METHOD OF PRODUCING R-T-B SINTERED MAGNET

Title:

METHOD OF PRODUCING R-T-B SINTERED MAGNET

Document Type and Number:

WIPO Patent Application WO/2012/099186

Kind Code:

A1

Abstract:

This method of producing an R-T-B sintered magnet involves: a step for preparing at least one R-T-B sintered magnet material (R is a rare earth element, T is Fe or Fe and Co); a step for preparing multiple RH diffusion sources having a heavy rare earth element RH (Dy and/or Tb) and 30-80 mass% Fe and with particle diameters of over 53μm but not more than 5600μm; a step for arranging the R-T-B sintered magnet material and the RH diffusion sources in a processing vessel, wherein several of the RH diffusion sources are brought into contact with the R-T-B sintered magnet material; an RH diffusion step for heat-treating in the processing vessel at 800-1000°C in an inert atmosphere under a pressure of 5000 Pa or less the R-T-B sintered magnet material in a state in contact with several RH diffusion sources, the RH diffusion sources in contact with the R-T-B sintered magnet material, and the RH diffusion sources not in contact therewith; and a separation step for separating the RH diffusion sources from the R-T-B sintered magnet material.

Inventors:

KUNIYOSHI FUTOSHI (JP)

Application Number:

PCT/JP2012/051032

Publication Date:

July 26, 2012

Filing Date:

January 19, 2012

Export Citation:

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Assignee:

HITACHI METALS LTD (JP)
KUNIYOSHI FUTOSHI (JP)

International Classes:

H01F41/02; B22F1/00; B22F3/24; C22C1/00; C22C1/04; C22C28/00; C22C33/02; C22C38/00; H01F1/053; H01F1/08

Domestic Patent References:

WO2006064848A1	2006-06-22
WO2008032426A1	2008-03-20
WO2007102391A1	2007-09-13
WO2007102391A1	2007-09-13
WO2008032426A1	2008-03-20

Foreign References:

JP2006303197A	2006-11-02
JP2007258455A	2007-10-04
JP2009289994A	2009-12-10
JP2008263179A	2008-10-30
JPS63219548A	1988-09-13

Other References: