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High thermal conductivity diamond particle hybrid reinforced graphite-aluminum composite material and its preparation process

A diamond particle and aluminum composite material technology is applied in the field of high thermal conductivity diamond particle hybrid reinforced graphite-aluminum composite material and its preparation process, which can solve the problems of reduced interface reaction, low density, insufficient thermal conductivity, etc. Mechanical properties, high mechanical properties, effect of inhibiting graphitization transformation

Active Publication Date: 2015-09-09
SHANGHAI JIAO TONG UNIV
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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 that the existing graphite-aluminum composite material is not high in density and the interface reaction reduces the thermal conductivity and does not fully exert its performance, so as to obtain a high-thermal conductivity diamond particle hybrid reinforced graphite-aluminum composite material with excellent comprehensive performance and its preparation process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The volume fraction of diamond particles in the graphite-aluminum composite material reinforced by diamond particles is 31%, the volume fraction of flake graphite is 48%, and the rest is high-purity aluminum. Its preparation steps are: (1) Carry out mechanical stirring in the mixer with diamond particles and flake graphite according to mass ratio 1: 1, until mixing evenly, wherein the diameter of diamond particle is 10 microns, and the diameter of flake graphite is 500 Micron; (2) add 3wt.% polyvinyl alcohol solution (PVA) in mixed powder, stir again 1 hour, then put mixed powder into mold and press into prefabricated block; (3) prefabricated block is heated in mould. 500°C and keep it warm for 1h, then carry out glue removal; (4) heat and melt the aluminum or aluminum alloy to 800°C in the crucible, and pour the aluminum or aluminum alloy melt into the mold; (5) Apply an axial pressure of 60MPa by a hydraulic press, Force the aluminum or aluminum alloy melt to infiltra...

Embodiment 2

[0023] The volume fraction of diamond particles in the diamond particle hybrid reinforced graphite aluminum composite material is 21%, the volume fraction of flake graphite is 65%, and the rest is aluminum alloy AlSi 7 Mg 0.3 . Its preparation steps are: (1) Carry out mechanical stirring in the mixer with diamond particle and flake graphite according to mass ratio 1: 2, until mixing evenly, wherein the diameter of diamond particle is 20 microns, the diameter of flake graphite is 200 Micron; (2) add 3wt.% polyvinyl alcohol solution (PVA) in mixed powder, stir again 1 hour, then put mixed powder into mold and press into prefabricated block; (3) prefabricated block is heated in mould. 500°C and keep it warm for 1h, then deglue; (4) Heat and melt the aluminum or aluminum alloy to 760°C in the crucible, and pour the aluminum or aluminum alloy melt into the mold; (5) Apply an axial pressure of 80MPa by a hydraulic press, Force the aluminum or aluminum alloy melt to infiltrate into...

Embodiment 3

[0025] The volume fraction of diamond particles in the diamond particle hybrid reinforced graphite aluminum composite material is 41%, the volume fraction of flake graphite is 32%, and the rest is aluminum alloy AlSi 12 . Its preparation steps are: (1) Carry out mechanical stirring in the mixer with diamond particles and flake graphite according to mass ratio 2: 1, until mixing evenly, wherein the diameter of diamond particle is 50 microns, the diameter of flake graphite is 400 Micron; (2) add 3wt.% polyvinyl alcohol solution (PVA) in mixed powder, stir again 1 hour, then put mixed powder into mold and press into prefabricated block; (3) prefabricated block is heated in mould. 500°C and keep it warm for 1h, then carry out glue removal; (4) heat and melt the aluminum or aluminum alloy to 780°C in the crucible, and pour the aluminum or aluminum alloy melt into the mold; (5) Apply an axial pressure of 50MPa by a hydraulic press, Force the aluminum or aluminum alloy melt to infil...

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Abstract

The invention relates to a high-thermal-conductivity graphite-aluminium composite material reinforced by diamond particles in a hybrid manner and a preparation process for the same. The composite material is composed of, in volume fraction, 21-41% of diamond, 32-65% of flake graphite, and the balance of aluminium or aluminium alloy. The preparation process comprises the following steps of: (1) uniformly mixing diamond particles and flake graphite to obtain mixed powder; (2) adding a polyvinyl alcohol (PVA) solution in the mixed powder and stirring, and pressing to obtain a precast block; (3) preheating and gluing the precast block in a die; (4) heating and melting aluminium or aluminium alloy in a crucible to 700-900 DEG C, then pouring an aluminium melt or aluminium alloy melt in the die; (5) applying an axial pressure by a hydraulic machine, and enabling the aluminium melt or aluminium alloy melt to infiltrate in pores in the precast block; and (6) cooling and releasing the die, and taking out the composite material. Compared with the prior art, the composite material obtained by the preparation process disclosed by the invention has a high thermal conductivity and obtains a high mechanical property simultaneously.

Description

technical field [0001] The invention belongs to the field of composite materials, and in particular relates to a high-thermal-conductivity diamond particle hybrid reinforced graphite-aluminum composite material and a preparation process thereof. Background technique [0002] With the continuous increase of thermal power density of electronic equipment, the thermal management of power devices puts forward new requirements for heat dissipation materials. For high power devices, traditional heat sink materials are no longer sufficient. In recent years, graphite-aluminum matrix composites have been developed with the characteristics of high thermal conductivity, low expansion, and low density, and have shown great advantages in high-performance thermal management materials. [0003] Due to its high thermal conductivity and low price, flake graphite has become an ideal raw material for the preparation of high thermal conductivity composite materials. Powder metallurgy and liqui...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C26/00C22C21/00C22C1/10
Inventor 周聪陈哲王浩伟
Owner SHANGHAI JIAO TONG UNIV
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