ODDONE, Valerio; SEGL, Jakob; PRAKASAM, Mythili; HARTMANN, Martin; SILVAIN, Jean-François; EDTMAIER, Christian; REICH, Stephanie

doi:10.1007/s10853-018-2373-6

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ODDONE, Valerio
Department of Physics

SEGL, Jakob
Institute of Chemical Technologies and Analytics

PRAKASAM, Mythili
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

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Journal of Materials Science. 2018, vol. 53, n° 15, p. 10910-10919

Springer Verlag

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Light materials with high thermal conductivity and low thermal expansion have a wide application potential for the thermal management of high-performance electronics, in particular in mobile and aerospace applications. We present here metal matrix composites with a mixture of graphite flakes and pitch-based carbon fibres as filler. The production by spark plasma sintering orients the filler particles on to a plane perpendicular to the pressing axis. The obtained materials have lower density than aluminium combined with a thermal conductivity significantly outperforming the used metal matrix. Depending on the ratio of the filler components, a low thermal expansion along the pressing direction (high graphite flakes content) or across the pressing direction (high carbon fibre content) is achieved. For a 1:3 ratio of carbon fibres to graphite, we measured an isotropic reduction of the thermal expansion of the matrix by up to 55%. We present a detailed characterisation of composites with two aluminium alloys as matrix and an overview of the properties for six different metal matrices including magnesium and copper. With the goal of a technical application, we show that the described properties are intrinsic to the material compositions and are achieved with a wide spectrum of production methods.< Réduire

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Isotropic thermal expansion in anisotropic thermal management composites filled with carbon fibres and graphite

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