Thermal Properties of Al/β-SiC Composite Fabricated by Spark Plasma Sintering (SPS)

Kiyoshi Mizuuchi ； Kanryu Inoue ； Yasuyuki Agari ； Masakazu Kawahara ； Yukio Makino ； Mikio Ito

《Journal of Metallurgical Engineering》 3卷2期 (2014/04) Pp. 59-68

https://doi.org/10.14355/me.2014.0302.01

並列摘要

β-SiC-particle-dispersed-aluminum (Al) matrix composite was fabricated in solid-liquid co-existent state by spark plasma sintering ( SPS) process from the mixture o f β -SiC powders, Al powders and Al-5 mass% Si powders. The microstructures and thermal conductivities of the composite fabricated were examined. This composite was all well consolidated by sintering at a temperature range between 798 and 876 K for 1.56 ks during SPS process. No reaction at the interface between the β-SiC particle and the Al matrix was observed by scanning electron microscopy for the composite fabricated under the sintering conditions. The relative packing density of the Al-matrix composite with dispersed β-SiC particles was higher than 99% in a volume fraction range of SiC between 40 and 50 %. Thermal conductivity of the composite was higher than 200 W/mK in a β-SiC volume fraction range between 40 and 50 vol.%. The highest thermal conductivity was obtained for Al-45 vol.%β- SiC composite and it is 216 W/mK. The coefficient of thermal expansion of the composite is (14~16)×10^(-6) /K and falls in the upper line of Kerner's model. This indicates strong bonding between the β-SiC particle and the Al matrix in the composite.text.

並列關鍵字

Metal-matrix Composites (MMCs) ； Particle-reinforcement ； Thermal Properties ； Sintering ； Silicon Carbide ； Aluminum