Metal treatment – Stock – Magnetic
Reexamination Certificate
2005-12-27
2005-12-27
Sheehan, John P. (Department: 1742)
Metal treatment
Stock
Magnetic
C420S083000, C420S121000
Reexamination Certificate
active
06979374
ABSTRACT:
Disclosed herein is a magnetic powder which can provide magnets having excellent magnetic properties and having excellent reliability especially excellent heat stability. The magnetic powder is composed of an alloy composition represented by Rx(Fe1-aCoa)100-x-y-zByMz(where R is at least one kind of rare-earth element excepting Dy, M is at least one kind of element selected from Ti, Cr, Nb, Mo, Hf, W, Mn, Zr and Dy, x is 7.1-9.9 at %, y is 4.6-8.0 at %, z is 0.1-3.0 at %, and a is 0-0.30, and the magnetic powder being constituted from a composite structure having a soft magnetic phase and a hard magnetic phase, wherein when the magnetic powder is mixed with a binding resin and then the mixture is subjected to compaction molding to form a bonded magnet having a density ρ[Mg/m3], the maximum magnetic energy product (BH)max[kJ/m3] of the bonded magnet at a room temperature satisfies the relationship represented by the formula (BH)max/ρ2[×10−9Jm3/g2] 2.40, and the intrinsic coercive force HCJof the bonded magnet at a room temperature is in the range of 400-750 kA/m.
REFERENCES:
patent: 4684406 (1987-08-01), Matsuura et al.
patent: 4765848 (1988-08-01), Mohri et al.
patent: 4792368 (1988-12-01), Sagawa et al.
patent: 4836868 (1989-06-01), Yajima et al.
patent: 5716462 (1998-02-01), Sakurada et al.
patent: 5725792 (1998-03-01), Panchanathan
patent: 5872501 (1999-02-01), Hamano et al.
patent: 6352599 (2002-03-01), Chang et al.
patent: 6527875 (2003-03-01), Arai et al.
patent: 6551418 (2003-04-01), Arai et al.
patent: 6558482 (2003-05-01), Arai et al.
patent: 0 302 395 (1989-02-01), None
patent: 1 15 127 (2001-07-01), None
patent: 1 115 126 (2001-07-01), None
patent: 1 162 634 (2001-12-01), None
patent: 01205403 (1989-08-01), None
patent: 01-205403 (1989-08-01), None
patent: 3-196502 (1991-08-01), None
patent: 3-236202 (1991-10-01), None
patent: 6-231926 (1994-08-01), None
patent: 08335506 (1996-12-01), None
patent: 10-53844 (1998-02-01), None
patent: 10-177911 (1998-06-01), None
patent: 10-265915 (1998-10-01), None
patent: 63-292601 (1998-11-01), None
patent: 11-288807 (1999-10-01), None
patent: 2001-035712 (2001-02-01), None
Wang, Z. et al, “High-coercivity (NdDy)2(FeNb)14B-ALPHA-Fe nanocrystalline alloys”, Journal of Applied Physics, American Institute of Physics, New York, US, vol. 81, No. 8, PART 2B, Apr. 15, 1997, pp. 5097-5099.
European Patent Office Search Report.
Goll, D. et al, Journal of Magnetism and Magnetic Materials, “Magnetic and Microstructural Properties of Nanocrystalline Exchange Coupled PrFeB Permanent Magnets”, 185 (1998) pp. 49-60.
Change, W.C. et al, “Magnetic Properties Enhancement of Alpha-Fe/Nd2Fe14B-Type Nanocomposites by Co Substitution”, Journal of Applied Physics, American Institute of Physics, New York, vol. 83, No. 4, Feb. 1998, pps. 2147-2151.
Arai Akira
Kato Hiroshi
Harness & Dickey & Pierce P.L.C.
Seiko Epson Corporation
Sheehan John P.
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