Title:
METHOD OF MANUFACTURING R-T-B BASED SINTERED MAGNET
Document Type and Number:
Japanese Patent JP2023037123
Kind Code:
A
Abstract:
To suppress warpage that occurs when a powder compact with a sheet shape is sintered.SOLUTION: A method for manufacturing an R-T-B based sintered magnet includes a step of preparing a compact of R-T-B based alloy powder including a rare earth element, and a sintering step of sintering the compact in a heat treatment furnace. The compact has a sheet shape with a thickness of 8 nm or less. The sintering step includes: a first temperature-raising step of raising a preset temperature to a first temperature at a first heating rate; a second temperature-raising step of raising a preset temperature to a second temperature higher than the first temperature at a second heating rate lower than the first heating rate; and a first sintering temperature holding step of allowing the sintering of the compact to proceed at the second temperature. The second heating rate is 0.1°C/min or more and 1.5°C/min or less, and a difference between the first temperature and the second temperature is 20°C or more.SELECTED DRAWING: Figure 2
Inventors:
MURATA TSUYOSHI
Application Number:
JP2021143674A
Publication Date:
March 15, 2023
Filing Date:
September 03, 2021
Export Citation:
Assignee:
PROTERIAL LTD
International Classes:
H01F41/02; B22F1/00; B22F3/00; B22F3/10; C22C38/00; H01F1/055
Attorney, Agent or Firm:
Okuda Seiji
Kita Osamu
Kajitani Mido
Kita Osamu
Kajitani Mido
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