EP 0338597 B1 19950111 - Permanent magnets.
Title (en)
Permanent magnets.
Title (de)
Dauermagnete.
Title (fr)
Aimants permanents.
Publication
Application
Priority
- EP 85102200 A 19850227
- JP 3692384 A 19840228
- JP 3692484 A 19840228
- JP 3692584 A 19840228
- JP 3692684 A 19840228
Abstract (en)
[origin: EP0338597A2] Permanent magnet materials, produced according to the following steps: forming an alloy powder having a mean particle size of 0.3-80 mu m and composed of, in atomic percentage, 8-30 % R (provided that R is at least one of rare earth elements including Y), 2-28 % B, and the balance Fe and inevitable impurities, sintering the formed body at a temperature of 900-1200 DEG C, subjecting the sintered body to a primary heat treatment at a temperature of 750-1000 DEG C, then cooling the resultant body to a temperature of no higher than 680 DEG C at a cooling rate of 3-2000 DEG C/min, and further subjecting the thus cooled body to a secondary heat treatment at a temperature of 480-700 DEG C. Magnets having an energy product (BH)max of at least 20 MGOe and a coercitive force (iHc) of at least 10 kOe or magnets having an energy product (BH)max of 40 MGOe or more can be obtained by specific compositions.
IPC 1-7
IPC 8 full level
B22F 3/24 (2006.01); C22C 1/04 (2006.01); H01F 1/057 (2006.01)
CPC (source: EP)
B22F 3/24 (2013.01); C22C 1/0441 (2013.01); H01F 1/0577 (2013.01)
Designated contracting state (EPC)
BE CH DE FR GB IT LI NL SE
DOCDB simple family (publication)
EP 0338597 A2 19891025; EP 0338597 A3 19911113; EP 0338597 B1 19950111
DOCDB simple family (application)
EP 89111005 A 19850227