MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
Influence of Particle Shape on Microstructure and Magnetic Properties of Iron Powder Cores
Takuya TakashitaNaomichi NakamuraYukiko Ozaki
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2016 Volume 57 Issue 11 Pages 1859-1867

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Abstract

The coercive force of an iron powder core decreases with an increase in the circularity of the base iron powder. Microstructural observation reveals that the crystal grain size of the iron powder core is reduced by recrystallization during stress relief annealing after powder compaction. An analysis of the work hardening behavior during the compaction process shows that a rounder particle shape leads to smaller particle deformation, resulting in a reduced grain refinement effect during recrystallization. A grain boundary pinning model convincingly describes the reduction of coercive force with the increase in the eventual grain size.

 

This Paper was Originally Published in Japanese in J. Japan Inst. Met. Mater. 79 (2015) 315–323.

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© 2016 The Japan Institute of Metals and Materials
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