(19)
(11) EP 0 383 035 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
03.07.1991 Bulletin 1991/27

(43) Date of publication A2:
22.08.1990 Bulletin 1990/34

(21) Application number: 90100930.8

(22) Date of filing: 17.01.1990
(51) International Patent Classification (IPC)5: H01F 1/20, H01F 1/26
(84) Designated Contracting States:
DE FR GB

(30) Priority: 18.01.1989 JP 7853/89
25.12.1989 JP 335899/89

(71) Applicant: Nippon Steel Corporation
Chiyoda-ku Tokyo 100 (JP)

(72) Inventors:
  • Nishida, Tokuhiko, c/o Nippon Steel Corporation
    Kawasaki City, Kanagawa Prefecture (JP)
  • Yamamiya, Masao, c/o Nippon Steel Corporation
    Kawasaki City, Kanagawa Prefecture (JP)

(74) Representative: VOSSIUS & PARTNER 
Postfach 86 07 67
81634 München
81634 München (DE)


(56) References cited: : 
   
       


    (54) Iron-silicon alloy powder magnetic cores and method of manufacturing the same


    (57) An Fe-Si alloy powder magnetic core comprises an alloy powder of an average particle diameter of 10-100 µm, produced by water atomization, in which the composition by weight of the alloy powder is 2-12% silicon and 0.05-0.95% oxygen with the balance being essentially iron. The process of manufacturing the powder magnetic core is also disclosed.







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