Title:
R-T-B SINTERED MAGNET AND PRODUCTION METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2018/101402
Kind Code:
A1
Abstract:
The R-T-B sintered magnet according to one embodiment of the present invention has a composition comprising: 27-37 mass% of R (R represents at least one of the rare-earth elements and essentially includes Nd and/or Pr); 0.75-0.97 mass% of B; 0.1-1.0 mass% of Ga; 0-1.0 mass% of Cu; at least 61.03 mass% of T (T represents at least one member selected from the group consisting of Fe, Co, Al, Mn, and Si, and essentially includes Fe such that the Fe content is at least 80 mass% with respect to T overall). The molar ratio of T with respect to B ([T]/[B]) exceeds 14.0. The amount of R in the surface portion of the magnet is greater than that in the central portion of the magnet, while the amount of Ga in the surface portion of the magnet is greater than that in the central portion of the magnet. The molar ratio of T with respect to B ([T]/[B]) in the surface portion of the magnet is higher than that in the central portion of the magnet.
Inventors:
NOZAWA NORIYUKI
SHIGEMOTO YASUTAKA
NISHIUCHI TAKESHI
SHIGEMOTO YASUTAKA
NISHIUCHI TAKESHI
Application Number:
PCT/JP2017/043058
Publication Date:
June 07, 2018
Filing Date:
November 30, 2017
Export Citation:
Assignee:
HITACHI METALS LTD (JP)
International Classes:
H01F41/02; B22F3/00; B22F3/10; B22F3/24; C21D9/00; C22C28/00; C22C33/02; C22C38/00; H01F1/057
Domestic Patent References:
| WO2016133071A1 | 2016-08-25 | |||
| WO2016133080A1 | 2016-08-25 |
Foreign References:
| JP2014225623A | 2014-12-04 |
Attorney, Agent or Firm:
OKUDA Seiji (JP)
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