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권한상,Marc Leparoux,Jean-Marc Heintz,Jean-François Silvain,Akira Kawasaki 대한금속·재료학회 2011 METALS AND MATERIALS International Vol.17 No.5
We have successfully fabricated highly densified aluminum (Al)-diamond composite materials by a simple hot press method. The thermal conductivity of the Al-diamond composite materials was measured. These materials had different types, sizes and fractions of diamond. These obtained values were discussed based on theoretically calculated values. The thermal conductivity of the composite materials, measured by Laser-Flash method, was found to have slightly increased compared to that of pure bulk Al. The obtained microstructures of the composite materials showed a lot of cleavage existing in the interface between the Al matrix and the diamond particles, which led to the low increment of the thermal conductivity. Moreover, Al-diamond bulk materials with different sintering temperatures in solid state, liquid phase, and transient region between solid and liquid of Al, have been synthesized.
Spark Plasma Sintering Behavior of Pure Aluminum Depending on Various Sintering Temperatures
권한상,박대훈,박용하,Jean François Silvain,Akira Kawasaki,박용호 대한금속·재료학회 2010 METALS AND MATERIALS International Vol.16 No.1
We have successfully fabricated high-density pure aluminum (Al) bulk by means of a spark-plasma-sintering (SPS) process. The relative density of Al was enhanced as the sintering temperature of the SPS process increased. During the SPS process for pure Al power, the Al oxide layer on the surface of the Al particle was partially broken by the microplasma and applied pressure. The microstructures of the spark-plasma-sintered compacts obtained at various temperatures were observed by optical microscopy, field-emission scanning electron microscopy, and high-resolution transmission electron microscopy. We believe that the pinning effect,rapid heating cycle, and applied pressure played an important role in restraining the particle growth despite the increase in sintering temperature. It is feasible that the employed SPS process could be very useful to achieve fully densified Al compact.
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.