Title:
IRON POWDER FOR DUST CORE
Document Type and Number:
WIPO Patent Application WO/2014/171065
Kind Code:
A1
Abstract:
According to the present invention, an iron powder which is to be used for the production of a dust core and which exhibits a low hysteresis loss even after molding and stress relief annealing can be obtained by adjusting the apparent density of an iron powder for a dust core to 3.8g/cm3 or more, the mean particle diameter (D50) of the iron powder to 80μm or more, the grain diameters in the insides of at least 60% of the particles which constitute the iron powder and which are 100μm or more in diameter to 80μm or more, the area fraction of inclusions in the iron powder to 0.4% or less relative to the area of the matrix of the powder, and the micro Vickers hardness (test force: 0.245N) in the cross section of the iron powder to 90Hv or less.
Inventors:
TAKASHITA TAKUYA (JP)
NAKAMURA NAOMICHI (JP)
NAKAMURA NAOMICHI (JP)
Application Number:
PCT/JP2014/001559
Publication Date:
October 23, 2014
Filing Date:
March 18, 2014
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
B22F1/05; C22C38/00; H01F1/24
Foreign References:
| JP2006024869A | 2006-01-26 | |||
| JP2006283166A | 2006-10-19 | |||
| JP2007092162A | 2007-04-12 | |||
| JP2005187918A | 2005-07-14 | |||
| JP2010043361A | 2010-02-25 | |||
| JP2005248274A | 2005-09-15 | |||
| JP2012140679A | 2012-07-26 | |||
| JP2008277775A | 2008-11-13 |
Attorney, Agent or Firm:
SUGIMURA, KENJI (JP)
Kenji Sugimura (JP)
Kenji Sugimura (JP)
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