Fe-Re-B type magnetic powder, sintered magnets and preparation m

Details Fe-Re-B type magnetic powder, sintered magnets and preparation m Fe-Re-B type magnetic powder, sintered magnets and preparation m

1993-12-02

1996-01-09

Sheehan, John

Metal treatment

Stock

Magnetic

75244, H01F 1057

Patent

active

054825750

ABSTRACT:
A magnetic powder for the manufacture of sintered magnets of the RE-T-B family, where RE represents at least one rare earth, T represents at least one transition element and B represents boron, the powder possibly containing other minor elements, is constituted by a mixture of two powders (A) and (B):
a) Powder (A) consists of grains with a quadratic structure RE.sub.2 T.sub.14 B, T being mainly iron with Co/Fe<8%, and which may possibly contain up to 0.5% Al, up to 0.05% Cu and up to 4% in total of at least one element of the group V, Nb, Hf, Mo, Cr, Ti, Zr, Ta, W and unavoidable impurities, the Fisher granulometry being between 3.5 and 5 .mu.m;
b) Powder (B) is rich in RE, contains Co, and has the following composition by weight:
RE 52-70%, comprising at least 40% (absolute value) of one or more light rare earth(s) selected from the group La, Ce, Pr, Nd, Sm, Eu; a hydrogen content (in ppm by weight) greater than 130.times.%RE; Co 20-35%; Fe 0-20%; B.ltoreq.0-0.2%; Al 0.1-4%; and unavoidable impurities, the powder having a Fisher granulometry of between 2.5 and 3.5 .mu.m.
Powder (B) may be produced by mixing a RE rich powder (C) which contains Co with a B rich powder (D).

REFERENCES:
patent: 4995905 (1991-02-01), Sugawa
patent: 5123974 (1992-06-01), Tenaud et al.
patent: 5200001 (1993-04-01), Hirosawa et al.
Patent Abstracts of Japan, vol. 13, No. 246, (E-769)(3594) Jun. 8, 1989, JP-10 48 403.
Patent Abstracts of Japan, vol. 17, No.015 (E-1305) Jan. 12, 1993, JP-42 45 403.
Patent Abstracts of Japan, vol. 16, No.353 (M-1288) Jul. 30, 1992, JP-41 10 401.
Patent Abstracts of Japan, vol. 16, No. 375 (C-0973) Aug. 12, 1992, JP-41 20 238.

Affiliated with

Also associated with

Rating

Fe-Re-B type magnetic powder, sintered magnets and preparation m does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Fe-Re-B type magnetic powder, sintered magnets and preparation m, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Fe-Re-B type magnetic powder, sintered magnets and preparation m will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1300221