Magnetic powder and isotropic bonded magnet

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

2005-02-08

2005-02-08

Sheehan, John P (Department: 1742)

Compositions

Magnetic

Free metal or alloy containing

C148S302000, C420S083000, C420S121000

Reexamination Certificate

active

06852246

ABSTRACT:
Disclosed herein is magnetic powder which can provide a magnet having a high magnetic flux density and excellent magnetizability and reliability especially excellent heat resistance property (heat stability). The magnetic powder is composed of an alloy composition represented by Rx(Fe1-yCoy)100-x-z-wBzSiw(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 0.2-3.0 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 (χirrwhich is measured by using an intersection 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: 6019859 (2000-02-01), Kanekiyo et al.
patent: 6171410 (2001-01-01), Kojima et al.
patent: 6521054 (2003-02-01), 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: 20010020496 (2001-09-01), Arai et al.
patent: 20020007874 (2002-01-01), Arai et al.
patent: 0 195 219 (1986-09-01), None
patent: 0 657 899 (1995-06-01), None
patent: 0 823 713 (1998-02-01), None
patent: 01-205403 (1989-08-01), None
patent: 05-299222 (1993-11-01), None
patent: 7-54106 (1995-02-01), None
patent: 07-054106 (1995-02-01), None
patent: 07-176417 (1995-07-01), None
patent: 08-045719 (1996-02-01), None
patent: 08-051007 (1996-02-01), None
patent: 08-162312 (1996-06-01), None
patent: 10-053844 (1996-08-01), None
patent: 10-088294 (1996-09-01), None
patent: 09-139307 (1997-05-01), None
patent: 09266113 (1997-10-01), None
patent: 09-270310 (1997-10-01), None
patent: 10-012423 (1998-01-01), None
patent: 10-012472 (1998-01-01), None
patent: 10-053844 (1998-02-01), None
patent: 10-088294 (1998-04-01), None
patent: 10-177911 (1998-06-01), None
patent: 10-265915 (1998-10-01), None
patent: 11-045805 (1999-02-01), None
patent: 11-067515 (1999-03-01), None
patent: 11-097222 (1999-04-01), None
patent: 11-186016 (1999-07-01), None
patent: 11-195514 (1999-07-01), None
patent: 11-288807 (1999-10-01), None
patent: 2001-035712 (2001-02-01), None
patent: 2001-196210 (2001-07-01), None
patent: 2001-196211 (2001-07-01), None
patent: 2003-508892 (2003-03-01), None
patent: WO 9921196 (1999-04-01), None
Hayashida et al., “Flux Stability in Nd-Fe-B Based Exchange-coupled Spring Magnets”, Materials for Magnetics Society of the Institute of Electrical Engineers of Japan (MAG-97-211), pp. 19-24.
Journal of Applied Physics, “Magnetic Properties Enhancement of a-Fe/Nd2FE14B-type Nanocomposites by Co Substitution”, vol. 83, No. 4, Feb. 15, 1998, pp. 2147-2151.
Journal of Magnetism and Magnetic Materials, “Magnetic and Microstructural Properties of Nanocrystalline Exchange Coupled PrFeB Permanent Magnets”, 185 (1998) pp. 49-60.
U.S. Appl. No. 09/620,703, filed Jul 2000, Arai.
Examination from Japanese Patent Office re related Japanese App'l No. 2000-169240.

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-3481710