at a heating rate of 100°C / min, and apply a pressure of 40MPa during the heating process, and keep it under pressure for 20 minutes after reaching the sintering temperature. After cooling with the mold, the graphite / aluminum composite material with high thermal con...

Embodiment 2

[0029] Raw materials: high thermal conductivity flake graphite powder particle size is -50 mesh, aluminum powder particle size is -200 mesh, graphite volume fraction is 30%.

[0030] Mix aluminum powder and ethanol 1:2 (volume ratio) to form a slurry, then roll it on a two-roll mill with a rolling pressure of 70Mpa and a rolling speed of 50r / min, cool, wash and dry.

[0031] The above-mentioned high thermal conductivity flake graphite powder is vacuum micro-evaporated and titanium-coated to 0.5 μm, and then mixed with flake-like pure aluminum powder at a volume ratio of 30:70 to obtain a composite powder. Put the uniformly mixed graphite / aluminum powder into the graphite mold, heat it up to the sintering temperature of 560°C at a heating rate of 100°C / min, and apply a pressure of 40MPa during the heating process, and keep it under pressure for 20 minutes after reaching the sintering temperature. After cooling with the mold, the graphite / aluminum composite material with high th...

Embodiment 3

[0033] Raw materials: high thermal conductivity flake graphite powder particle size -50 mesh, aluminum powder particle size -200 mesh, graphite volume fraction 10%.

[0034] Mix aluminum powder and ethanol 2:1 (volume ratio) to form a slurry, then roll it on a two-roll mill with a rolling pressure of 60Mpa and a rolling speed of 60r / min, cool, wash and dry.

[0035] The above-mentioned high thermal conductivity flake graphite powder is vacuum micro-evaporated and titanium-coated to 0.5 μm, and then mixed with flake-like pure aluminum powder at a volume ratio of 10:90 to obtain a composite powder. Put the uniformly mixed graphite / aluminum powder into the graphite mold, heat it up to the sintering temperature of 560°C at a heating rate of 100°C / min, and apply a pressure of 40MPa during the heating process, and keep it under pressure for 20 minutes after reaching the sintering temperature. After cooling with the mold, the graphite / aluminum composite material with high thermal con...

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Abstract

The invention relates to a preparing method of a high-thermal-conductivity graphite / aluminum composite and belongs to the technical fields of high-thermal-conductivity electronic packaging material preparing technologies and heat management materials. The method comprises the following steps: plating graphite powder with titanium; rolling aluminum and / or aluminum alloy powder into a flake; carrying out ball milling and mixing on the titanium-plated graphite powder and the flaky aluminum and / or aluminum alloy powder according to a ratio so as to obtain composite powder; then, filling a graphite die with the uniformly mixed graphite / aluminum powder, and adopting powder metallurgy hot-pressing; and after cooling the composite powder with the die, carrying out demoulding to obtain the high-thermal-conductivity graphite / aluminum composite. The method solves the problem that the thermal conductivity of the existing graphite / aluminum composite is low, improves the thermal conductivity of the graphite / aluminum composite, and is simple in technology, high in efficiency and low in cost.

Description

technical field [0001] The invention relates to a method for preparing a high thermal conductivity graphite / aluminum composite material. The graphite / aluminum composite material prepared by the method is light in weight, high in thermal conductivity and low in thermal expansion coefficient, and belongs to the preparation technology of high thermal conductivity electronic packaging materials and the technology of thermal management materials field. Background technique [0002] With the development of microelectronic devices, in order to further improve the thermal conductivity of metal matrix composites, carbon has been widely studied as a reinforcement. Such as graphite, carbon nanotubes, carbon fibers and diamonds, etc., but the dispersion and alignment of carbon nanotubes in the metal matrix has always been a technical difficulty that prevents large-scale application. The difficult and expensive preparation of carbon fiber aluminum prevents it from being popularized. Diam...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/05C22C1/10C22C21/00B22F1/02
CPCC22C1/05C22C21/00B22F1/17
Inventor 郭宏张习敏范叶明韩媛媛刘依卓子
Owner GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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