(19)
(11) EP 0 124 655 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
10.09.1986 Bulletin 1986/37

(43) Date of publication A2:
14.11.1984 Bulletin 1984/46

(21) Application number: 83113252

(22) Date of filing: 30.12.1983
(84) Designated Contracting States:
BE CH DE FR GB IT LI NL SE

(30) Priority: 06.05.1983 JP 7909683
06.05.1983 JP 7909883

(71) Applicant: SUMITOMO SPECIAL METAL CO., LTD.
 ()

(72) Inventors:
  • Fujimura, Setsuo Hanazonodanchi 14-106
     ()
  • Sagawa, Masato
     ()
  • Matsuura, Yutaka
     ()

   


(54) Isotropic permanent magnets and process for producing same


(57) Isotropic permanent magnet formed of a sintered body having a mean crystal grain size of 1-160 microns and a major phase of tetragonal system comprising, in atomic percent, 10-25% of R wherein R represents at least one of rare-earth elements including Y, 3-23% ofB and the balance being Fe. As additional elements M, Al, Ti, V, Cr, Mn, Zr, Hf, Nb, Ta, Mo, Ge, Sb, Sn, Bi, Ni or W may be incorporated.
The magnets can be produced through a powder metallurgical process resulting in high magnetic properties, e.g., up to 7 MGOe or higher energy product.






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