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Title:
POWDER-COMPACT MAGNETIC CORE, PRODUCING METHOD THEREOF, AND COIL PART
Document Type and Number:
Japanese Patent JP2015070077
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide: a powder-compact magnetic core low in core loss; a method for producing such a powder-compact magnetic core; and a coil part including such a powder-compact magnetic core.SOLUTION: A powder-compact magnetic core comprises: coated iron powder with an insulation coating; and an aliphatic lubricant. The coated iron powder has an average particle diameter of 200-450 μm; in the coated iron powder, the percentage of powder particles having particle diameters of 75 μm or less is 10 mass% or less. In the powder-compact magnetic core, the content of the aliphatic lubricant is 0.0045-0.02 mass%. A method for producing a powder-compact magnetic core comprises the steps of: filling, in a mold, a powder mixture including coated iron powder having an average particle diameter of 200-450 μm, in which the percentage of powder particles having particle diameters of 75 μm or less is 10 mass% or less, and 0.2-0.5 mass% of an aliphatic lubricant; then, compacting with pressure the powder mixture in the mold to produce a compact including 0.135-0.485 mass% of the aliphatic lubricant; and performing a thermal treatment on the compact, whereby the powder-compact magnetic core including 0.0045-0.02 mass% of the aliphatic lubricant is produced.

Inventors:
UENO TOMOYUKI
WATANABE ASAKO
UOZUMI MASATO
Application Number:
JP2013202299A
Publication Date:
April 13, 2015
Filing Date:
September 27, 2013
Export Citation:
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Assignee:
SUMITOMO ELECTRIC INDUSTRIES
SUMITOMO DENKO SHOKETSU GOKIN
International Classes:
H01F1/24; B22F1/052; B22F1/102; B22F3/00; B22F3/24; C22C33/02; H01F27/255; H01F41/02
Domestic Patent References:
JP2010251696A2010-11-04
JP2007535134A2007-11-29
Attorney, Agent or Firm:
Hiroshi Yamano