The behaviour of pores in metal-powder compacts during solid-phase sintering is examined, and theoretical considerations are compared with practical observations. Elimination of porosity is possible in very thin specimens by selecting a relatively fine powder. With thicker compacts it is also necessary to bring the specimen very slowly up to the sintering temperature. When the dimensions exceed a few centimetres, however, porosity can only be eliminated by increasing the rate of sintering by the addition of another metal; the conditions governing such additions are defined.
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