Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Fabrication, interface characterization and modeling of oriented graphite flakes/Si/Al composites for thermal management applications
Highlights A novel ternary (graphite flakes/Si/Al) composite was designed and fabricated. The formation of a clean and tightly-adhered graphite/Al interface was revealed. Side surface of graphite/Al interface is devoid of Al4C3 phase and Al–Si–O–C layer. Orientation and interfacial structure contributed to excellent thermal performance.
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 71.1vol.%, the longitudinal (i.e. parallel to the graphite layers) TC of the composites increased from 179 to 526W/mK, while the longitudinal CTE decreased from 12.1 to 7.3ppm/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.
Fabrication, interface characterization and modeling of oriented graphite flakes/Si/Al composites for thermal management applications
Highlights A novel ternary (graphite flakes/Si/Al) composite was designed and fabricated. The formation of a clean and tightly-adhered graphite/Al interface was revealed. Side surface of graphite/Al interface is devoid of Al4C3 phase and Al–Si–O–C layer. Orientation and interfacial structure contributed to excellent thermal performance.
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 71.1vol.%, the longitudinal (i.e. parallel to the graphite layers) TC of the composites increased from 179 to 526W/mK, while the longitudinal CTE decreased from 12.1 to 7.3ppm/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.
Fabrication, interface characterization and modeling of oriented graphite flakes/Si/Al composites for thermal management applications
Zhou, Cong (Autor:in) / Ji, Gang (Autor:in) / Chen, Zhe (Autor:in) / Wang, Mingliang (Autor:in) / Addad, Ahmed (Autor:in) / Schryvers, Dominique (Autor:in) / Wang, Haowei (Autor:in)
05.07.2014
10 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Thermal conductivity of graphite flakes-SiC particles/metal composites
| British Library Online Contents | 2011
| British Library Online Contents | 2018
| British Library Online Contents | 2006
Improvement of field emission of graphite flakes using hydrogen thermal processing
| British Library Online Contents | 2009
Fabrication of Nano-Laminar Glass/Metal Composites by Sintering Glass Flakes
| British Library Online Contents | 2007