RARE EARTH ANISOTROPIC MAGNET AND PROCESS FOR PRODUCTION THEREOF

WIPO Patent Application WO/2011/070827

A1

Disclosed is a process for producing a rare earth anisotropic magnet, which is characterized by comprising: a molding step of mixing a magnet raw material that can produce R2TM14B1-type crystals that are crystals of a tetragonal compound composed of a rare earth element (R), boron (B) and a transition element (TM) with a diffusion raw material that serves as a supply source for at least a rare earth element (R') and Cu to produce a mixed raw material and press-molding the mixed raw material to produce a molded product; and a diffusion step of heating the molded product to cause the diffusion of at least R' and Cu in the surface areas or the crystal grain boundaries of the R2TM14B1-type crystals. In the process, the diffusion raw material that has a low melting point and high wettability coats the R2TM14B1-type crystals, and therefore a rare earth anisotropic magnet having high coercivity can be produced without deteriorating magnetization that can be developed by the magnet raw material intrinsically.

HONKURA YOSHINOBU (JP)
MISHIMA CHISATO (JP)

PCT/JP2010/064611

June 16, 2011

August 27, 2010

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AICHI STEEL CORP (JP)
HONKURA YOSHINOBU (JP)
MISHIMA CHISATO (JP)

H01F41/02; B22F1/00; B22F1/02; C22C38/00; H01F1/053; H01F1/06; H01F1/08

JPH09170055A	1997-06-30
JP2009054704A	2009-03-12
JPH0682575A	1994-03-22
JPH10326705A	1998-12-08
JP2001076917A	2001-03-23
JP2005097711A	2005-04-14
JP2003301203A	2003-10-24
JP2000336405A	2000-12-05
JP3452254B2	2003-09-29
JP2002093610A	2002-03-29
JP2010114200A	2010-05-20

JOURNAL OF THE JAPAN INSTITUTE OF METALS, vol. 72, no. 12, 2008, pages 1010 - 1014
See also references of EP 2511920A4

MORIOKA MASAYUKI (JP)
Morioka Right 往 (JP)

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