EP 0601943 B1 19980520 - R-Fe-B type magnet powder, sintered magnets therefrom and preparation process
Title (en)
R-Fe-B type magnet powder, sintered magnets therefrom and preparation process
Title (de)
Magnetpulver vom Typ SE-Fe-B, Sintermagnete daraus und Herstellungsverfahren
Title (fr)
Poudre magnétique de type Fe-TR-B et aimants frittés correspondants et leur méthode de préparation
Publication
Application
Priority
- FR 9214995 A 19921208
- FR 9308586 A 19930707
Abstract (en)
[origin: EP0601943A1] The magnetic powder employed for the manufacture of sintered magnets of the RE-T-B class, where RE denotes at least one rare earth, T at least one transition element and B boron, consists of the mixture of 2 powders (A) and (B): a) the powder (A) consisting of grains of RE2T14B tetrahedral structure, T being essentially iron with Co/Fe < 8 % being also capable of containing up to 0.5 % Al, up to 0.05 % Cu and up to 4 % in all of at least one element from the group consisting of V, Nb, Hf, Mo, Cr, Ti, Zr, Ta, W and of the unavoidable impurities, with a Fisher particle size of between 3.5 and 5 mu m; b) the powder (B) being rich in RE and containing Co, having the following composition by weight: RE 52-70 %, including at least 40 % (in absolute value) of one (or more) light rare earth(s) chosen from the group consisting of La, Ce, Pr, Nd, Sm and Eu; Co 20-35 %; Fe 0-20 %; B 0-0.2 %; Al 0.1-4 %; and unavoidable impurities, with a Fisher particle size of between 2.5 and 3.5 mu m. The powder (B) may be obtained by mixing a RE-rich powder (C) containing Co with a B-rich powder (D). <IMAGE>
IPC 1-7
IPC 8 full level
C22C 33/02 (2006.01); C22C 1/04 (2006.01); C22C 38/00 (2006.01); H01F 1/053 (2006.01); H01F 1/057 (2006.01); H01F 1/06 (2006.01); H01F 1/08 (2006.01)
IPC 8 main group level
B22F 3/00 (2006.01); C01F 1/00 (2006.01); C04B 35/00 (2006.01); H01F 41/00 (2006.01)
CPC (source: EP US)
C22C 1/0441 (2013.01 - EP US); H01F 1/0571 (2013.01 - EP US); H01F 1/0573 (2013.01 - EP US); H01F 1/0577 (2013.01 - EP US)
Citation (examination)
EP 0447567 A1 19910925 - KAWASAKI STEEL CO [JP]
Designated contracting state (EPC)
AT BE CH DE ES FR GB IE IT LI NL SE
DOCDB simple family (publication)
EP 0601943 A1 19940615; EP 0601943 B1 19980520; AT E166488 T1 19980615; CA 2110846 A1 19940609; DE 69318682 D1 19980625; DE 69318682 T2 19981126; ES 2117117 T3 19980801; FI 113209 B 20040315; FI 935472 A0 19931207; FI 935472 A 19940609; JP 3594326 B2 20041124; JP H06231916 A 19940819; SI 9300639 A 19940630; US 5482575 A 19960109
DOCDB simple family (application)
EP 93420483 A 19931207; AT 93420483 T 19931207; CA 2110846 A 19931207; DE 69318682 T 19931207; ES 93420483 T 19931207; FI 935472 A 19931207; JP 30808493 A 19931208; SI 9300639 A 19931208; US 16065293 A 19931202