Procedure for the manufacture of multilevel pieces of agglomerated spherical metallic powder

摘要

A method for manufacturing a multilevel metal part, said method comprising the steps: a. compacting agglomerated spherical metal powder to a non-sintered multilevel preform with a density such that an open porosity exists, wherein the unsintered multilevel preform has at least two different heights in the z-direction in a three-dimensional Cartesian coordinate system, in which the ratio between the highest height zh and the lowest height zl (zh / zl) is at least 1.1, where the non-sintered multilevel preform meets the relationship zg = zHVC. a, for all points in the xy plane, in which zg is the z-direction height variable of the non-sintered multilevel preform in the z-direction, where zHVC is the z-direction height variable of the part after high speed compaction in step (d), and in which a is a constant related to the compaction ratio. b. deagglomerate the unsintered preform, c. sintering the non-sintered preform in an atmosphere comprising hydrogen with a dew point not exceeding -40 ° C. d. compacting the unsintered preform uniaxially along the z axis with high speed compaction to a density of at least 95% TD, e. subject the part to densification to a density of at least 99% TD.