EP 2869311 A1 20150506 - Method of manufacturing fully dense Nd-Fe-B magnets with enhanced coercivity and gradient microstructure
Title (en)
Method of manufacturing fully dense Nd-Fe-B magnets with enhanced coercivity and gradient microstructure
Title (de)
Verfahren zur Herstellung von völlig dichten Nd-Fe-B-Magneten mit erhöhter Koerzitivität und Gradient-Mikrostruktur
Title (fr)
Procédé de fabrication d'aimants Nd-Fe-B totalement denses à microstructure à gradient et coercivité améliorée
Publication
Application
Priority
EP 13005137 A 20131029
Abstract (en)
The present invention relates to a method of manufacturing fully dense Nd-Fe-B magnets by mixing Nd-Fe-B ribbons with a powder containing a heavy rare earth metal. The mixture comprises 1-4 wt% of the heavy rare earth metal and is in the first step spark plasma sintered to a fully dense nanocrystalline Nd-Fe-B magnet and subsequently in a second step annealed to allow the diffusion of the heavy rare earth metal. With this method an enhancement of coercivity of approximately 30 % can be achieved.
IPC 8 full level
H01F 1/057 (2006.01); H01F 41/02 (2006.01)
CPC (source: EP)
H01F 1/0571 (2013.01); H01F 1/0577 (2013.01); H01F 1/0572 (2013.01); H01F 41/0293 (2013.01)
Citation (applicant)
US 2011057756 A1 20110310 - MARINESCU MELANIA [US], et al
Citation (search report)
- [XDI] US 2011057756 A1 20110310 - MARINESCU MELANIA [US], et al
- [XA] US 2012181476 A1 20120719 - OZEKI IZUMI [JP], et al
- [XA] FANG XU ET AL: "Effect of DyFadditions on the coercivity and grain boundary structure in sintered NdFeB magnets", SCRIPTA MATERIALIA, ELSEVIER, AMSTERDAM, NL, vol. 64, no. 12, 7 March 2011 (2011-03-07), pages 1137 - 1140, XP028194671, ISSN: 1359-6462, [retrieved on 20110312], DOI: 10.1016/J.SCRIPTAMAT.2011.03.011
- [XA] XU TANG ET AL: "Mechanism Analysis of Coercivity Enhancement of Hot Deformed Nd-Fe-B Magnets by ${\rm DyF}_{3}$ Diffusion", IEEE TRANSACTIONS ON MAGNETICS, IEEE SERVICE CENTER, NEW YORK, NY, US, vol. 49, no. 7, 1 July 2013 (2013-07-01), pages 3237 - 3239, XP011520099, ISSN: 0018-9464, DOI: 10.1109/TMAG.2013.2243126
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated extension state (EPC)
BA ME
DOCDB simple family (publication)
DOCDB simple family (application)
EP 13005137 A 20131029