Abstract
An experimental method was devised to increase the “packing density” of random spherical powder packings by agitation with an applied compressive force. Maximum random packing densities of both monosize and bimodal-size powder packings of various size ratios and volume fractions are compated to the as-received gas-atmoized SS316L powder. Since the presence of a compressive load will tend to restrict the opening of interparticle passages through the powder pack, uniform mixing of the powders beforehand is important for achieving optimum packing. At the same time, however, macroscopic size segregation of mixer-mill-premixed powder packins was found not to be significant using this technique. Densities of optimized bimodal-size powder packings far exceed those of non-optimized packings and the as-received (continuously distributed) powder. This enhancement is also retained during subsequent hot isostatic pressing.
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