EP 0633581 B1 19980422 - R-Fe-B permanent magnet materials and process of producing the same
Title (en)
R-Fe-B permanent magnet materials and process of producing the same
Title (de)
R-Fe-B Dauermagnetmaterialien und ihre Herstellungsverfahren
Title (fr)
Matériaux R-Fe-B pour aimants permanents et leurs procédé de fabrication
Publication
Application
Priority
- JP 19288693 A 19930706
- JP 20719093 A 19930728
- JP 20719193 A 19930728
- JP 20719293 A 19930728
- JP 21217193 A 19930803
Abstract (en)
[origin: EP0633581A1] It is an object of the present invention to provide R-Fe-B permanent magnet materials having a good oxidation resistance and magnetic characteristics, and a process of producing the same capable of pulverizing efficiently, whereby an R-Fe-B molten alloy having a specific composition is casted into a cast piece having a specific plate thickness and a structure, in which an R-rich phase is finely separated below 5 mu m, by a strip casting process, the cast piece is subjected to a Hydrogenation for spontaneous decay, and thereafter, an alloy powder is dehydrogenated and stabilized for pulverization so as to fractionize crystal grains of a main phase constituting an alloy ingot, thereby the powder having a uniform grain distribution can be produced at an efficiency of about twice as much as the conventional process, and the R-rich phase and an R2Fe14B phase are also fractionized at the time of pulverization, thus by magnetization by pressing after the orientation using a pulse magnetic field, a high performance R-Fe-B permanent magnet having, a good oxidation resistance and magnetic characteristics of the magnetic alloy, particularly, a total value A + B of a maximum energy product value (BH) max (MGOe); A and a characteristic value; B of a coercive force iHc(kOe) of 59 or more and the squareness of demagnetization curve {(Br<2>/4)/(BH) max} of 1.01 to 1.045 is obtained.
IPC 1-7
IPC 8 full level
H01F 1/053 (2006.01); B22F 3/04 (2006.01); B22F 3/087 (2006.01); H01F 1/057 (2006.01)
CPC (source: EP KR)
B22F 3/02 (2013.01 - EP); B22F 3/04 (2013.01 - EP); H01F 1/04 (2013.01 - KR); H01F 1/057 (2013.01 - EP); H01F 1/0573 (2013.01 - EP); H01F 1/0577 (2013.01 - EP); B22F 2202/05 (2013.01 - EP); B22F 2998/10 (2013.01 - EP); B22F 2999/00 (2013.01 - EP)
C-Set (source: EP)
Designated contracting state (EPC)
AT BE DE FR GB IT NL
DOCDB simple family (publication)
EP 0633581 A1 19950111; EP 0633581 B1 19980422; AT E165477 T1 19980515; CN 1076115 C 20011212; CN 1114779 A 19960110; DE 69318147 D1 19980528; DE 69318147 T2 19981112; KR 0131060 B1 19980424; KR 950004295 A 19950217; RU 2113742 C1 19980620; TW 272293 B 19960311
DOCDB simple family (application)
EP 93308184 A 19931014; AT 93308184 T 19931014; CN 93115008 A 19931015; DE 69318147 T 19931014; KR 930021615 A 19931015; RU 93049098 A 19931014; TW 82108554 A 19931015