Preparation method of laminated graphene/metal composite for high-speed train IGBT packaging

A metal composite material, layered graphite technology, applied in the direction of metal material coating process, coating, etc., can solve the problems of difficult process amplification, complicated process, etc., to achieve easy process amplification, increase thermal conduction channels, and excellent planar thermal conductivity. Effect

Active Publication Date: 2018-12-18
LANZHOU JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the layered graphene / metal composite material is prepared by repeated layer-by-layer (Layer-by-Layer) method of graphene and metal thin layers, the process is very cumbersome, and it is not easy to scale up the process and carry out large-scale preparation.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A layered graphene / copper composite with a planar thermal conductivity of 580 W / mK was prepared.

[0018] The copper foil was ultrasonically cleaned with acetone for 30 min, and then the cleaned copper foil was folded 50 layers in an "accordion" style, and a 3 mg / mL graphene oxide solution was prepared. Transfer the folded metal foil together with the graphene oxide solution into a hydrothermal reactor and heat at 160 °C for 8 h. After the hydrothermal reaction, the graphene-coated copper foil was transferred to a tube furnace and reduced for 60 min at 1100 °C in an argon / hydrogen (9:1 v / v) atmosphere. The obtained graphene / copper foil sample was cold-pressed (500 MPa) and then hot-pressed and sintered at 1000 °C for 60 min under vacuum conditions at a pressure of 100 MPa to obtain a layered graphene / copper composite material.

Embodiment 2

[0020] A layered graphene / copper composite with a planar thermal conductivity of 620 W / mK was prepared.

[0021] The copper foil was ultrasonically cleaned with acetone for 30 min, and then the cleaned copper foil was folded 100 layers in an "accordion" style, and a 1 mg / mL graphene oxide solution was prepared. Transfer the folded copper foil together with the graphene oxide solution into a hydrothermal reactor, and heat at 160°C for 6h. After the hydrothermal reaction, the graphene-coated copper foil was transferred to a tube furnace and reduced for 60 min at 1100 °C in an argon / hydrogen (9:1 v / v) atmosphere. The obtained graphene / copper foil sample was directly cold-pressed (500 MPa) and then hot-pressed and sintered at 1100 °C for 60 min under vacuum conditions at a pressure of 200 MPa to obtain a layered graphene / copper composite material.

Embodiment 3

[0023] A layered graphene / nickel composite with a planar thermal conductivity of 480 W / mK was prepared.

[0024] The nickel foil was ultrasonically cleaned with acetone for 30 min, and then the cleaned nickel foil was folded 100 layers in an "accordion" style, and a 2 mg / mL graphene oxide solution was prepared. Transfer the folded nickel foil together with the graphene oxide solution into a hydrothermal reactor and heat at 160 °C for 8 h. After the hydrothermal reaction, the graphene-coated nickel foil was transferred to a tube furnace and reduced for 60 min at 1500 °C in an argon / hydrogen (9:1 v / v) atmosphere. The obtained graphene / nickel foil sample was cold-pressed (500 MPa) and then hot-pressed and sintered at 1500 °C for 60 min under vacuum conditions at a pressure of 200 MPa to obtain a layered graphene / nickel composite material.

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Abstract

The invention belongs to the field of electronic packaging materials, and relates to a preparation method of a laminated graphene/metal composite for high-speed train IGBT packaging. The preparation method comprises the following steps that a metal foil is folded into a plurality of layers in an accordion manner, and an oxidized graphene solution with a finite concentration is prepared; the foldedmetal foil together with the oxidized graphene solution is transferred into a hydrothermal reaction kettle for hydrothermal reaction; after the reaction is completed, the metal foil plated with a graphene thin layer is transferred into a tube furnace for further thermal reduction; and an obtained graphene/metal foil is subjected to cold-pressed moulding and then hot-pressed sintering, so that thelaminated graphene/metal composite is obtained finally. The preparation method is simple in technological operation and low in cost, and facilitates process amplification; the composite is provided with a laminated structure so that the excellent plane heat conductivity of graphene can be exerted to the full extent. The plane heat conductivity of the prepared laminated graphene/metal composite is480-680 W/mK so that the heat dissipation requirement of the high-speed train IGBT packaging can be met.

Description

technical field [0001] The invention belongs to the field of electronic packaging materials, and relates to a method for preparing a layered graphene / metal composite material for high-speed train IGBT packaging. Background technique [0002] With the rapid development of high-speed rail technology, the assembly density of IGBT, the core component of the traction converter in high-speed trains, has increased rapidly, and the heat dissipation capacity has become a key limiting factor affecting the service life of IGBT. The use of packaging materials with excellent thermal conductivity has become a solution to the problem of IGBT heat dissipation. best way. Since the metal matrix composites (MMCs) combine the excellent thermal conductivity of the metal matrix and the reinforcement and the low expansion characteristics of the reinforcement, since the 1990s, along with the emergence of various high-density packaging technologies, electronic packaging has been used High thermal c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/10C22C9/00C23C26/00
CPCC22C1/10C22C9/00C23C26/00
Inventor 褚克王小虎耿中荣黄大建
Owner LANZHOU JIAOTONG UNIV
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