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Title:
METHOD FOR PRODUCING Fe-Si BASED SOFT MAGNETISM SINTERED ALLOY HAVING HIGH DENSITY AND HIGH PERMEABILITY
Document Type and Number:
Japanese Patent JP2004014614
Kind Code:
A
Abstract:

To provide a method for producing an Fe-Si based composite soft magnetic sintered alloy having high density and mechanical strength and exhibiting a high relative permeability at high frequency.

Fe-Si based soft magnetic alloy powder has a first peak centering D1=30-200μm and a second peak centering D2=0.05-0.5×D1μm, in the particle size distribution. The first peak has a larger particle size distribution than that of the second peak, and is coated with a ferrite layer having spinel structure. 1-10 mass% of pure iron powder has a peak centering D3=0.05-0.5×D1μm in the particle size distribution or pure iron powder coated with a ferrite layer having spinel structure. 0.05-1.0 mass% of silicon dioxide powder has mean particle size not larger than 100nm. The above elements are mixed to constitute a composite soft magnetic powder of 100 mass% and then the mixture powder is compacted and sintered.


Inventors:
Sone, Yoshinori
Igarashi, Kazunori
Nakayama, Ryoji
Morimoto, Koichiro
Application Number:
JP2002000162892
Publication Date:
January 15, 2004
Filing Date:
June 04, 2002
Export Citation:
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Assignee:
MITSUBISHI MATERIALS CORP
International Classes:
B22F1/00; B22F1/02; C22C38/00; H01F1/24; (IPC1-7): H01F1/24; B22F1/00; B22F1/02; C22C38/00
Attorney, Agent or Firm:
富田 和夫
鴨井 久太郎