Phenomenological modeling of warm compaction and experimental verification

A phenomenological modeling approach to establishing the warm compaction equation and curves by modifying the regression equation of the room-temperature compaction curve is presented. An enhanced factor of compacting pressure is introduced into the equation in order to reveal the effects of powder/die temperature and filling height of powders on green density. Compaction curves yielded from this equation are consistent with the experimental data of ATOMET grade iron powders. The curves show that the powder/die temperature should reduce as the filling heights of powders increase and that in some cases warm compaction can not give rise to a higher green density.