Particle rearrangement during powder compaction
- Cite this article as:
- Liu, J. & De Lo, D.P. Metall and Mat Trans A (2001) 32: 3117. doi:10.1007/s11661-001-0186-7
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Densification in powder compaction occurs due to the motion of particle centers toward each other, including particle rearrangement and particle deformation. The process of particle sliding and rearrangement has a critical influence on densification in practice, especially during the first stage of compaction. Analytic models and experimental measurements show that the movements of individual particles within a powder compact cause continuous tightening of the bulk packing state up to a fractional compact density of 0.92. For a mass of powder with an initial packing density of 0.64, up to a 40 pct green density increase during the first stage of densification occurs by particle rearrangement. The present study proposes a parameter, termed the particle-packing factor, that describes the packing state due to both deformation and rearrangement.