Metal treatment – Process of modifying or maintaining internal physical... – Magnetic materials
Reexamination Certificate
2007-08-14
2007-08-14
Sheehan, John P. (Department: 1742)
Metal treatment
Process of modifying or maintaining internal physical...
Magnetic materials
C148S103000, C148S302000
Reexamination Certificate
active
10675797
ABSTRACT:
When an R-T-B system rare earth permanent magnet is obtained by a mixing method to obtain a sintered body with a composition consisting essentially of 25% to 35% by weight of R (wherein R represents one or more rare earth elements, providing that the rare earth elements include Y), 0.5% to 4.5% by weight of B, 0.02% to 0.6% by weight of Al and/or Cu, 0.03% to 0.25% by weight of Zr, 4% or less by weight (excluding 0) of Co, and the balance substantially being Fe, wherein a coefficient of variation (CV) showing the dispersion of Zr is 130 or lower, Zr is contained in a low R alloy. This sintered body enables to inhibit the grain growth, while keeping the decrease of magnetic properties to a minimum, and to improve the suitable sintering temperature range.
REFERENCES:
patent: 4836868 (1989-06-01), Yajima et al.
patent: 4895607 (1990-01-01), Yang et al.
patent: 5595608 (1997-01-01), Takebuchi et al.
patent: 5858123 (1999-01-01), Uchida et al.
patent: 6296720 (2001-10-01), Yamamoto et al.
patent: 6444048 (2002-09-01), Hasegawa et al.
patent: 6468365 (2002-10-01), Uchida et al.
patent: 6506265 (2003-01-01), Yamamoto et al.
patent: 2002/0007875 (2002-01-01), Yamamoto et al.
patent: 2004/0079449 (2004-04-01), Kanekiyo et al.
patent: 2004/0187962 (2004-09-01), Ishizaka et al.
patent: 1258082 (2000-06-01), None
patent: 0 197 712 (1986-10-01), None
patent: 1 014 392 (2000-06-01), None
patent: 1 164 599 (2001-12-01), None
patent: 1 164 599 (2001-12-01), None
patent: 01-219143 (1989-09-01), None
patent: 10-041113 (1998-02-01), None
patent: 10-259459 (1998-09-01), None
patent: 2000-234151 (2000-08-01), None
patent: 2002-075717 (2002-03-01), None
Hirosawa, et al., “Effects of CU-NB/ZR Additions on Magnetic Properties of FE3B/(ND-DY)2FE14B Nanocomposite Magnetics”, IEEE Transactions on Magnetics, IEEE Inc., New York, U.S., vol. 37, No. 4, part 1, Jul. 2001, pp. 2558-2560.
McGuiness, et al., “Magnetic Properties and Microstructure in NdDyFeBZr-HDDR”, Journal of Magnetism and Magnetic Materials, Elsevier Science Publishers, Amsterdam, NL, vol. 188, No. 1-2, Sep. 15, 1998, pp. 119-124.
Kim, et al., “Microstructure of ZR Containing NDFEB”, IEEE Transactions On Magnetics, IEEE Inc., New York, U.S., vol. 33, No. 5, Part 2, Sep. 1997, pp. 3823-3825.
Fukuno Akira
Hidaka Tetsuya
Ishizaka Chikara
Nishizawa Gouichi
Sheehan John P.
TDK Corporation
LandOfFree
Method for manufacturing R-T-B system rare earth permanent... 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 manufacturing R-T-B system rare earth permanent..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for manufacturing R-T-B system rare earth permanent... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3895672