Shock compaction of powder by using an underwater shock wave is studied and the technical advantages are reported. In this research, we propose a technique for shock compaction of copper/diamond powders by using an underwater shock wave generated by the detonation of explosive. This process produces a composite material in which the particles are strongly bonded due to melting caused by strong deformation and rapid solidification at the particle surface. The improvement of the thermal conductivity of the composite material collected is expected, because the diamond has a high thermal conductivity. Good compacts of composite materials in which diamond particles were dispersed in the copper matrix were obtained in this experiment, and their microstructures and thermal properties were examined. Moreover, pressure measurements and numerical calculations were performed to assess the effect of the pressuring condition in the explosive container.

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