Title:
SOFT-MAGNETIC IRON COMPOSITE POWDER FOR PRODUCING SOFT-MAGNETIC COMPOSITE MATERIAL WITH HIGH RESISTIVITY AND LOW IRON LOSS
Document Type and Number:
WIPO Patent Application WO/2008/041588
Kind Code:
A1
Abstract:
A soft-magnetic iron composite powder for use in producing a soft-magnetic composite
material having a high resistivity and a low iron loss, the powder comprising
a soft-magnetic iron powder and an insulating coating film formed on the surface
of the powder by the deposition of a magnesium-containing oxide. When the average
particle diameter and the BET value of the soft-magnetic iron powder are expressed
by D150 and BET1, respectively, then the soft-magnetic iron powder
satisfies the requirements that D150 is 50-300 µm and BET1 D150
is 1.81-2.65. A powder collected by sieving the soft-magnetic iron powder with
a sieve having a mesh value which is 1/2 the D150 satisfies the requirement
BET2 D250 = 1.50-2.00, wherein D250 and BET2 are the average
particle diameter and the BET value of the powder, respectively. Furthermore,
the soft-magnetic iron powder has a roundness of 0.840-0.875 and a ruggedness
of 0.940-0.948.
Inventors:
UOZUMI GAKUJI (JP)
WATANABE MUNEAKI (JP)
ISHIYAMA KOUICHI (JP)
TANAKA HIROSHI (JP)
IGARASHI KAZUNORI (JP)
MORIMOTO KOICHIRO (JP)
WATANABE MUNEAKI (JP)
ISHIYAMA KOUICHI (JP)
TANAKA HIROSHI (JP)
IGARASHI KAZUNORI (JP)
MORIMOTO KOICHIRO (JP)
Application Number:
PCT/JP2007/068700
Publication Date:
April 10, 2008
Filing Date:
September 26, 2007
Export Citation:
Assignee:
MITSUBISHI MATERIALS CORP (JP)
MITSUBISHI MATERIALS PMG CORP (JP)
UOZUMI GAKUJI (JP)
WATANABE MUNEAKI (JP)
ISHIYAMA KOUICHI (JP)
TANAKA HIROSHI (JP)
IGARASHI KAZUNORI (JP)
MORIMOTO KOICHIRO (JP)
MITSUBISHI MATERIALS PMG CORP (JP)
UOZUMI GAKUJI (JP)
WATANABE MUNEAKI (JP)
ISHIYAMA KOUICHI (JP)
TANAKA HIROSHI (JP)
IGARASHI KAZUNORI (JP)
MORIMOTO KOICHIRO (JP)
International Classes:
B22F1/16; C22C38/00; H01F1/24; H01F1/33
Foreign References:
JP2002317204A | 2002-10-31 | |||
JP2005232535A | 2005-09-02 | |||
JP2001303111A | 2001-10-31 |
Attorney, Agent or Firm:
SHIGA, Masatake et al. (Yaesu Chuo-k, Tokyo 53, JP)
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