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Nabil Chamroune,Florence Delange,Nathalie Caillault,Fabrice Morvan,Yongfeng Lu,Akira Kawasaki,Jean‑François Silvain 대한금속·재료학회 2020 METALS AND MATERIALS International Vol.26 No.2
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.