Fabrication,interface characterization and modeling of oriented graphite flakes/Si/Al composites for thermal management applications |
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| Affiliation: | 1. State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China;2. Unité Matériaux et Transformations, UMR CNRS 8207, Bâtiment C6, Université Lille 1, 59655 Villeneuve d’Ascq, France;3. Electron Microscopy for Materials Science (EMAT), University of Antwerp, Groenenborgerlaan 171, 2020 Antwerp, Belgium;1. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, PR China;2. College of Applied Science, Harbin University of Science and Technology, Harbin, PR China;3. College of Mechanical and Electrical Engineering, Harbin Engineering University, Harbin, PR China;1. ICMMO/SP2M UMR CNRS 8182, Université Paris-Sud, bat. 410, 91405 Orsay Cédex, France;2. State Key Laboratory of Metal Composites, Shanghai Jiao Tong University, 200240 Shanghai, China;1. Department of Materials Engineering, University of Leuven (KU Leuven), Kasteelpark Arenberg 44 bus 2450, Leuven B3001, Belgium;2. Departament de Física, Universitat de les Illes Balears, Cra Valldemossa km 7.5, Palma de Mallorca E07122, Spain;3. ITMO University, 49 Kronverkskiy av., St. Petersburg 197101, Russia;4. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, People’s Republic of China;5. Electron Microscopy for Materials Science (EMAT), University of Antwerp, Groenenborgerlaan 171, Antwerp B2020, Belgium;1. State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China;2. Department of Materials Science and Engineering, The University of Texas at Dallas, Richardson, TX 75080, USA;1. State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai, 200240, PR China;2. Unité Matériaux et Transformations, CNRS UMR 8207, Université de Lille, Villeneuve d''Ascq, 59655, France;3. School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, PR China;4. Key Laboratory of Neutron Physics, Institute of Nuclear Physics and Chemistry, CAEP, Mianyang, 621900, PR China |
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| Abstract: | Highly thermally conductive graphite flakes (Gf)/Si/Al composites have been fabricated using Gf, Si powder and an AlSi7Mg0.3 alloy by an optimized pressure infiltration process for thermal management applications. In the composites, the layers of Gf were spaced apart by Si particles and oriented perpendicular to the pressing direction, which offered the opportunity to tailor the thermal conductivity (TC) and coefficient of thermal expansion (CTE) of the composites. Microstructural characterization revealed that the formation of a clean and tightly-adhered interface at the nanoscale between the side surface of the Gf and Al matrix, devoid of a detrimental Al4C3 phase and a reacted amorphous Al–Si–O–C layer, contributed to excellent thermal performance along the alignment direction. With increasing volume fraction of Gf from 13.7 to 71.1 vol.%, the longitudinal (i.e. parallel to the graphite layers) TC of the composites increased from 179 to 526 W/m K, while the longitudinal CTE decreased from 12.1 to 7.3 ppm/K (matching the values of electronic components). Furthermore, the modified layers-in-parallel model better fitted the longitudinal TC data than the layers-in-parallel model and confirmed that the clean and tightly-adhered interface is favorable for the enhanced longitudinal TC. |
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| Keywords: | Composites Graphite flake Thermal conductivity Interface structure Amorphous |
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