METHOD FOR MANUFACTURING R-T-B BASED SINTERED MAGNET

Title:

METHOD FOR MANUFACTURING R-T-B BASED SINTERED MAGNET

Document Type and Number:

WIPO Patent Application WO/2016/136705

Kind Code:

A1

Abstract:

Disclosed is a method for manufacturing an R-T-B based sintered magnet, said method comprising: a step for preparing a plurality of starting materials of the R-T-B based sintered magnet (wherein R is at least one member of rare earth elements and essentially comprises Nd and/or Pr, and T is at least one member of transition metal elements and essentially comprises Fe); a step for preparing a plurality of alloy powder grains that contain 20-80 mass% inclusive of a heavy rare earth element RH (wherein the heavy rare earth element RH comprises Tb and/or Dy) and have a grain size of not more than 90 μm; a step for loading into a treatment container the aforesaid starting materials of the R-T-B based sintered magnet and 2-15 wt% inclusive, relative to the starting materials of the R-T-B based sintered magnet, of the aforesaid alloy powder grains; and a step for supplying and diffusing RH by heating and simultaneously rotating and/or oscillating the treatment container to thereby continuously or intermittently move the starting materials of the R-T-B based sintered magnet and the alloy powder grains.

Inventors:

YAMAGATA RYOUICHI
KUNIYOSHI FUTOSHI

Application Number:

PCT/JP2016/055167

Publication Date:

September 01, 2016

Filing Date:

February 23, 2016

Export Citation:

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Assignee:

HITACHI METALS LTD (JP)

International Classes:

H01F41/02; H01F1/057; H01F1/08

Domestic Patent References:

WO2012043692A1

2012-04-05

Foreign References:

JP2014072259A	2014-04-21
JP2012169436A	2012-09-06

Other References: