Rare earth magnet and method for manufacturing the same

Details Rare earth magnet and method for manufacturing the same Rare earth magnet and method for manufacturing the same

2006-11-28

2006-11-28

Sheehan, John P. (Department: 1742)

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

C148S101000, C148S104000, C419S012000, C419S030000, C419S033000, C419S038000

Reexamination Certificate

active

07141126

ABSTRACT:
Rare earth alloy powder having an oxygen content of 50 to 4000 wt. ppm and a nitrogen content of 150 to 1500 wt. ppm is compacted by dry pressing to produce a compact. The compact is impregnated with an oil agent and then sintered. The sintering process includes a first step of retaining the compact at a temperature of 700° C. to less than 1000° C. for a period of time of 10 to 420 minutes and a second step of permitting proceeding of sintering at a temperature of 1000° C. to 1200° C. The average crystal grain size of the rare earth magnet after the sintering is controlled to be 3 μm to 9 μm.

REFERENCES:
patent: 5489343 (1996-02-01), Uchida et al.
patent: 5645651 (1997-07-01), Fujimura et al.
patent: 5788782 (1998-08-01), Kaneko et al.
patent: 5858123 (1999-01-01), Uchida et al.
patent: 5968289 (1999-10-01), Sakurada et al.
patent: 6296720 (2001-10-01), Yamamoto et al.
patent: 6468365 (2002-10-01), Uchida et al.
patent: 6482353 (2002-11-01), Kuniyoshi et al.
patent: 6511631 (2003-01-01), Kuniyoshi et al.
patent: 6529107 (2003-03-01), Shimuzu et al.
patent: 0 753 867 (1997-01-01), None
patent: 0 994 493 (2000-04-01), None
patent: 62-170455 (1987-07-01), None
patent: 63-033505 (1988-02-01), None
patent: 63-301505 (1988-12-01), None
patent: 07-018366 (1995-01-01), None
patent: 08-069908 (1996-03-01), None
patent: 08-279406 (1996-10-01), None
patent: 10-012473 (1998-01-01), None
patent: 10-041174 (1998-02-01), None
patent: 10-321451 (1998-12-01), None
patent: WO 93/20567 (1993-10-01), None
European Search Report (Dated Jul. 24, 2003).
Notice of Reasons of Rejection, Patent Application No. 2001-272116, Mailing Date: Dec. 25, 2001, Mailing No. 593114.
Mikio et al., English language translation of Japanese Patent Document No. 08-279406, Oct. 22, 1996, Original Japanese document cited in applicants' IDS submitted Mar. 15, 2002.

Affiliated with

Also associated with

Rating

Rare earth magnet and method for manufacturing the same does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Rare earth magnet and method for manufacturing the same, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Rare earth magnet and method for manufacturing the same will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3656425