Title:
POWDER MAGNETIC CORE AND IRON-BASE POWDER FOR POWDER MAGNETIC CORE
Document Type and Number:
WIPO Patent Application WO/2008/032707
Kind Code:
A1
Abstract:
This invention relates to an iron-base powder for a power magnetic core. In the iron-base powder for a powder magnetic core, when a crystal grain size distribution including at least the maximum crystal grain diameter is determined by observing at least 50 ion-base powder cross sections to measure the crystal grain diameter for each ion-base powder, not less than 70% of the measured crystal grains are accounted for by crystal grains having a crystal grain diameter of not less than 50 μm. According to the iron-base powder, the magnetic coercive force of the powder magnetic core is reduced, and the hysteresis loss can be reduced.
Inventors:
MITANI HIROYUKI
AKAGI NOBUAKI
HOUJOU HIROFUMI
ISHIHARA CHIO
IWAKIRI MAKOTO
YAMADA SOHEI
MOCHIMIZO YASUKUNI
AKAGI NOBUAKI
HOUJOU HIROFUMI
ISHIHARA CHIO
IWAKIRI MAKOTO
YAMADA SOHEI
MOCHIMIZO YASUKUNI
Application Number:
PCT/JP2007/067660
Publication Date:
March 20, 2008
Filing Date:
September 11, 2007
Export Citation:
Assignee:
KOBE STEEL LTD (JP)
HITACHI POWDERED METALS (JP)
MITANI HIROYUKI
AKAGI NOBUAKI
HOUJOU HIROFUMI
ISHIHARA CHIO
IWAKIRI MAKOTO
YAMADA SOHEI
MOCHIMIZO YASUKUNI
HITACHI POWDERED METALS (JP)
MITANI HIROYUKI
AKAGI NOBUAKI
HOUJOU HIROFUMI
ISHIHARA CHIO
IWAKIRI MAKOTO
YAMADA SOHEI
MOCHIMIZO YASUKUNI
International Classes:
B22F1/06; B22F1/102; B22F1/145; B22F1/16; B22F3/00; H01F1/20; H01F1/24
Foreign References:
| JP2003092211A | 2003-03-28 | |||
| JP2005281805A | 2005-10-13 | |||
| JP2005133168A | 2005-05-26 | |||
| JP2006202956A | 2006-08-03 | |||
| JPH062007A | 1994-01-11 | |||
| JP2002121601A | 2002-04-26 | |||
| JP2006245920A | 2006-09-14 |
Other References:
"SEI Technical Review", vol. 166, March 2005, SUMITOMO ELECTRIC INDUSTRIES, LTD., pages: 1 - 6
"Method for Determination of Sieve Analysis of Metal Powders", JPMA, 1992, pages 02
See also references of EP 2060344A4
"Method for Determination of Sieve Analysis of Metal Powders", JPMA, 1992, pages 02
See also references of EP 2060344A4
Attorney, Agent or Firm:
OGURI, Shohei et al. (7-13 Nishi-Shimbashi 1-chom, Minato-ku Tokyo 03, JP)
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