Effect of Core-Shell Structure on Compaction Behavior of Harmonic Powder

In this study, effect of core-shell structure on compaction behavior of harmonic powder is investigated.Harmonic powders are made by electroless plating method on Fe powders. Softer Cu shell encloses harder Fe core, andthe average size of Fe core and thickness of Cu shell are 34.3 µm and 3.2 µm, respectively. The powder compactionprocedure is processed with pressure of 600 MPa in a cylindrical die. Due to the low strength of Cu shell regions, theharmonic powders show better densification behavior compared with pure Fe powders. Finite element method (FEM) isperformed to understand the roll of core-shell structure. Based on stress and strain distributions of FEM results, it isconcluded that the early stage of powder compaction of harmonic powders mainly occurs at the shell region. FEMresults also well predict porosity of compacted materials. Keywords: Harmonic powder, Finite element method, Shell compaction region, Compaction behavior ······························································································································· ·································································································