Title:
METHOD FOR MANUFACTURING R-T-B SINTERED MAGNET
Document Type and Number:
WIPO Patent Application WO/2016/133080
Kind Code:
A1
Abstract:
[Problem] To provide a method for manufacturing an R-T-B sintered magnet in which the thickness can be increased up to the grain boundary between two particles in the magnet, the R-T-B sintered magnet having high coercive force even without the use of rare-earth elements and without a significant adverse effect on the coercive force improvement effect even from surface grinding. [Solution] A method including: a step for preparing an R1-T1-A-X alloy sintered compact (where: R1 is primarily Nd; T1 is primarily Fe; A is at least one of Ga, Ti, Zr, Hf, V, Nb, and Mo; and X is primarily B) primarily characterized in that the molar ratio of Ti/(X-2A) is 13 or greater; a step for preparing an R2-Ga-Cu alloy (where R2 is 65-95 mol% of primarily Pr and/or Nd, and the molar ratio of Cu/(Ga+Cu) is 0.1-0.9); and a step for bringing at least a portion of the R2-Ga-Cu alloy into contact with at least a portion of the surface of the R1-T1-A-X alloy sintered compact, and performing a heat treatment at a temperature of 450-600°C.
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Inventors:
NISHIUCHI TAKESHI (JP)
SHIGEMOTO YASUTAKA (JP)
NOZAWA NORIYUKI (JP)
SHIGEMOTO YASUTAKA (JP)
NOZAWA NORIYUKI (JP)
Application Number:
PCT/JP2016/054422
Publication Date:
August 25, 2016
Filing Date:
February 16, 2016
Export Citation:
Assignee:
HITACHI METALS LTD (JP)
International Classes:
H01F41/02; C22C28/00; C22C33/02; C22C38/00; H01F1/057; H01F1/08
Foreign References:
| JP2011014668A | 2011-01-20 | |||
| JP2015153813A | 2015-08-24 |
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