The microstructures and properties of graphite flake/copper composites with high volume fractions of graphite flake

LIU Ben; ZHANG Dong-qing; LI Xiang-fen; GUO Xiao-hui; SHI Jing; LIU Zhan-jun; GUO Quan-gui

doi:10.1016/S1872-5805(20)60475-9

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LIU Ben, ZHANG Dong-qing, LI Xiang-fen, GUO Xiao-hui, SHI Jing, LIU Zhan-jun, GUO Quan-gui. The microstructures and properties of graphite flake/copper composites with high volume fractions of graphite flake. New Carbon Mater., 2020, 35(1): 58-65. doi: 10.1016/S1872-5805(20)60475-9

Citation:

LIU Ben, ZHANG Dong-qing, LI Xiang-fen, GUO Xiao-hui, SHI Jing, LIU Zhan-jun, GUO Quan-gui. The microstructures and properties of graphite flake/copper composites with high volume fractions of graphite flake. New Carbon Mater., 2020, 35(1): 58-65. doi: 10.1016/S1872-5805(20)60475-9

Citation:

LIU Ben, ZHANG Dong-qing, LI Xiang-fen, GUO Xiao-hui, SHI Jing, LIU Zhan-jun, GUO Quan-gui. The microstructures and properties of graphite flake/copper composites with high volume fractions of graphite flake. New Carbon Mater., 2020, 35(1): 58-65. doi: 10.1016/S1872-5805(20)60475-9

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The microstructures and properties of graphite flake/copper composites with high volume fractions of graphite flake

doi: 10.1016/S1872-5805(20)60475-9

1.
Director of Key Lab of Carbon Materials, Institute of Coal Chemistry, Chinese Academy of Sciences Taoyuan south road 27, Taiyuan 030001, China;
2.
Analytical Instrumentation center, State Key Laboratory of Coal Conversion, Institute of coal chemistry, Chinese Academy of Sciences, Taoyuan south road 27, Taiyuan 030001, China

Funds: Key Research and Development Plan of Shanxi Province (201603D121016).

Received Date: 2019-10-20
Accepted Date: 2020-04-02
Rev Recd Date: 2020-01-10
Publish Date: 2020-02-29

Abstract

Abstract

Graphite flake (average lateral size of 292 μm and average thickness of 13 μm)/copper composites with high volume fractions (72.08%-93.34%) of graphite flake were produced by a vacuum hot pressing method. Results show that the composites are anisotropic due to the alignment of the surface planes of the graphite flakes perpendicular to the pressing direction. With increasing volume fraction of graphite flakes, the density of the composites decreased from 4.07 to 2.63 g cm^-3, with the relative density apparently decreasing when the volume fraction of the flakes is more than 82.6%. In addition, the in-plane electrical conductivity decreased from 14.71% to 2.45% of the international annealed copper standard, the in-plane coefficient of thermal expansion decreased from 6.6 to 2.2×10^-6/K, the in-plane bend strength decreased from 42.48 to 14.63 MPa, and the in-plane compressive strength decreased from 45.75 to 20.46 MPa while the in-plane thermal conductivity showed a maximum of 663.73 W m^-1 K^-1 at a volume fraction of GF 82.6%. The maximum in-plane thermal conductivity is caused by inter-flake pores that are not fully infiltrated by Cu. The in-plane and out-of-plane thermal conductivity agree well with a modified layers-in-parallel model and a modified layers-in-series model, respectively.
- High volume fraction,
- Graphite flakes/copper composites,
- Thermal conductivity,
- Coefficients of thermal expansion,
- mechanical properties

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