Title:
METHOD FOR MANUFACTURING R-T-B BASED SINTERED MAGNET, AND R-T-B BASED SINTERED MAGNET
Document Type and Number:
WIPO Patent Application WO/2021/132476
Kind Code:
A1
Abstract:
A method for manufacturing an R-T-B based sintered magnet according the present disclosure comprises: a step for preparing a coarse ground powder which is made from an alloy for R-T-B based sintered magnets and which has an average particle size of 10-500 μm; a step for obtaining a fine powder having an average particle size of 2.0-4.5 μm, by feeding the coarse ground powder to a jet mill device that has a grinding chamber filled with inert gas and grinding the coarse ground powder; and a step for producing a sintered body of the fine powder, wherein the inert gas has been humidified, and the oxygen content of the R-T-B based sintered magnet is 1000-3500 ppm by mass.
Inventors:
FUJIMORI NOBUHIKO
OBATA TOHRU
SONODA KAZUHIRO
KUNIYOSHI FUTOSHI
FURUSAWA DAISUKE
MAKI TOMOHITO
MINO SHUJI
SAITOU KOUTA
OBATA TOHRU
SONODA KAZUHIRO
KUNIYOSHI FUTOSHI
FURUSAWA DAISUKE
MAKI TOMOHITO
MINO SHUJI
SAITOU KOUTA
Application Number:
PCT/JP2020/048486
Publication Date:
July 01, 2021
Filing Date:
December 24, 2020
Export Citation:
Assignee:
HITACHI METALS LTD (JP)
International Classes:
B22F1/00; B22F3/00; B22F3/02; B22F3/24; B22F9/04; C22C38/00; H01F1/057; H01F41/02
Foreign References:
| JPH1022154A | 1998-01-23 | |||
| JPH06140220A | 1994-05-20 | |||
| JPH04287304A | 1992-10-12 | |||
| JP2012158792A | 2012-08-23 | |||
| JP2011060975A | 2011-03-24 | |||
| JP2018142641A | 2018-09-13 | |||
| JP2019169506A | 2019-10-03 | |||
| JPH08148317A | 1996-06-07 | |||
| JPH06140220A | 1994-05-20 |
Other References:
See also references of EP 4082691A4
Attorney, Agent or Firm:
OKUDA Seiji (JP)
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