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US 4,597,938 AGranted
Process for producing permanent magnet materials
AssigneeSumitomo Special Metals Co., Ltd.
InventorsYutaka Matsuura, Masato Sagawa, Setsuo Fujimura
Life of this patent
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Abstract
Permanent magnet materials of the Fe-B-R type are produced by: preparing a metallic powder having a mean particle size of 0.3-80 microns and a composition of 8-30 at % R, 2-28 at % B, and the balance Fe, compacting, and sintering, at a temperature of 900-1200 degrees C. Co up to 50 at % may be present. Additional elements M (Ti, Ni, Bi, V, Nb, Ta, Cr, Mo, W, Mn, Al, Sb, Ge, Sn, Zr, Hf) may be present. The process is applicable for anisotropic and isotropic magnet materials.
Claims32
A process for producing permanent magnet materials of the Fe-B-R type comprising:
- preparing a metallic powder having a mean particle size of 0.3-80 microns and a composition consisting essentially of by atomic percent, 12-24% R wherein R is at least one rare earth element selected from the group consisting of Nd, Pr, La, Ce, Tb, Dy, Ho, Er, Eu, Sm, Gd, Pm, Tm, Yb, Lu and Y and at least 50% of R consists of Nd and/or Pr, 4-24 % B, and at least 52% Fe,
- compacting said metallic powder, and
- sintering the resultant body at a temperature of 900-1200 degrees C. in a nonoxidizing or reducing atmosphere.
Dependencies are inferred from the claim text.