Abstract
Explosive pressing enables specimens of relative densities up to 95% to be obtained, whereas the maximum attainable density after static pressing does not exceed 70%. There exist optimum sintering temperatures and compact densities, which are different for the static and explosive pressing methods. It is important that the optimum temperature of sintering after explosive pressing is 150°C lower than that of sintering after static pressing. This enables the sintering of the hard metal to take place virtually in the absence of a liquid phase. Explosive pressing is performed without a plasticizer, which simplifies the preparation of the powder mixture, enables the rate of heating in sintering to be increased, and improves the conditions of operation of the sintering furnace. Compared with static pressing, the explosive method ensures an about 50% lower residual porosity, a more fine-grained structure, and higher transverse rupture strength.
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