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High-thermal-conductivity composite material with embedded structure and preparation method for high-thermal-conductivity composite material

A high thermal conductivity, composite material technology, applied in the field of composite materials, can solve the problems of inability to use substrate materials, high cost of carbon nanotubes and highly oriented pyrolytic graphite, etc. Effect

Inactive Publication Date: 2022-01-21
河南瀚银光电科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, carbon nanotubes and highly oriented pyrolytic graphite are expensive and cannot be used alone as substrate materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] This embodiment provides a method for preparing a high thermal conductivity composite material with an embedded structure, including the following steps:

[0029] (1) Preparation of porous ceramics: pressing porous silicon carbide ceramic powder to obtain a green body; sintering the green body at 1700° C. under a nitrogen atmosphere (60% vol) and keeping it warm for 1 hour to form a porous ceramic;

[0030] (2) Importing ultra-high thermal conductivity materials: embedding nickel-plated diamond micropowder with an average particle size of 320 mesh into the porous ceramic core to obtain a preform;

[0031] (3) Metal smelting: select industrial pure aluminum, put it into a pit furnace for smelting at a temperature of 850°C, and obtain molten aluminum;

[0032] (4) Squeeze casting: put the prefabricated body into a vacuum box furnace for preheating, under argon protection, the preheating temperature is 800°C, and at the same time, the composite mold is preheated to 300°C. ...

Embodiment 2

[0035] This embodiment provides a method for preparing a high thermal conductivity composite material with an embedded structure, which is different from Embodiment 1 in that the embedded high thermal conductivity material is oriented pyrolytic graphite.

Embodiment 3

[0037] This example provides a method for preparing a high thermal conductivity composite material with an embedded structure. The difference from Example 1 is that the metal melting material is magnesium-aluminum alloy AZ81, the melting temperature is 700°C, about 75% air, about 24.8% CO 2 , about 0.2% SF 6 Mixed gas for protection.

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Abstract

The invention relates to a high-thermal-conductivity composite material with an embedded structure and a preparation method for the high-thermal-conductivity composite material. The high-thermal-conductivity composite material with the embedded structure is constructed by an ultrahigh thermal conductivity material and a porous ceramic metal composite material, wherein the ultrahigh thermal conductivity material is one of a diamond metal composite material, a graphene metal composite material, a carbon nanotube metal composite material, a boron nitride metal composite material and oriented pyrolytic graphite, and the transverse or longitudinal heat conductivity is greater than 300 W / m.K; and the porous ceramic metal composite material is formed by compounding porous ceramic and metal, the porous ceramic is one of SiC, AlN, BN, Si3N4, Al2O3, TiC, TiB2 or B4C, and the metal is one of pure copper, copper alloy, pure aluminum, aluminum alloy, pure magnesium or magnesium alloy. According to the high-thermal-conductivity composite material with the embedded structure and the preparation method for the high-thermal-conductivity composite material, the test shows that the thermal conductivity range is 200-1500 W / m.k, the material preparation cost can be effectively reduced, and rapid preparation of high-performance thermal management materials is realized.

Description

technical field [0001] The invention belongs to the field of composite materials, and in particular relates to a high thermal conductivity composite material with an embedded structure and a preparation method thereof. Background technique [0002] At present, power modules are more and more widely used in new energy vehicles, smart grids, rail transit, inverters, inverter welding machines, induction heating and other fields. However, in the actual use of existing power modules, the heat dissipation problem of power modules It is becoming more and more prominent that the heat dissipation of the power module plays a key role in the life and reliability of the power module, especially with the development of power electronics technology, the requirements for the reliability of the structure and circuit of the power module are higher. [0003] Metal matrix composites are one of the high-performance heat dissipation materials developed rapidly in recent years. By adding various...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/10C22C1/02C09K5/14
CPCC22C1/1036C22C1/1015C09K5/14C22C1/1021C22C1/1073
Inventor 刘湘宁张双玉
Owner 河南瀚银光电科技股份有限公司