Metallurgical and Materials Transactions A

, Volume 32, Issue 12, pp 3117–3124

Particle rearrangement during powder compaction

  • Jianxin Liu
  • David P. De Lo
Article

DOI: 10.1007/s11661-001-0186-7

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

Abstract

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.

Copyright information

© ASM International & TMS-The Minerals, Metals and Materials Society 2001

Authors and Affiliations

  • Jianxin Liu
    • 1
  • David P. De Lo
    • 1
  1. 1.the Prometal Division, Extrude Home CorporationIrwin