Title:
METHOD FOR MANUFACTURING R-T-B-BASED SINTERED MAGNET
Document Type and Number:
WIPO Patent Application WO/2019/065481
Kind Code:
A1
Abstract:
The present invention discloses a method for manufacturing an R-T-B-based sintered magnet, including: a step for preparing an R1-T1-B-based sintered body; a step for preparing an R2-Ga-Cu-Co-based alloy; a step for executing, by bringing at least a section of the alloy into contact with at least a section of a surface of the sintered body, a first heat treatment in a vacuum or inert-gas atmosphere at a temperature of 700ºC to 1100ºC; and a step for executing, on the R1-T1-B-based sintered body that has been subjected to the first heat treatment, a second heat treatment in the vacuum or inert-gas atmosphere at a temperature of 450ºC to 600ºC. R1 and R2 are at least one type of rare-earth element, and at least one of Nd and Pr is always included. The molar ratio of T1 with respect to B ([T1]/[B]) is greater than 14.0 and equal to or less than 15.0.
Inventors:
NOZAWA NORIYUKI
SHIGEMOTO YASUTAKA
NISHIUCHI TAKESHI
SHIGEMOTO YASUTAKA
NISHIUCHI TAKESHI
Application Number:
PCT/JP2018/034973
Publication Date:
April 04, 2019
Filing Date:
September 21, 2018
Export Citation:
Assignee:
HITACHI METALS LTD (JP)
International Classes:
H01F41/02; B22F3/00; B22F3/10; B22F3/24; C22C28/00; C22C30/00; C22C33/02; C22C38/00; H01F1/057
Domestic Patent References:
| WO2015020183A1 | 2015-02-12 | |||
| WO2016133071A1 | 2016-08-25 | |||
| WO2018101402A1 | 2018-06-07 |
Attorney, Agent or Firm:
OKUDA Seiji (JP)
Download PDF: