EP 1032940 A1 20000906 - METHOD FOR PRODUCING A MAGNETIC ALLOY POWDER
Title (en)
METHOD FOR PRODUCING A MAGNETIC ALLOY POWDER
Title (de)
VERFAHREN ZUR HERSTELLUNG EINES MAGNETLEGIERUNGSPULVERS
Title (fr)
PROCEDE POUR PRODUIRE UNE POUDRE D'ALLIAGE MAGNETIQUE
Publication
Application
Priority
- DE 19751366 A 19971120
- DE 19751367 A 19971120
- EP 9807418 W 19981119
Abstract (en)
[origin: US6352597B1] A method is disclosed enabling a technologically controllable and economical production of a hard-magnetic powder composed of a samarium-cobalt base alloy for highly coercive permanent magnets. The method is based on a HDDR treatment in which a starting powder is subjected to hydrogenation with disproportionation of the alloy in a first method step under hydrogen and, in a subsequent, second method step under vacuum conditions, a hydrogen desorption with recombination of the alloy. A starting powder containing samarium and cobalt is treated in the first method step either at a high temperature in the range of 500° C. to 900° C. and with a high hydrogen pressure of >0.5 MPa or by applying an intensive fine grinding at a low temperature in the range of 50° C. to 500° C. and with a hydrogen pressure of >0.15 MPa. By means of the method of the invention, magnetic alloy powders can be produced from samarium-cobalt base alloys; highly coercive permanent magnets can be produced from these magnetic alloy powders, particularly by hot compacting or plastic bonding.
IPC 1-7
IPC 8 full level
B22F 9/00 (2006.01); B22F 9/02 (2006.01); B22F 9/04 (2006.01); C22C 33/02 (2006.01); H01F 1/055 (2006.01); H01F 1/06 (2006.01)
CPC (source: EP US)
B22F 9/023 (2013.01 - EP US); B22F 9/04 (2013.01 - EP US); H01F 1/0553 (2013.01 - EP US); B22F 2999/00 (2013.01 - EP US)
Citation (search report)
See references of WO 9927544A1
Designated contracting state (EPC)
CH DE DK FI FR GB LI SE
DOCDB simple family (publication)
US 6352597 B1 20020305; DE 59801474 D1 20011018; EP 1032940 A1 20000906; EP 1032940 B1 20010912; JP 2001524604 A 20011204; WO 9927544 A1 19990603
DOCDB simple family (application)
US 55484100 A 20000714; DE 59801474 T 19981119; EP 9807418 W 19981119; EP 98956933 A 19981119; JP 2000522596 A 19981119