Title:
METHOD OF MANUFACTURING R-T-B BASED SINTERED MAGNET
Document Type and Number:
Japanese Patent JP2023035796
Kind Code:
A
Abstract:
To suppress decreases in coercive force HcJ and squareness ratio Hk/HcJ due to variations in manufacturing conditions.SOLUTION: A method for manufacturing an R-T-B based sintered magnet includes: a step of preparing a compact of alloy powder including a rare earth element; a sintering step of sintering the compact to produce a sintered body; a first heat treatment step of heat-treating the sintered body at a first temperature of 300°C or higher and less than 400°C for 30 minutes or more and 900 minutes or less in a heat treatment furnace; and a second heat treatment step of heat-treating the sintered body at a second temperature of 400°C or higher and 500°C or lower for 30 minutes or more and 900 minutes or less in the heat treatment furnace. A difference between the first temperature and the second temperature is 50°C or more.SELECTED DRAWING: Figure 2
Inventors:
TSUKAMOTO HIROKI
SETO TORU
OBATA TORU
SETO TORU
OBATA TORU
Application Number:
JP2022046723A
Publication Date:
March 13, 2023
Filing Date:
March 23, 2022
Export Citation:
Assignee:
PROTERIAL LTD
International Classes:
B22F1/00; H01F41/02; B22F3/00; C21D6/00; C21D9/00; C22C33/02; C22C38/00; H01F1/057
Attorney, Agent or Firm:
Okuda Seiji
Kita Osamu
Kita Osamu