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1. (WO2015045561) DUST CORE, METHOD FOR PRODUCING DUST CORE AND COIL COMPONENT

Pub. No.:    WO/2015/045561    International Application No.:    PCT/JP2014/068384
Publication Date: Fri Apr 03 01:59:59 CEST 2015 International Filing Date: Fri Jul 11 01:59:59 CEST 2014
IPC: H01F 1/24
B22F 1/00
B22F 1/02
B22F 3/00
B22F 3/24
C22C 33/02
H01F 27/255
H01F 41/02
Applicants: SUMITOMO ELECTRIC INDUSTRIES,LTD.
住友電気工業株式会社
SUMITOMO ELECTRIC SINTERED ALLOY, LTD.
住友電工焼結合金株式会社
Inventors: UENO, Tomoyuki
上野 友之
WATANABE, Asako
渡▲辺▼ 麻子
UOZUMI, Masato
魚住 真人
Title: DUST CORE, METHOD FOR PRODUCING DUST CORE AND COIL COMPONENT
Abstract:
A dust core that contains a coated iron powder, each particle of which has an insulating coating, and an aliphatic lubricant. The coated iron powder has an average particle diameter of from 200 μm to 450 μm (inclusive), and the ratio of powder particles having a particle diameter of 75 μm or less is 10% by mass or less. The content of the aliphatic lubricant is from 0.0045% by mass to 0.02% by mass (inclusive). A method for producing a dust core, wherein a mixed powder containing a coated iron powder, which has an average particle diameter of from 200 μm to 450 μm (inclusive) and contains powder particles having a particle diameter of 75 μm or less at a ratio of 10% by mass or less, and from 0.2% by mass to 0.5% by mass (inclusive) of an aliphatic lubricant is filled into a mold and is pressurized and compressed so as to produce a compressed product that contains from 0.135% by mass to 0.485% by mass (inclusive) of the aliphatic lubricant, and then the compressed product is subjected to a heat treatment, thereby producing a dust core that contains from 0.0045% by mass to 0.02% by mass (inclusive) of the aliphatic lubricant.