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High-thermal-conductivity graphite-metal composite material and preparation method thereof

A technology of metal composite materials and high thermal conductivity graphite, which is applied in the field of thermal conductivity materials, can solve the problems of inability to meet the heat dissipation performance requirements of electronic components for heat sink materials, low thermal conductivity, low strength, etc.

Active Publication Date: 2020-10-23
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, silicon carbide-aluminum matrix composite materials have high strength, but low thermal conductivity, only 150W / m·K~300W / m·K, which cannot meet the heat dissipation performance requirements of electronic components for heat sink materials
Although the thermal conductivity of diamond-aluminum composites can reach 450W / m·K~560W / m·K, the use of ultra-high hardness diamond with a high mass fraction makes the composite materials difficult to process and does not have large-scale commercial application value
Although graphite has the advantages of high thermal conductivity, low thermal expansion coefficient, and light weight, due to the brittle characteristics of graphite, its low strength is difficult to meet the processing requirements of devices, which limits its industrial application.

Method used

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  • High-thermal-conductivity graphite-metal composite material and preparation method thereof
  • High-thermal-conductivity graphite-metal composite material and preparation method thereof
  • High-thermal-conductivity graphite-metal composite material and preparation method thereof

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preparation example Construction

[0027] The invention provides a method for preparing a high thermal conductivity graphite-metal composite material, comprising:

[0028] S1, providing a substrate, on which a sub-prefabricated block is arranged, the sub-prefabricated block includes a first graphite layer, a metal layer and a second aluminum layer stacked on the substrate, the substrate is the first aluminum layer, the metal layer is provided with through holes, the melting point of the alloy formed by the metal atoms and aluminum atoms in the metal layer is not higher than the melting point of aluminum, and the prefabricated block is obtained;

[0029] S2, hot pressing and sintering the prefabricated block at 500°C to 750°C, so that the first aluminum layer and the second aluminum layer are melted to form aluminum liquid, and the aluminum liquid passes through the through hole Combining with at least part of the metal atoms in the metal layer to form an alloy liquid, and the aluminum liquid and the alloy liqui...

Embodiment 1

[0057] Take flake graphite powder with a particle size of 500 μm, sodium chloride and a small amount of silicon powder and mix evenly to make a mixed powder. Calculated by the total weight of the mixed powder, sodium chloride accounts for 75 wt%, and silicon powder accounts for 5 wt%. Put the mixed powder into a vacuum carbon tube furnace, evacuate to a vacuum degree of about 10Pa to 220Pa, heat up at a rate of 15°C / min, raise the temperature to 1100°C, keep it for 60min, and then cool down to room temperature with the furnace. Take out the high-temperature-treated mixed powder, put it into a beaker filled with deionized water, put the beaker filled with the treated mixed powder and deionized water into a drying oven, set the temperature at 85°C, keep it warm for 30 minutes, take out the beaker and dry it. Pour off the aqueous solution of sodium chloride, re-pour deionized water and repeat the above operations, wash the mixed powder 5 times, pass the washed and dried mixed powd...

Embodiment 2

[0060] Forming the graphite composite in Example 1 on the first aluminum foil to form a sub-prefabricated block, including sequentially forming the first graphite layer, the copper mesh and the second aluminum foil on the first aluminum foil. The thicknesses of the first aluminum foil and the second aluminum foil are both 20 μm, the thickness of the first graphite layer is 2 mm, the copper mesh is 50 mesh, and the thickness is 0.05 mm. Stack multiple sub-prefabricated blocks along the axial direction into a high-precision mold to form a prefabricated block. In the prefabricated block, the mass fraction of the graphite layer is 55%, the mass fraction of the aluminum foil is 30%, and the mass fraction of the copper mesh is 15%. %. In a vacuum one-way hot-pressing sintering furnace, heat up to 630°C at a heating rate of 10°C / min for sintering, the sintering pressure is 60MPa, and the holding time is 120min. Then cool down to room temperature with the furnace to obtain a high the...

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Abstract

The invention relates to a high-thermal-conductivity graphite-metal composite material and a preparation method thereof. The preparation method comprises the steps that a substrate is provided, and asub-prefabricated block is arranged on the substrate, specifically, the sub-prefabricated block comprises a first graphite layer, a metal layer and a second aluminum layer which are laminated on the substrate, the substrate is a first aluminum layer, through holes are formed in the metal layer in a penetrating mode, the melting point of the metal layer is higher than the melting point of aluminum,the melting point of an alloy formed by metal atoms in the metal layer and aluminum atoms is not higher than the melting point of the aluminum, and a prefabricated block is obtained; and the prefabricated block is subjected to hot-pressing sintering under the temperature of 500-750 DEG C to melt the first aluminum layer and the second aluminum layer to form aluminum liquid, the aluminum liquid passes through the through holes to be combined with at least part of the metal atoms in the metal layer to form alloy liquid, and the aluminum liquid and the alloy liquid are injected into gaps among graphite in the first graphite layer to form a metal framework, so that the high-thermal-conductivity graphite-metal composite material is obtained. The high-thermal-conductivity graphite-metal composite material comprises graphite belt layers and a composite layer, the strength and the thermal conductivity are high, and the thermal expansion coefficient is controllable.

Description

technical field [0001] The invention relates to the technical field of thermally conductive materials, in particular to a high thermally conductive graphite-metal composite material and a preparation method thereof. Background technique [0002] With the rapid development of the electronics industry, the unit heat density of power devices is getting higher and higher, so the heat dissipation effect of heat-conducting materials is particularly important. [0003] Among traditional heat-conducting materials, metal heat-conducting materials such as copper and aluminum have properties such as easy processing and high heat conductivity, and are widely used in various industries. However, the thermal expansion coefficient of the metal heat-conducting material is relatively high (17×10 -6 ~23×10 -6 / K), making it difficult to match the thermal expansion coefficient of the electronic chip. In order to reduce the thermal expansion coefficient of metal heat-conducting materials, se...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F7/02B22F3/14C22C1/10C22C1/04
CPCB22F7/02B22F3/14C22C1/10
Inventor 薛晨张琼马洪兵曾凡坤何强江南
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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