固-液共存状態を利用してSPS成形したAg/ダイヤモンド複合材料の組織と熱伝導率

概要

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Diamond-particle-dispersed-silver (Ag) matrix composites were fabricated in solid-liquid co-existent state by Spark Plasma Sintering (SPS) process from the mixture of diamond powders, Ag powders and Si powders. The microstructures and thermal conductivities of the composites fabricated were examined. These composites were all well consolidated by heating at a temperature range between 1113 K and 1188 K for 0.45 ks during SPS process. No reaction at the interface between the diamond particle and the Ag matrix was observed by scanning electron microscopy for the composites fabricated under the sintering conditions employed in the present study. The relative packing density of the diamond-Ag composite fabricated was 95-97 % in a volume fraction range of diamond between 40 % and 50 %. Thermal conductivity of the diamond-Ag composite containing 50 vol.% diamond reached 717 W/mK, approximately 80 % the theoretical thermal conductivity estimated using Maxwell-Euckens equation.
2009-12-15