Method for preparing rare earth permanent magnet material

Details Method for preparing rare earth permanent magnet material Method for preparing rare earth permanent magnet material

2011-06-07

2011-06-07

Sheehan, John P (Department: 1793)

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

C148S101000, C148S302000

Reexamination Certificate

active

07955443

ABSTRACT:
A permanent magnet material is prepared by covering an anisotropic sintered magnet body of formula: R1x(Fe1-yCoy)100-x-z-aBzMawherein R1is a rare earth element, M is Al, Cu or the like, with a powder comprising an oxide of R2, a fluoride of R3or an oxyfluoride of R4wherein R2, R3, and R4are rare earth elements, and having an average particle size up to 100 μm, heat treating the powder-covered magnet body in a hydrogen gas-containing atmosphere for inducing disproportionation reaction on R12Fe14B compound, and continuing heat treatment at a reduced hydrogen gas partial pressure for inducing recombination reaction to said compound, thereby finely dividing said compound phase to a crystal grain size up to 1 μm, and for effecting absorption treatment, thereby causing R2, R3or R4to be absorbed in the magnet body.

REFERENCES:
patent: 4837114 (1989-06-01), Hamada et al.
patent: 4917778 (1990-04-01), Takada et al.
patent: 4942098 (1990-07-01), Hamamura et al.
patent: 4968529 (1990-11-01), Hamamura et al.
patent: 4981532 (1991-01-01), Takeshita et al.
patent: 5034146 (1991-07-01), Ohashi et al.
patent: 5194099 (1993-03-01), Esper et al.
patent: 5316595 (1994-05-01), Hamada et al.
patent: 5405455 (1995-04-01), Kusunoki et al.
patent: 5411603 (1995-05-01), Vial et al.
patent: 5580396 (1996-12-01), Fruchart et al.
patent: 5766372 (1998-06-01), Fujimura et al.
patent: 5851312 (1998-12-01), Honkura et al.
patent: 5858123 (1999-01-01), Uchida et al.
patent: 5858124 (1999-01-01), Endo et al.
patent: 6296720 (2001-10-01), Yamamoto et al.
patent: 6302939 (2001-10-01), Rabin et al.
patent: 6403024 (2002-06-01), Oota et al.
patent: 6606019 (2003-08-01), Ohashi
patent: 6960240 (2005-11-01), Hirota et al.
patent: 7053745 (2006-05-01), Yoshimura et al.
patent: 7138018 (2006-11-01), Honkura et al.
patent: 7485193 (2009-02-01), Hirota et al.
patent: 7559996 (2009-07-01), Miyata et al.
patent: 2003/0047240 (2003-03-01), Honkura et al.
patent: 2003/0079805 (2003-05-01), Hamada et al.
patent: 2004/0000359 (2004-01-01), Tayu et al.
patent: 2004/0187970 (2004-09-01), Ishizaka et al.
patent: 2006/0213582 (2006-09-01), Nakamura et al.
patent: 2006/0213583 (2006-09-01), Nakamura et al.
patent: 2006/0213584 (2006-09-01), Nakamura et al.
patent: 2006/0213585 (2006-09-01), Nakamura et al.
patent: 2006/0278517 (2006-12-01), Machida et al.
patent: 2007/0017601 (2007-01-01), Miyata et al.
patent: 2007/0034299 (2007-02-01), Machida et al.
patent: 2007/0160863 (2007-07-01), Hamada et al.
patent: 2007/0240787 (2007-10-01), Nakamura et al.
patent: 2007/0240788 (2007-10-01), Nakamura et al.
patent: 2007/0240789 (2007-10-01), Nakamura et al.
patent: 2008/0054736 (2008-03-01), Miyata et al.
patent: 2008/0223489 (2008-09-01), Nagata et al.
patent: 2008/0245442 (2008-10-01), Nakamura et al.
patent: 2008/0247896 (2008-10-01), Cooper et al.
patent: 2008/0247898 (2008-10-01), Nakamura et al.
patent: 2009/0020193 (2009-01-01), Ohta et al.
patent: 2009/0098006 (2009-04-01), Nakamura et al.
patent: 2009/0226339 (2009-09-01), Nakamura et al.
patent: 0255939 (1988-02-01), None
patent: 0 345 092 (1989-06-01), None
patent: 0633581 (1995-11-01), None
patent: 1267365 (2002-12-01), None
patent: 1643513 (2006-04-01), None
patent: 1 705 668 (2006-09-01), None
patent: 1 705 669 (2006-09-01), None
patent: 1 705 670 (2006-09-01), None
patent: 1 705 671 (2006-09-01), None
patent: 1734539 (2006-12-01), None
patent: 1746611 (2007-01-01), None
patent: 1830371 (2007-09-01), None
patent: 53-001807 (1978-01-01), None
patent: 61-195954 (1986-08-01), None
patent: 62-192566 (1987-08-01), None
patent: 62-256412 (1987-11-01), None
patent: 1-117303 (1989-05-01), None
patent: 1-155603 (1989-06-01), None
patent: 1-251704 (1989-10-01), None
patent: 3-188241 (1991-08-01), None
patent: 2904571 (1992-06-01), None
patent: 4-184901 (1992-07-01), None
patent: 4-328204 (1992-11-01), None
patent: 4-328804 (1992-11-01), None
patent: 5-021218 (1993-01-01), None
patent: 5-031807 (1993-05-01), None
patent: 6-158238 (1994-06-01), None
patent: 6-244011 (1994-09-01), None
patent: 3143156 (2001-03-01), None
patent: 2002-093610 (2002-03-01), None
patent: 2003-282312 (2003-10-01), None
patent: 3471876 (2003-12-01), None
patent: 2004-281-493 (2004-10-01), None
patent: 2004-281492 (2004-10-01), None
patent: 2004-296973 (2004-10-01), None
patent: 2004-304038 (2004-10-01), None
patent: 2005-011973 (2005-01-01), None
patent: 2005-285861 (2005-10-01), None
patent: 2006-049865 (2006-02-01), None
patent: 2007-053351 (2007-03-01), None
patent: 1 513 738 (1995-04-01), None
patent: 2 136 068 (1999-08-01), None
patent: 2004/064085 (2004-07-01), None
patent: 2004/114333 (2004-12-01), None
patent: 2005/123974 (2005-12-01), None
patent: 2006/003882 (2006-01-01), None
patent: WO 2006/043348 (2006-04-01), None
patent: 2007/119551 (2007-10-01), None
The Journal of the Institute of Electrical Engineers of Japan, vol. 124, 2004, pp. 699-702, published on Nov. 1, 2004.
Press Release (Shin-Etsu News) dated on Mar. 24, 2005.
Intermag Asia 2005; Digest of the IEEE International Magnetics Conference; p. 476; held on Apr. 4-8, 2005.
Techno-Frontier Symposium 2005; pp. B1-2-1 to B1-2-12; held on Apr. 20, 2005 by JMA.
IEEE Transactions on Magnetics, vol. 41, No. 10. Oct. 2005, pp. 3844-3846.
Abstract of Autumn Meeting of Japan Society of Powder and Powder Metallurgy, 2005; p. 143; held on Nov. 14-16, 2005.
2005 BM Symposium, Abstract of Presentation by the Japan Association of Bonded Magnet Industries held on Dec. 2, 2005.
Hajime Nakamura, “Nd-Fe-B Sintered Magnets Produced by the Grain Boundary Diffusion Process”, Bulletin of Topical Symposium of the Magnetic Society of Japan, Mar. 14, 2006, pp. 13-18.
IEEE International Magnetics Conference, May 8-12, 2006, p. 910.
Digest of the 30thAnnual Conference on Magnetics in Japan 2006, pp. 417-418.
European Search Report dated May 28, 2008, issued in corresponding European Patent Application No. 07251607.
“Shin-Etsu Chemical, develops new high-performance technology for neodymium rare-earth magnets”, Shin-Etsu News, press release in Tokyo, Mar. 24, 2005.
The Nikkan Kogyo Shimbun, reporting the press release, Mar. 25, 2005.
The Dempa Shimbun, reporting the press release, Mar. 25, 2005.
The Kagaku Kogyo Nippo, reporting the press release, Mar. 25, 2005.
The Sekiyu Kagaku Shimbun Nikkan Tsushin, reporting the press release, Mar. 25, 2005.
The Nikkan Chemical News, reporting the press release, Mar. 25, 2005.
Nikkei Net, reporting the press release, Mar. 25, 2005.
Kenichi Machida et al., “Grain Boundary Modification and Magnetic Properties of Nd-Fe-B Sintered Magnets”, Abstracts of Spring Meeting of Japan Society of Powder and Powder Metallurgy, 2004, pp. 202.
Hajime Nakamura, et al., “Microstructures of the anisotropic Nd-Fe-B HDDR treated powder,” The Papers of Technical Meeting on Magnetics, Nov. 17, 1998, pp. 31-36, Technical Meeting on Magnetics, The Institute of Electrical Engineers of Japan.
Nakamura, Hajime, “Nd-Fe-B Based Sintered Magnet Processed to Ultraminiature Size”, The Journal of the Institute of Electrical Engineers of Japan, Nov. 1, 2004, p. 699-702, vol. 124 No. 11.
K.D. Durst et al., “The Coercive Field of Sintered and Melt-Spun Nd-Fe-B Magnets”, Journal of Magnetism and Magnetic Materials, 1987, p. 63-75, vol. 68.
K. T. Park et al., “Effect of Metal-Coating and Consecutive Heat Treatment on Coercivity of Thin Nd-Fe-B Sintered Magnets”, Proceedings of the Sixteenth International Workshop on Rare-Earth Magnets and Their Applications, Sendai, 2000, p. 257-264.
Supplemental European Search Report, issued Mar. 22, 2010, for corresponding European Patent Application No. 07740024.0.
International Search Report of PCT/JP2007/056594, date of mailing Jul. 10, 2007.
International Search Report of PCT/JP2007/056586, date of mailing Jun. 19, 2007.
European Search Report dated Jun. 4, 2008, issued in corresponding European Patent Application No. 07251603.2.
European Search Report dated Jun. 26, 2008, issued in corresponding European Patent Applica

Affiliated with

Also associated with

Rating

Method for preparing rare earth permanent magnet material does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method for preparing rare earth permanent magnet material, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for preparing rare earth permanent magnet material will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2717145