A kind of composite material and its preparation method and application

A technology of composite materials and mixed materials, which is applied in applications, other household appliances, ceramic products, etc., can solve the problems of increasing interface thermal resistance, which cannot be further improved, and the thermal conductivity of CuSiC is low, so as to achieve the effect of improving thermal conductivity

Active Publication Date: 2020-11-20
BYD CO LTD
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  • Summary
  • Abstract
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Problems solved by technology

[0002] At present, aluminum silicon carbide (AlSiC) metal matrix composite materials are generally used as the heat dissipation base plate. Aluminum silicon carbide is composed of Al alloy and SiC ceramics. The thermal conductivity of Al alloy is theoretically up to 230W / (m K), and SiC theory The thermal conductivity can reach 320W / (m K) or above, so the thermal conductivity of aluminum silicon carbide metal matrix composites is limited by the Al alloy and cannot be further improved
[0003] It has also been reported to use Cu with higher thermal conductivity (thermal conductivity 380-400W / (m K)) instead of Al to prepare aluminum silicon carbide materials, but during the preparation of CuSiC, Cu and SiC will react at high temperatures to form CuSi Compounds, CuSi compounds will greatly increase the interface thermal resistance, making the thermal conductivity of CuSiC much lower than the theoretical value

Method used

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  • A kind of composite material and its preparation method and application
  • A kind of composite material and its preparation method and application
  • A kind of composite material and its preparation method and application

Examples

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preparation example Construction

[0034] The present disclosure provides a preparation method of a composite material, the method comprising: preparing a carbon-coated silicon carbide skeleton; filling copper or a copper alloy into the pores of the carbon-coated silicon carbide skeleton.

[0035] According to the present disclosure, carbon is used to coat the surface of the silicon carbide skeleton (the surface refers to the surface of the silicon carbide skeleton in contact with the air, including both the outer surface of the skeleton and the surface of the internal pores of the skeleton), so as to reduce the contact between silicon carbide and copper or copper alloy. reaction, thereby reducing the generation of copper silicide and improving the thermal conductivity of the composite material. The silicon carbide skeleton is well known to those skilled in the art, and refers to a three-dimensional porous structure formed by sintering silicon carbide particles at high temperature. The carbon coated on the surf...

Embodiment 1

[0047] 100 parts of silicon carbide particles (particle size 20-100 microns), 10 parts of graphite powder (particle size 0.1 microns), 22.5 parts of phenolic resin (liquid) ethanol dispersion (containing 15 parts of phenolic resin, phenolic resin carbon content 45% by weight) and 1 part of polyvinyl alcohol were mixed in a tank mixer for 2 hours to obtain a mixed material.

[0048] The obtained mixed material is granulated in a granulator and passed through a 60-mesh sieve to obtain a powder; the obtained powder is compacted with a compacting machine, the compacting pressure is 15MPa, and the pressure is maintained for 40s to obtain a blank; the obtained blank is Parts were solidified in an oven at 200°C for 30 minutes to obtain a shaped blank; the resulting shaped blank was pyrolyzed in a vacuum atmosphere furnace for 180 minutes under a vacuum condition of 800°C (vacuum degree below 10Pa) to obtain a carbon Coated silicon carbide skeleton.

[0049] Put the obtained carbon-c...

Embodiment 2

[0051] The preparation steps are basically the same as in Example 1, except that graphite powder is used to replace the same weight of phenolic resin to obtain composite material-2. The specific composition and thermal conductivity are shown in Table 1.

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Abstract

The invention relates to a composite material and a preparation method and application thereof. The method comprises the following steps: preparing a carbon-coated silicon carbide framework; and filling pores of the carbon-coated silicon carbide framework with copper or a copper alloy. The composite material provided by the invention has low copper silicide content and good thermal conductivity.

Description

technical field [0001] The present disclosure relates to a composite material and its preparation method and application. Background technique [0002] At present, aluminum silicon carbide (AlSiC) metal matrix composite materials are generally used as the heat dissipation base plate. Aluminum silicon carbide is composed of Al alloy and SiC ceramics. The thermal conductivity of Al alloy is theoretically up to 230W / (m K), and SiC theory The thermal conductivity can reach 320W / (m·K) or above, so the thermal conductivity of aluminum silicon carbide metal matrix composites is limited by the Al alloy and cannot be further improved. [0003] It has also been reported to use Cu with higher thermal conductivity (thermal conductivity 380-400W / (m K)) instead of Al to prepare aluminum silicon carbide materials, but during the preparation of CuSiC, Cu and SiC will react at high temperatures to form CuSi Compounds, CuSi compounds will greatly increase the interface thermal resistance, ma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/10C04B35/565C04B38/06
CPCC04B35/565C04B38/067C04B2235/422C04B2235/48C22C1/1005C22C1/1036
Inventor 吴波刘成臣徐强
Owner BYD CO LTD
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