Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
METHOD FOR PRODUCING RARE EARTH PERMANENT MAGNETS, AND RARE EARTH PERMANENT MAGNETS
Document Type and Number:
WIPO Patent Application WO/2011/145674
Kind Code:
A1
Abstract:
R-T-B permanent magnetic powder is manufactured by the HDDR process, said magnetic powder having an average crystal grain size of 0.1 μm to 1 μm and an aspect ratio (major axis/minor axis) for the crystal grains of not more than 2 (Step A). R is a rare earth element containing at least 95 at% Nd or Pr with respect to total R. T is a transition metal element in which Fe or a portion of Fe has been substituted with Co and/or Ni, and which contains at least 50 at% Fe. Meanwhile, an R'-Cu alloy powder is prepared, said alloy powder comprising R' and Cu, and containing between 2 at% and 50 at% Cu (Step B). R' is a rare earth element containing at least 90 at% Nd and/or Pr with respect to total R', and not containing Dy and Tb. After mixing the R-T-B permanent magnetic powder with the R'-Cu alloy powder (Step C), the mixed powder is treated with heat at a temperature of 500°C to 900°C in an inert atmosphere or a vacuum (Step D).

Inventors:
HONO Kazuhiro (2-1 Sengen 1-chome, Tsukuba-sh, Ibaraki 47, 〒3050047, JP)
宝野 和博 (〒47 茨城県つくば市千現一丁目2番地1独立行政法人物質・材料研究機構内 Ibaraki, 〒3050047, JP)
OHKUBO Tadakatsu (2-1 Sengen 1-chome, Tsukuba-sh, Ibaraki 47, 〒3050047, JP)
大久保 忠勝 (〒47 茨城県つくば市千現一丁目2番地1独立行政法人物質・材料研究機構内 Ibaraki, 〒3050047, JP)
SEPEHRI AMIN Hossein (2-1 Sengen 1-chome, Tsukuba-sh, Ibaraki 47, 〒3050047, JP)
セペリ アミン ホセイン (〒47 茨城県つくば市千現一丁目2番地1独立行政法人物質・材料研究機構内 Ibaraki, 〒3050047, JP)
Application Number:
JP2011/061488
Publication Date:
November 24, 2011
Filing Date:
May 19, 2011
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
NATIONAL INSTITUTE FOR MATERIALS SCIENCE (2-1 Sengen 1-chome, Tsukuba-shi Ibaraki, 47, 〒3050047, JP)
独立行政法人物質・材料研究機構 (〒47 茨城県つくば市千現一丁目2番地1 Ibaraki, 〒3050047, JP)
HITACHI METALS, LTD. (2-1 Shibaura 1-chome, Minato-ku Tokyo, 14, 〒1058614, JP)
日立金属株式会社 (〒14 東京都港区芝浦1丁目2-1 Tokyo, 〒1058614, JP)
HONO Kazuhiro (2-1 Sengen 1-chome, Tsukuba-sh, Ibaraki 47, 〒3050047, JP)
宝野 和博 (〒47 茨城県つくば市千現一丁目2番地1独立行政法人物質・材料研究機構内 Ibaraki, 〒3050047, JP)
OHKUBO Tadakatsu (2-1 Sengen 1-chome, Tsukuba-sh, Ibaraki 47, 〒3050047, JP)
大久保 忠勝 (〒47 茨城県つくば市千現一丁目2番地1独立行政法人物質・材料研究機構内 Ibaraki, 〒3050047, JP)
International Classes:
H01F41/02; B22F1/00; B22F3/14; C21D6/00; C22C38/00; H01F1/053; H01F1/06
Attorney, Agent or Firm:
OKUDA Seiji (OKUDA & ASSOCIATES, 10th Floor Osaka Securities Exchange Bldg., 8-16, Kitahama 1-chome, Chuo-k, Osaka-shi Osaka 41, 〒5410041, JP)
Download PDF:
Claims:



 
Previous Patent: BRAKE DEVICE

Next Patent: CURRENT GENERATION DEVICE