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Article Dans Une Revue Journal of Materials Science Année : 2018

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

Résumé

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.

Domaines

Matériaux
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Dates et versions

hal-01794214 , version 1 (24-11-2023)

Identifiants

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Valerio Oddone, Jakob Segl, Mythili Prakasam, Martin Hartmann, Jean-François Silvain, et al.. Isotropic thermal expansion in anisotropic thermal management composites filled with carbon fibres and graphite. Journal of Materials Science, 2018, 53 (15), pp.10910-10919. ⟨10.1007/s10853-018-2373-6⟩. ⟨hal-01794214⟩
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