Herstellungsverfahren für Partikel für R-T-B Seltene-Erden-Magneten

Details

Veröffentlichungs-Nr.

EP2645381

Aktenzeichen

EP13161404

Anmeldetag

27. März 2013

Veröffentlichung

25. März 2020

Erteilung

25. März 2020

Rechtsraum

EP

IPC

H01F41/02H01F1/057B22F1/00C22C33/02C22C38/00C22C38/06C22C38/10C22C38/14

Abstract

The present invention relates to a process for producing R-T-B-based rare earth magnet particles by HDDR treatment which comprises a first stage HD step of heating particles of a raw material alloy having a composition comprising R in an amount of not less than 12.5 atom% and not more than 14.3 atom%, B in an amount of not less than 4.5 atom% and not more than 7.5 atom% and Co in an amount of not more than 10 atom% to a temperature range of not lower than 770°C and not higher than 820°C in an inert atmosphere or in a vacuum atmosphere and then replacing the atmosphere with a hydrogen-containing gas atmosphere in which the raw material alloy particles are held in the same temperature range; and a second stage HD step of heating a material obtained in the first stage HD step again to a temperature range of not lower than 830°C and not higher than 870°C in which the material is held in the hydrogen-containing gas atmosphere.

Anmelder

Firmen

Toda Kogyo Corp.
Toda Kogyo Corporation

Land

🇯🇵 Japan

Fachgebiete