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
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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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