EP 1460650 A4 20050330 - 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 DES 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 1-7
IPC 8 full level
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)
Citation (search report)
- [X] EP 1164599 A2 20011219 - SHINETSU CHEMICAL CO [JP]
- [A] EP 0302395 A1 19890208 - TDK CORP [JP]
- [A] EP 0242187 A1 19871021 - TDK CORP [JP]
- [A] EP 1014392 A2 20000628 - SHINETSU CHEMICAL CO [JP]
- [A] US 4895607 A 19900123 - YANG CHOONG-JIN [US], et al
- [X] KIM A S ET AL: "MICROSTRUCTURE OF ZR CONTAINING NDFEB", IEEE TRANSACTIONS ON MAGNETICS, IEEE INC. NEW YORK, US, vol. 33, no. 5, PART 2, September 1997 (1997-09-01), pages 3823 - 3825, XP000703229, ISSN: 0018-9464
- [X] POLLARD R J ET AL: "EFFECT OF ZR ADDITIONS ON THE MICROSTRUCTURAL AND MAGNETIC PROPERTIES OF NDFEB BASED MAGNETS", IEEE TRANSACTIONS ON MAGNETICS, IEEE INC. NEW YORK, US, vol. 24, no. 2, 1 March 1988 (1988-03-01), pages 1626 - 1628, XP000174162, ISSN: 0018-9464
- [X] BESENICAR S: "THE INFLUENCE OF ZRO2 ADDITION ON THE MICROSTRUCTURE AND THE MAGNETIC PROPERTIES OF ND-DY-FE-B MAGNETS", JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, ELSEVIER SCIENCE PUBLISHERS, AMSTERDAM, NL, vol. 104 - 107, no. PART 2, 1 February 1992 (1992-02-01), pages 1175 - 1178, XP000329968, ISSN: 0304-8853
- [A] PATENT ABSTRACTS OF JAPAN vol. 1998, no. 14 31 December 1998 (1998-12-31)
- [A] PATENT ABSTRACTS OF JAPAN vol. 1998, no. 06 30 April 1998 (1998-04-30)
- See references of WO 2004029999A1
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