COMPOSITE SOFT MAGNETIC SINTERED MATERIAL HAVING HIGH DENSITY AND HIGH MAGNETIC PERMEABILITY, AND MANUFACTURING METHOD THEREFOR

Japanese Patent JP3946073

B2

PROBLEM TO BE SOLVED: To provide a composite soft magnetic sintered material which has high density, excellent mechanical strengths and high relative magnetic permeability of high-frequency.
SOLUTION: SiO2 powder having ≤100 nm average grain size in an amount of 0.05 to 1.0 mass% is added to composite soft magnetic powder in which a ferrite layer having spinel structure covers the surfaces of iron powder, Fe-Si series iron-based soft magnetic alloy powder, Fe-Al series iron-based soft magnetic alloy powder, Fe-Si-Al series iron-based soft magnetic alloy powder, Fe-Cr series iron-based soft magnetic alloy powder or Ni-based soft magnetic alloy powder (hereinafter they are referred to as metal soft magnetic powder) then the mixture is blended, is green compact molded and is sintered. Otherwise ≥2 kinds of composite soft magnetic powder in which the surfaces of the metal soft magnetic powder are covered with a ferrite layer haivng spinel structure of mutually different components and compositions, are blended and then the mixture is green compact molded and is sintered. The composite soft magnetic sintered material manufactured by either of these methods is provided.

Kazunori Igarashi
Ryoji Nakayama
Koichiro Morimoto
Muneaki Watanabe

JP2002099678A

July 18, 2007

April 02, 2002

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Mitsubishi Materials pmg Co., Ltd.

C22C33/02; B22F3/00; C22C38/00; H01F1/33; (IPC1-7): C22C33/02; B22F3/00; C22C38/00; H01F1/33

JP9176779A
JP9180924A
JP2225322A
JP56038402A

Kazuo Tomita
Kutaro Kamoi
Kageyama Shuichi

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