Abstract
Deep wall cup shaped compacts were formed by a uniaxial pressing tool, using dry and loose iron powder of controlled particle size distribution prepared by sieving and with the addition of 6μm carbonyl iron powder. The loose powder including 0.7wt% zinc stearate and 0.5wt% of liquid paraffin could be automatically filled into a cylindrical die cavity and formed by a single stepped punch. Avarage green density of formed compact reached a relative density of 90% and the variation in the density throughout a green compact was reduced to less than 2%. Sufficient flowability of the densified powder at the bottom was experimentally confirmed by investigating the change of the density distribution during compaction. It flowed into the cup wall above a certain compacting pressure. Radial crushing strength of the sintered cup wall amounted to 300 MPa.
