SOFT MAGNETIC MATERIAL AND METHOD FOR PRODUCING SAME

Title:

SOFT MAGNETIC MATERIAL AND METHOD FOR PRODUCING SAME

Document Type and Number:

WIPO Patent Application WO/2005/024859

Kind Code:

A1

Abstract:

Disclosed are a soft magnetic material having an optimum electrical resistivity and a method for producing such a soft magnetic material. The soft magnetic material comprises a plurality of composite magnetic particles (30). Each of the composite magnetic particles (30) comprises a metal magnetic particle (10) and an insulating coating film (20) which covers the surface of the metal magnetic particle (10) and contains at least one substance selected from the group consisting of zirconium oxide, aluminum oxide and silicon oxide. The soft magnetic material has an electrical resistivity of not less than 3,000 μ&ohm cm and not more than 50,000 μ&ohm cm, and a magnetic permeability μ of not less than 2,000 and not more than 4,000. A method for producing such a soft magnetic material comprises a step for forming a shaped body by compressing a plurality of the composite magnetic particles (30) and a step for subjecting the shaped body to a first heat treatment at not less than 400&ring C and not more than 900&ring C.

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Inventors:

TOYODA HARUHISA (JP)
MIZUTANI RYOJI (JP)

Application Number:

PCT/JP2004/012846

Publication Date:

March 17, 2005

Filing Date:

September 03, 2004

Export Citation:

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Assignee:

SUMITOMO ELECTRIC INDUSTRIES (JP)
TOYOTA MOTOR CO LTD (JP)
TOYODA HARUHISA (JP)
MIZUTANI RYOJI (JP)

International Classes:

B22F1/16; B22F3/00; H01F1/33; H01F41/02; (IPC1-7): H01F1/33; H01F1/24; H01F41/02; B22F3/10

Foreign References:

JP2003037018A	2003-02-07
JPH0867941A	1996-03-12

Attorney, Agent or Firm:

Fukami, Hisao (Mitsui Sumitomo Bank Minamimorimachi Bldg. 1-29, Minamimorimachi 2-chome, Kita-ku, Osaka-sh, Osaka 54, JP)

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