Graphite-metal heat conduction composite material and preparation method thereof

A metal composite material and composite material technology, applied in the field of graphite-metal thermally conductive composite materials and their preparation, can solve the problems of low bonding capacity, high equipment requirements, poor wettability, etc., and achieve good thermal conductivity and high bonding strength. Effect

Active Publication Date: 2015-11-25
宁波赛墨科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the difficulty in the preparation of graphite-metal composites lies in: poor wettability and poor bonding between graphite and metal, and in the preparation process of commonly used graphite-metal composites, such as graphite-aluminum reaction will produce easily hydrolyzed phase Al 4 C 3 , the binding capacity between graphite and copper i

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  • Graphite-metal heat conduction composite material and preparation method thereof
  • Graphite-metal heat conduction composite material and preparation method thereof
  • Graphite-metal heat conduction composite material and preparation method thereof

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preparation example Construction

[0064] In the preparation method of the present invention, the pressure infiltration reaction is usually carried out at 400-1500°C (preferably 600-1500°C), and the reaction time is usually 1-200 minutes (preferably 10-30 minutes) .

[0065] The present invention provides a method for preparing a graphite-metal composite material, which preferably includes the steps:

[0066] (1) Preparation of graphite composite:

[0067] (1.1) Provide a mixture containing graphite particles, carbide-forming elements and salt; preferably, the mass fraction of the salt is 30-80 wt% based on the total weight of the mixture; preferably, 50-70 wt%.

[0068] Calculated by the total weight of the mixture, the mass fraction of carbide forming elements is 0.1-10 wt%; preferably, it is 2-5 wt%; more preferably, it is 3-7.5 wt%.

[0069] (1.2) Under vacuum, the mixture obtained in step (1.1) is heated and reacted (for example, at 600-1500°C or 800-1300°C), the product obtained is washed with water (such as deion...

Embodiment 1

[0085] Preparation of graphite-aluminum composite material No.1:

[0086] 1.1. Preparation of graphite-chromium carbide-chromium composite

[0087] Take the scaly graphite powder with a particle size of 300μm~500μm, sodium chloride and a small amount of chromium powder and mix uniformly to make a mixed powder. According to the total weight of the mixed powder, sodium chloride accounts for 75wt% and chromium powder accounts for 5wt%. Put it into a vacuum carbon tube furnace, evacuate to a vacuum of about 10-220Pa, a heating rate of 15°C / min, raise the temperature to 900°C, hold for 60min, and then cool to room temperature along with the furnace. Take out the mixed powder treated at high temperature, put it into a beaker containing deionized water, put the beaker containing the treated mixed powder and deionized water into the drying box, set the temperature to 85°C, keep it warm for 30 minutes, take out the beaker and Pour out the aqueous solution of sodium chloride, re-pour deioni...

Embodiment 2

[0091] Example 2 Preparation of graphite-aluminum composite material No. 2

[0092] 2.1 Preparation of graphite-boron carbide-boron composite

[0093] Take flake graphite powder with a particle size of 300μm~500μm, sodium chloride and a small amount of boron powder to make a mixed powder. Calculate the total weight of the mixed powder, sodium chloride accounts for 75wt% and boron powder accounts for 5wt%. Put it into a vacuum carbon tube furnace, evacuate to a vacuum of about 10~220Pa, heat it up to 1500°C at a heating rate of 15°C / min, keep it for 60min, and then cool it to room temperature along with the furnace. Take out the mixed powder treated at high temperature, put it into a beaker containing deionized water, put the beaker containing the treated mixed powder and deionized water into the drying box, set the temperature to 85°C, keep it warm for 30 minutes, take out the beaker and Pour out the aqueous solution of sodium chloride, re-pour in deionized water and repeat the ab...

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Abstract

The invention relates to a graphite-metal heat conduction composite material and a preparation method thereof. The graphite-metal heat conduction composite material comprises a metal base body and a graphite composite body distributed in the interior and/or the surface of the metal base body. The graphite composite body comprises graphite particles, a carbide layer and a carbide forming element layer, wherein the carbide layer is combined to the surfaces of the graphite particles, and the carbide forming element layer is combined to the surface of the carbide layer; carbide forming elements comprise B, Si, Cr, W and Mo; carbides comprise a boron carbide, a silicon carbide, a tungsten carbide, a chromium carbide and a molybdenum carbide; and the graphite composite body is combined with the metal base body through the carbide forming element layer. The composite material has the excellent performance and is widely applied.

Description

Technical field [0001] The invention belongs to the field of thermally conductive composite materials. Specifically, the present invention relates to a graphite-metal thermally conductive composite material and a preparation method thereof. Background technique [0002] With the rapid development of the electronic technology industry, more and more heat is dissipated per unit area of ​​devices, which puts more stringent requirements on the performance of thermal management materials. As an important part of the development of electronic packaging materials, materials are required to have high thermal conductivity, low expansion coefficient, light weight, and low cost. However, although the traditional Al / SiC composite materials, Cu / W composite materials and Cu / Mo composite materials and other special alloy materials have low thermal expansion coefficients, they have all undergone special processing, sacrificing the performance of the materials in terms of thermal conductivity an...

Claims

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Application Information

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IPC IPC(8): B22F7/02B22F3/14B32B15/04B32B9/04
Inventor 马洪兵白华江南王栋邹煌辉杨科褚伍波
Owner 宁波赛墨科技有限公司
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