Title:
METHOD FOR PRODUCING R-T-B-BASED SINTERED MAGNET
Document Type and Number:
WIPO Patent Application WO/2022/209466
Kind Code:
A1
Abstract:
A method for producing an R-T-B-based sintered magnet according to the present disclosure comprises a sintering step for sintering a shaped product of R-T-B-based alloy powder. This sintering step includes: a first stage step for heating the shaped product at a first sintering temperature T1 to prepare a first stage sintered body; a cooling step for lowering the temperature of the first stage sintered body to a cooling temperature T0; and a second stage step for heating the first stage sintered body at a second sintering temperature T2 to prepare a second stage sintered body. The first sintering temperature T1 and the second sintering temperature T2 are higher than 900°C, and the cooling temperature T0 is 900°C or lower. A first sintering time t1 for which the first sintering temperature T1 is maintained in the first stage step is shorter than a second sintering time t2 for which the second sintering temperature T2 is maintained in the second stage step.
Inventors:
SAITOU KOUTA
KUNIYOSHI FUTOSHI
KUNIYOSHI FUTOSHI
Application Number:
PCT/JP2022/007631
Publication Date:
October 06, 2022
Filing Date:
February 24, 2022
Export Citation:
Assignee:
HITACHI METALS LTD (JP)
International Classes:
C21D6/00; B22F1/00; B22F3/00; C21D9/00; C22C33/02; C22C38/00; H01F1/057; H01F41/02
Domestic Patent References:
| WO2009075351A1 | 2009-06-18 |
Foreign References:
| JP2019169560A | 2019-10-03 | |||
| JPH10303008A | 1998-11-13 | |||
| JP2004103659A | 2004-04-02 | |||
| JP2004111481A | 2004-04-08 | |||
| JP2015113525A | 2015-06-22 |
Attorney, Agent or Firm:
OKUDA Seiji (JP)
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