SHEN, Zhengyan; JI, G; ADDAD, Ahmed; LABRUGÈRE, Christine; LU, Yongfeng; SILVAIN, Jean-François

doi:10.1016/j.diamond.2021.108513

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SHEN, Zhengyan
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
Unité Matériaux et Transformations - UMR 8207 [UMET]
Institute of New Materials

JI, G
Unité Matériaux et Transformations - UMR 8207 [UMET]

ADDAD, Ahmed
Unité Matériaux et Transformations - UMR 8207 [UMET]

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Diamond and Related Materials. 2021, vol. 118, p. 108513

Elsevier

Résumé en anglais

An Al matrix composite reinforced with 40 vol% graphite flake (Gf) was developed by powder metallurgy as a promising candidate for thermal management applications. Thermal conductivity (TC) along the orientation direction of the composite sintered at 640 °C was measured to be 452 W/m K, which is approximate to the highest TC value theoretically predicted by effective medium approximation model. The three underlying mechanisms responsible for such TC enhancement were clarified in terms of microstructure characterization. First, heat treatment of as-received Gf under Ar + H2 atmosphere resulted in reduction of defects on the edge contributing to improvement of interface thermal exchange efficiency between Al and Gf. Second, image analysis quantitatively confirmed that a step-by-step die filling process using the spherical powder ensures the perfect orientation of Gf in the Al matrix. Third, it was found that the TC of the composite increases with the sintering temperature from 580 to 640 °C. The formation of a small amount of fine platelet-like Al4C3 at the interface between the side surface of Gf and Al matrix indicates the desirable bonding state for minimizing interfacial thermal resistance, beneficial for the overall TC enhancement. Besides, the relevant coefficient of thermal expansion and bending strength were discussed.< Réduire

Mots clés en anglais

Graphite flake/Al composite materials

Thermal conductivity

Powder filling process

Sintering

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Tailoring the microstructure of an oriented graphite flake/Al composite produced by powder metallurgy for achieving high thermal conductivity

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