Kiyoshi Mizuuchi1, Kanryu Inoue2, Yasuyuki Agari3, Shinji Yamada4, Masami Sugioka1, Masao Itami1, Masakazu Kawahara5 and Yukio Makino6
1Materials Science & Processing, Osaka Municipal Technical Research Institute, Osaka 536-8553
Diamond particle dispersed copper (Cu) matrix composites were fabricated from Cu-coated diamond particles by Spark Plasma Sintering (SPS) process, and their microstructures and thermal conductivities were examined. Cu-coated diamond particles were readily consolidated into composites at temperatures between 973 K and 1173 K. No reaction at the interface between the diamond particle and the Cu matrix was observed at the sintering temperature range applied in the present study. The relative packing density of the composite fabricated increased with increasing the sintering temperature and the holding time, and reached as high as 99.2% when sintered at 1173 K for 2.1 ks. Thermal conductivity of the composite including 43.2 vol.% diamond particles attained 654 W/mK, when the relative packing density of the composite was 99.2%. This value was about 83% of the thermal conductivity estimated by Maxwell-Eucken's equation.
thermal conductivity, spark plasma sintering, pulsed current, copper, diamond, composite
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