Magnetic powder and isotropic bonded magnet

Details Magnetic powder and isotropic bonded magnet Magnetic powder and isotropic bonded magnet

2006-08-08

2006-08-08

Sheehan, John P. (Department: 1742)

Compositions

Magnetic

With wax, bitumen, resin, or gum

C148S302000

Reexamination Certificate

active

07087185

ABSTRACT:
Disclosed herein is a magnetic powder which can provide a magnet having a high magnetic flux density and excellent magnetizability and reliability especially excellent heat resisting property (heat stability). The magnetic powder is composed of an alloy composition represented by Rx(Fe1-yCoy)100-x-z-wBzAlw(where R is at least one kind of rare-earth element, x is 8.1–9.4 at %, y is 0–0.30, z is 4.6–6.8 at %, and w is 0.02–1.5 at %), the magnetic powder being constituted from a composite structure having a soft magnetic phase and a hard magnetic phase, wherein the magnetic powder has characteristics in which, when the magnetic powder is formed into an isotropic bonded magnet by mixing with a binding resin and then molding it, the irreversible susceptibility (χirr) which is measured by using an intersectioning point of a demagnetization curve in the J-H diagram representing the magnetic characteristics at the room temperature and a straight line which passes the origin in the J-H diagram and has a gradient (J/H) of −3.8×10−6H/m as a starting point is less than 5.0×10−7H/m, and the intrinsic coercive force (HCJ) of the magnet at the room temperature is in the range of 406–717 kA/m.

REFERENCES:
patent: 4975213 (1990-12-01), Sakai et al.
patent: 5449417 (1995-09-01), Shimizu et al.
patent: 5750044 (1998-05-01), Yoneyama et al.
patent: 5872501 (1999-02-01), Hamano et al.
patent: 5888417 (1999-03-01), Akioka et al.
patent: 6019859 (2000-02-01), Kanekiyo et al.
patent: 6171410 (2001-01-01), Kojima et al.
patent: 6187217 (2001-02-01), Arai et al.
patent: 6338761 (2002-01-01), Kanekiyo et al.
patent: 6500277 (2002-12-01), Arai 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: 0 195 219 (1986-09-01), None
patent: 0 657 899 (1995-06-01), None
patent: 1 017 066 (2000-07-01), None
patent: 58-136739 (1983-08-01), None
patent: 63-213324 (1988-09-01), None
patent: 01-205403 (1989-08-01), None
patent: 4-75302 (1992-03-01), None
patent: 05-261494 (1993-10-01), None
patent: 06-045167 (1994-02-01), None
patent: 7-54106 (1995-02-01), None
patent: 08-045719 (1996-02-01), None
patent: 08-281383 (1996-10-01), None
patent: 10-177911 (1998-06-01), None
patent: 10-241923 (1998-09-01), None
patent: 10-261515 (1998-09-01), None
patent: 10259459 (1998-09-01), None
patent: 10-265915 (1998-10-01), None
patent: 10-317110 (1998-12-01), None
patent: 11-273920 (1999-10-01), None
patent: 11-288807 (1999-10-01), None
patent: 2001-035712 (2001-02-01), None
U.S. Appl. No. 09/590,820, filed Jun. 9, 2000, Arai.
Chang, Wu, Ma, Bounds and Yao, “Magnetic Properties Enhancement of α-Fe/Nd2FE14B-type Nanocomposites by Co Substitution,” Journal of Applied Physics, vol. 83, No. 4, Feb. 15, 1998, pp. 2147-2151.
D. Goll, M. Seeger, H. Kronmuller, “Magnetic and Microstructural Properties of Nanocystalline Exchange Coupled PrFeB Permanent Magnets,” Journal of Magnetism and Magnetic Materials, Sep. 16, 1997, pp. 49-60.
Grieb et al., “Influence of Al-Based Additions on the Coercivity and Microstructure in FE-Nd-B Magnets,” Journal of Magnetism and Magnetic Materials, 80 (1989), pp. 75-79.
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. **.
Chang, 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. 15, 1998, pp. 2147-2151. **.
Grieb, Th, Henig, Martinek, Stadelmaier and Petzow, “Phase Relations and Magnetic Properties of New Phases in the Fe-No-Al and Fe-No-C Systems and Their Influence on Magnets,” 8108 IEEE Transactions on Magnetics Sep. 26, 1990, No. 5, New York, US, pp. 1367-1369.
Shinichi Hayashida, Yasuhisa Kanai, Hirotoshi Fukunaga (Nagasaki Univ.), Fumitoshi Yamashita (Matsushita Electric Ind. Co., ltd.), “Flux stability in Nd-Fe-B-based exchange-coupled spring magnets”, pp. 19-24.

Affiliated with

Also associated with

Rating

Magnetic powder and isotropic bonded magnet does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Magnetic powder and isotropic bonded magnet, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Magnetic powder and isotropic bonded magnet will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3649069