CONTAINER INFLUENCE ON SHRINKAGE UNDER HOT ISOSTATIC PRESSING - I - SHRINKAGE ANISOTROPY OF A CYLINDRICAL SPECIMEN

A mathematical model of isostatic pressing in a cylindrical container is elaborated. The influence of the container geometry, the container and the powder constitutive properties on shrinkage anisotropy (change of the powder specimen's aspect ratio) is analyzed. The idea of using containers with different thicknesses of the lateral and end face wal ls for controlling the shrinkage anisotropy is suggested. Model experi ments on HIPing of copper powder in a copper container are carried out . The design principle of proportionality of the ratio of container wa ll thicknesses and the ratio of container internal dimensions is analy tically derived and experimentally tested. (C) 1998 Elsevier Science L td. All rights reserved.