Densification in Long Cylinder-Shaped Compacts from Iron Powder Admixed with Fine Iron Powder by Flow Compaction.

A long cylinder-shaped compacts were formed by a single-action tooling from dry and loose iron powder admixed with 1 mass% zinc stearate, 10% fine iron powder and 1% micro wax powder. Avarage green density of formed compact reached a relative density of 88%, and the variation in density throughout the green compact was reduced to less than 3% in the height of 40 mm. Sufficient flowability of densified powder at pressing side was experimentally confirmed by investigating the change of density distribution during compaction and the flowability was effective by admixing with fine spherical powder. The radial crushing strength of the sintered compact amounted to 400 MPa.