EP 1780736 A1 20070502 - R-T-B type alloy, production method of R-T-B type alloy flake, fine powder for R-T-B type rare earth permanent magnet, and R-T-B type rare earth permanent magnet
Title (en)
R-T-B type alloy, production method of R-T-B type alloy flake, fine powder for R-T-B type rare earth permanent magnet, and R-T-B type rare earth permanent magnet
Title (de)
R-T-B-Legierung, Verfahren zur Herstellung von Flocken der R-T-B-Legierung, feines Pulver für R-T-B- Seltenerd-Dauermagnete und R-T-B Seltenerd-Dauermagnete
Title (fr)
Alliage de type R-T-B, procédé de fabrication de flocons de l'alliage R-T-B, poudre fine pour aimants permenants de type R-T-B et aimants permenants de type R-T-B
Publication
Application
Priority
JP 2005316551 A 20051031
Abstract (en)
The present invention provides an R-T-B type alloy as a raw material of a rare earth-based permanent magnet having excellent magnetic characteristics. The present invention provides an R-T-B type alloy (wherein R is at least one member selected from rare earth elements including Y, T is a transition metal essentially comprising Fe, and B is boron) which is a raw material for use in a rare earth-based permanent magnet, wherein the volume percentage of the region containing an R 2 T 17 phase having an average grain diameter of 3 µm or less in the short axis direction is from 0.5 to 10%.
IPC 8 full level
B22D 11/06 (2006.01); C22C 38/00 (2006.01); H01F 1/057 (2006.01)
CPC (source: EP US)
B22D 11/0611 (2013.01 - EP US); C22C 38/002 (2013.01 - EP); C22C 38/005 (2013.01 - EP); C22C 38/06 (2013.01 - EP); C22C 38/10 (2013.01 - EP); C22C 38/20 (2013.01 - EP); H01F 1/0577 (2013.01 - EP); B22F 2009/044 (2013.01 - EP); B22F 2998/10 (2013.01 - EP); B22F 2999/00 (2013.01 - EP); H01F 41/0273 (2013.01 - EP)
Citation (search report)
- [X] EP 1033415 A1 20000906 - SHOWA DENKO KK [JP]
- [X] WO 0012771 A1 20000309 - SHOWA DENKO KK [JP], et al
- [X] US 2005098239 A1 20050512 - KUNIYOSHI FUTOSHI [JP], et al
- [X] WO 03052778 A1 20030626 - SHOWA DENKO KK [JP], et al
- [X] D. BROWN, B.-M. MA, Z. CHEN: "Developments in the processing and properties of NdFeb-type permanent magnets", JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, vol. 248, 2002, pages 432 - 440, XP002417945
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR
Designated extension state (EPC)
AL BA HR MK YU
DOCDB simple family (publication)
EP 1780736 A1 20070502; EP 1780736 B1 20121212; CN 1958824 A 20070509; CN 1958824 B 20111228; JP 2007119882 A 20070517; JP 4832856 B2 20111207
DOCDB simple family (application)
EP 06020850 A 20061004; CN 200610143106 A 20061031; JP 2005316551 A 20051031