Synergetic Effect of Discontinuous Carbon Fibers and Graphite Flakes on Thermo-Mechanical Properties of Aluminum Matrix Composites Fabricated by Solid–Liquid Phase Sintering

Nabil Chamroune; Florence Delange; Nathalie Caillault; Fabrice Morvan; Yongfeng Lu; Akira Kawasaki; Jean‑François Silvain

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자료유형: 학술저널

저자정보: Nabil Chamroune (Univ. Bordeaux) Florence Delange (Schneider Electric SAS) Nathalie Caillault (Schneider Electric SAS) Fabrice Morvan (Toyal Europe SASU) Yongfeng Lu (University of Nebraska-Lincoln) Akira Kawasaki (Tohoku University) Jean‑François Silvain (Univ. Bordeaux)

저널정보: 대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.26 No.2

발행연도: 2020.1

수록면: 155 - 167 (13page)

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Aluminum (Al) matrix composite materials reinforced with graphite fakes (GF) and pitch-based carbon fbers (CF) werefabricated by solid–liquid phase sintering with a small amount of Aluminum–Silicon eutectic alloy (Al-12 wt%Si). Theamount of Al–Si is optimized for a carbon content of 50 vol% in order to achieve, in the plane of GF reinforcement, a higherthermal conductivity (TC) and a lower coefcient of thermal expansion (CTE) compared to identical composite material fabricated by conventional powder metallurgy route. Al/(GF+CF) composite materials were characterized by scanning electronmicroscopy (SEM), energy-dispersive X-ray microscopy and X-ray tomography in order to highlight the distribution of theAl–Si liquid phase and the formation of a carbon network in the aluminum matrix. A small amount of CF allows to controlthe through-plane CTE without afecting signifcantly the in-plane TC of the Al-C composites. The (GF+CF) mixture andthe solid–liquid phase sintering allow to achieve a TC of 410 W/m K (in-plane direction) and a CTE of 2.4×10−6/K (troughplane direction), which is, for example, applicable for lightweight heat sink material.

#Metal-matrix composites (MMCs) · Discontinuous reinforcement · Powder processing · Thermal properties

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