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1. (WO2018180416) IRON-BASE POWDER FOR DUST CORE

Pub. No.:    WO/2018/180416    International Application No.:    PCT/JP2018/009443
Publication Date: Fri Oct 05 01:59:59 CEST 2018 International Filing Date: Tue Mar 13 00:59:59 CET 2018
IPC: B22F 1/02
Applicants: KABUSHIKI KAISHA KOBE SEIKO SHO (KOBE STEEL, LTD.)
株式会社神戸製鋼所
Inventors: URUSHIBATA Satomi
漆畑 里美
HOJO Hirofumi
北条 啓文
TAKAMATSU Yohei
高松 洋平
Title: IRON-BASE POWDER FOR DUST CORE
Abstract:
Provided is an iron-base powder for a dust core with which a dust core exhibiting high relative permeability and low iron loss can be obtained even under conditions such as a drive frequency of less than 1 kHz. This iron-base powder for a dust core includes iron-base particles, and these iron-base particles have an iron-base core body and an insulating coating that covers the surface of this iron-base core body. The average particle size D50 of the iron-base core body is 150 – 250 µm, and the insulating coating has at least a two-layer structure of a lower layer formed from a phosphate-based conversion coating and an upper layer formed from a silicone resin coating laminated onto this lower layer. The phosphorus content of the iron-base particles having the phosphate-based conversion coating is 0.012 – 0.030% by mass greater than the phosphorus content of the iron-base particles before being covered with the phosphate-based conversion coating.