Compacting properties of powder mixtures

Summary

• 1. We showed in this paper that the annealing of iron-copper powder mixture has a favorable effect on its compaction properties and also reduces the force needed to eject the compacts. And, vice versa, separate annealing of metallic components of the mixture can produce mixtures with increased ejection friction.

• 2. Apart from the known dry lubricants (zinc stearate, graphite, etc.) powdered sulfur can be used for improving the compaction characteristics.

• 3. All these measures intended to improve the compaction properties of powder mixtures qualitatively change the dependence of the density of parts and the ejection force of compacts on the specific compaction pressures. This makes possible the simplification of calculations needed to determine the physical properties of parts being compacted.

• 4. The relationships established here enable the selection for compacting powder mixtures of conditions in which this operation can be performed more rapidly and within an automatic mass-production cycle.