Title:
METHOD OF PRODUCING R-T-B SINTERED MAGNET
Document Type and Number:
WIPO Patent Application WO/2018/062174
Kind Code:
A1
Abstract:
This invention includes: an application step for applying an adhesive to an application region of the surface of an R-T-B sintered magnet material; an adhesion step for causing a granularity adjustment powder formed from a powder of a compound or an alloy of a Pr-Ga alloy, which is Dy and/or Tb, to adhere to the application region of the surface of the R-T-B sintered magnet material; and a diffusion step for performing a heat treatment at a temperature equal to or less than the sintering temperature of the R-T-B sintered magnet material and causing the Pr-Ga alloy contained in the granularity adjustment powder to be diffused from the surface of the R-T-B sintered magnet material to the interior. The granularity of the granularity adjustment powder is set so that the amount of Ga contained in the granularity adjustment powder is in a range of 0.10-1.0% by mass in relation to the R-T-B sintered magnet material when the powder particles constituting the granularity adjustment powder are disposed across the entire surface of the R-T-B sintered magnet material to form one to three particle layers.
More Like This:
Inventors:
KUNIYOSHI FUTOSHI
MINO SHUJI
MINO SHUJI
Application Number:
PCT/JP2017/034730
Publication Date:
April 05, 2018
Filing Date:
September 26, 2017
Export Citation:
Assignee:
HITACHI METALS LTD (JP)
International Classes:
H01F41/02; B22F1/00; B22F1/05; B22F3/00; B22F3/24; C21D6/00; C22C28/00; C22C30/00; C22C38/00; H01F1/057
Domestic Patent References:
| WO2016133071A1 | 2016-08-25 |
Foreign References:
| JP2012234971A | 2012-11-29 | |||
| JP2016129217A | 2016-07-14 | |||
| JP2004027313A | 2004-01-29 |
Other References:
See also references of EP 3522185A4
Attorney, Agent or Firm:
OKUDA Seiji (JP)
Download PDF: