EP 0468903 B1 19940209 - Method for obtaining powdered magnetic material of the rare earth-transition metal-boron type for corrosion resistant magnets.
Title (en)
Method for obtaining powdered magnetic material of the rare earth-transition metal-boron type for corrosion resistant magnets.
Title (de)
Herstellungsverfahren von Seltenerdübergangsmetall-Bortyp-Magnetpulver für korrosionsfeste Magnete.
Title (fr)
Méthode d'obtention sous forme divisée d'un matériau magnétique de type terre rare - métaux de transition bore pour des aimants résistant à la corrosion.
Publication
Application
Priority
FR 9009722 A 19900725
Abstract (en)
[origin: US5221368A] The invention relates to a method of obtaining friable and relatively inert TR Fe B type magnetic materials in divided form which lead to magnets having improved corrosion resistance. This method involves treating the material in an atmosphere containing (or capable of containing) hydrogen under the following conditions of absolute pressure (P) and of temperature (T DEG C.): if P</=Pa, 250<T<550; and if P>Pa, 250+100 log (P/Pa)<T<250+100 log (P/Pa) log base 10, Pa being atmospheric pressure. The invention is used for obtaining sintered TR Fe B magnets having improved corrosion resistance.
IPC 1-7
IPC 8 full level
C22C 33/02 (2006.01); B22F 9/02 (2006.01); C22C 38/00 (2006.01); H01F 1/053 (2006.01); H01F 1/057 (2006.01); H01F 1/06 (2006.01)
CPC (source: EP US)
B22F 9/023 (2013.01 - EP US); H01F 1/0573 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE CH DE ES FR GB IT LI NL SE
DOCDB simple family (publication)
EP 0468903 A1 19920129; EP 0468903 B1 19940209; AT E101451 T1 19940215; CA 2046478 A1 19920126; DE 69101155 D1 19940324; DE 69101155 T2 19940601; ES 2050519 T3 19940516; FI 107303 B 20010629; FI 913546 A0 19910724; FI 913546 A 19920126; FR 2665295 A1 19920131; FR 2665295 B1 19940916; HK 39195 A 19950324; IE 66827 B1 19960207; IE 912607 A1 19920129; JP 2933293 B2 19990809; JP H06120015 A 19940428; SG 29795 G 19950818; US 5221368 A 19930622
DOCDB simple family (application)
EP 91420269 A 19910723; AT 91420269 T 19910723; CA 2046478 A 19910708; DE 69101155 T 19910723; ES 91420269 T 19910723; FI 913546 A 19910724; FR 9009722 A 19900725; HK 39195 A 19950316; IE 260791 A 19910724; JP 18657991 A 19910725; SG 29795 A 19950220; US 73589391 A 19910725