Radial and axial spring-backs of electrolytic iron powder compacts (φ10 ×h 10 mm) were determined. After the dewaxing at 600°Cfor 30 min and the sintering at 1100°C for 60 min in cracked-ammonia, the dimensional change of the compacts were measured.
The spring-back of the compacts containing zinc stearate increased with the pressure in both directions. The axial spring-back increased with the content of zinc stearate.
The dimensional change in the axial direction by sintering was a shrinkage which appeared to com-pensate a part of the porosity formed by the spring-back. While it was a dilation in the radial direction.
In the axial direction, there exists an obvious relationship between the spring-back and the dimensional change by sintering. But not in the radial direction