Title:
RARE EARTH SINTERED MAGNET, METHOD FOR MANUFACTURING RARE EARTH SINTERED MAGNET AND ROTARY MACHINE
Document Type and Number:
WIPO Patent Application WO/2012/161355
Kind Code:
A1
Abstract:
Provided are a rare earth sintered magnet having excellent corrosion resistance and improved temperature characteristics and strength, a method for manufacturing a rare earth sintered magnet, and a rotary machine. A rare earth sintered magnet includes at least a main phase (11) comprising an R2T14B chemical compound (where R is one or more rare earth element including as the principle component either or both of Nd and Pr, and T indicates one or more transition element including Fe or Fe and Co) and a grain boundary phase (15) containing more R than the main phase (11). The main phase (11) includes a heavy rare earth element (including at least either or both of Dy and Tb). The main phase grains of at least part of the main phase (11) contained in the rare earth sintered magnet include at least three regions, namely, a low concentration region (12), a high concentration region (13) and an intermediate concentration region (14). These three regions are present in the following order: low concentration region (12), high concentration region (13) and intermediate concentration region (14), from the low concentration region (12) going towards the grain boundary phase (15) in a main phase grain.
Inventors:
HIDAKA TETSUYA (JP)
SATO KAZUO (JP)
SAKAMOTO KAZUYA (JP)
FUJITO SHINYA (JP)
HOSAKO MOTOAKI (JP)
MURATA MOTOHISA (JP)
MITAKE KOJI (JP)
SATO KAZUO (JP)
SAKAMOTO KAZUYA (JP)
FUJITO SHINYA (JP)
HOSAKO MOTOAKI (JP)
MURATA MOTOHISA (JP)
MITAKE KOJI (JP)
Application Number:
PCT/JP2012/064254
Publication Date:
November 29, 2012
Filing Date:
May 25, 2012
Export Citation:
Assignee:
TDK CORP (JP)
HIDAKA TETSUYA (JP)
SATO KAZUO (JP)
SAKAMOTO KAZUYA (JP)
FUJITO SHINYA (JP)
HOSAKO MOTOAKI (JP)
MURATA MOTOHISA (JP)
MITAKE KOJI (JP)
HIDAKA TETSUYA (JP)
SATO KAZUO (JP)
SAKAMOTO KAZUYA (JP)
FUJITO SHINYA (JP)
HOSAKO MOTOAKI (JP)
MURATA MOTOHISA (JP)
MITAKE KOJI (JP)
International Classes:
H01F1/057; B22F1/00; B22F3/10; C22C33/02; C22C38/00; H01F1/08; H01F41/02
Domestic Patent References:
| WO2010082492A1 | 2010-07-22 |
Foreign References:
| JPH07122413A | 1995-05-12 | |||
| JP2001230107A | 2001-08-24 | |||
| JP2007294917A | 2007-11-08 | |||
| JP2006210450A | 2006-08-10 |
Attorney, Agent or Firm:
SAKAI, HIROAKI (JP)
Hiroaki Sakai (JP)
Hiroaki Sakai (JP)
Download PDF:
Claims:
Previous Patent: AGRICULTURAL OR HORTICULTURAL FUNGICIDE COMPOSITION AND METHOD FOR CONTROLLING PLANT PATHOGEN
Next Patent: IMPLANT FIXTURE
Next Patent: IMPLANT FIXTURE