R-T-B—C rare earth sintered magnet and making method

Details R-T-B—C rare earth sintered magnet and making method R-T-B—C rare earth sintered magnet and making method

2011-08-02

2011-08-02

Sheehan, John P (Department: 1793)

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

C148S101000, C148S302000

Reexamination Certificate

active

07988795

ABSTRACT:
An R-T-B—C rare earth sintered magnet (R═Ce, Pr, Nd, Tb, or Dy; T=Fe) is obtained by mixing an R-T-B—C magnet matrix alloy with an R fluoride and an R-rich R-T-B—C sintering aid alloy, followed by pulverization, compaction and sintering. The sintered structure consists of an R2T14B type crystal primary phase and a grain boundary phase. The grain boundary phase consists essentially of 40-98 vol % of R—O1-x—F1+2xand/or R—Fy, 1-50 vol % of R—O, R—O—C or R—C compound phase, 0.05-10 vol % of R-T phase, 0.05-20 vol % of B-rich phase or M-B2phase (M=Ti, V, Cr, Zr, Nb, Mo, Hf, Ta or W), and the balance of an R-rich phase.

REFERENCES:
patent: 5858124 (1999-01-01), Endo et al.
patent: 7485193 (2009-02-01), Hirota et al.
patent: 2005/0081959 (2005-04-01), Kim et al.
patent: 2006/0213583 (2006-09-01), Nakamura et al.
patent: 2006/0213585 (2006-09-01), Nakamura et al.
patent: 2006/0222848 (2006-10-01), Satsu et al.
patent: 2007/0071979 (2007-03-01), Komuro et al.
patent: 2008/0245442 (2008-10-01), Nakamura et al.
patent: 0 286 357 (1988-10-01), None
patent: 0 994 493 (2000-04-01), None
patent: 62-171102 (1987-07-01), None
patent: 63-255902 (1988-10-01), None
patent: 6-244011 (1994-09-01), None
patent: 9-186010 (1997-07-01), None
patent: 10-163055 (1998-06-01), None
patent: 2001-68317 (2001-03-01), None
patent: 2001-230107 (2001-08-01), None
patent: 2002-64010 (2002-02-01), None
patent: 2003-22905 (2003-01-01), None
patent: 2003-70214 (2003-03-01), None
patent: 2003-282312 (2003-10-01), None
Machine Translation of Japanese Patent Document No. 2003-022905.
Machine Translation of Japanese Patent Document No. 2003-282312.
Japanese Office Action issued on Apr. 28, 2010 in corresponding Japanese Patent Application No. 2005-349185.
Japanese Office Action issued on Apr. 28, 2010 in corresponding Japanese Patent Application No. 2005-349192.
Extended European Search Report issued on Jun. 25, 2008 in European Patent Application No. 06 25 6182.

Affiliated with

Also associated with

Rating

R-T-B—C rare earth sintered magnet and making method does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with R-T-B—C rare earth sintered magnet and making method, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and R-T-B—C rare earth sintered magnet and making method will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2642913