銅-グラファイト混合粉焼結時の相対密度におよぼす焼結圧と温度の影響

概要

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Sintering phenomenon was evaluated by experiments and computation for hot pressing and direct current sintering of copper-almina mixed powder. Pure copper powder, pure graphite powder, mixed powders with graphite of 10% and 30% of the volume of copper were sintered. The sintering pressures were 10, 20, and 30MPa while the temperatures were 400, 500, and 600 ℃. The computer program that the author had previously developed for sintered pure powder was modified to predict the density of sintered mixed powders. The density of test piece with 30 % of mixed graphite is about 5% lower than that of pure copper powder. Mixing powders with different diameters improved the densities by 20 to 30% of the added graphite volume. The computed relative densities of copper-graphite powder were within the accuracy of 5% to 9 %.