EP 1460650 B1 20071114 - R-T-B BASED RARE EARTH ELEMENT PERMANENT MAGNET
Title (en)
R-T-B BASED RARE EARTH ELEMENT PERMANENT MAGNET
Title (de)
SELTENERDELEMENT-PERMANENTMAGNET AUF R-T-B-BASIS
Title (fr)
AIMANT PERMANENT A ELEMENTS EN TERRES RARES EN ALLIAGE DE R-T-B
Publication
Application
Priority
- JP 0312491 W 20030930
- JP 2002287033 A 20020930
- JP 2003092890 A 20030328
Abstract (en)
[origin: EP1460651A1] A method for manufacturing an R-T-B system rare earth permanent magnet that is a sintered body comprising a main phase consisting of an R2T14B phase (wherein R represents one or more rare earth elements (providing that the rare earth elements include Y), and T represents one or more transition metal elements essentially containing Fe, or Fe and Co), and a grain boundary phase containing a higher amount of R than the above main phase, wherein a product that is rich in Zr exists in the above R2T14B phase, the above manufacturing method comprising the steps of: preparing an R-T-B alloy containing as a main component the R2T14B phase and also containing Zr, and an R-T alloy containing R and T as main components, wherein the amount of R is higher than that of the above R-T-B alloy; obtaining a mixture of the R-T-B alloy powder and the R-T alloy powder; preparing a compacted body with a certain form from the above mixture; and sintering the above compacted body, wherein, in the above sintering step, the above product is generated in the above R2T14B phase. <IMAGE>
IPC 8 full level
C22C 1/04 (2006.01); C22C 33/02 (2006.01); H01F 1/047 (2006.01); H01F 1/053 (2006.01); H01F 1/055 (2006.01); H01F 1/057 (2006.01); H01F 41/02 (2006.01)
CPC (source: EP)
C22C 33/0228 (2013.01); C22C 33/0278 (2013.01); C22C 38/005 (2013.01); C22C 38/06 (2013.01); C22C 38/14 (2013.01); H01F 1/0557 (2013.01); H01F 1/0577 (2013.01); H01F 41/0253 (2013.01); B22F 2998/10 (2013.01); C22C 2202/02 (2013.01)
Designated contracting state (EPC)
DE FR GB NL
DOCDB simple family (publication)
EP 1460651 A1 20040922; EP 1460651 A4 20050323; EP 1460651 B1 20070221; CN 100334662 C 20070829; CN 1295713 C 20070117; CN 1572005 A 20050126; CN 1572006 A 20050126; DE 60311960 D1 20070405; DE 60311960 T2 20071031; DE 60317460 D1 20071227; DE 60317460 T2 20080918; EP 1460650 A1 20040922; EP 1460650 A4 20050330; EP 1460650 B1 20071114; JP 4076178 B2 20080416; JP 4076179 B2 20080416; JP WO2004029999 A1 20060126; JP WO2004030000 A1 20060126; WO 2004029999 A1 20040408; WO 2004030000 A1 20040408
DOCDB simple family (application)
EP 03748613 A 20030930; CN 03801313 A 20030930; CN 03801314 A 20030930; DE 60311960 T 20030930; DE 60317460 T 20030930; EP 03748612 A 20030930; JP 0312491 W 20030930; JP 0312492 W 20030930; JP 2004539583 A 20030930; JP 2004539584 A 20030930