METHOD FOR PREPARING R-FE-B-BASED RARE EARTH MAGNETIC POWDER FOR A BONDED MAGNET, MAGNETIC POWDER PREPARED BY THE METHOD, METHOD FOR PRODUCING A BONDED MAGNET USING THE MAGNETIC POWDER, AND BONDED MAGNET PRODUCED BY THE METHOD

Title:

Document Type and Number:

WIPO Patent Application WO/2012/002774

Kind Code:

A2

Abstract:

The present invention relates to a method for preparing R-Fe-B-based rare earth magnetic powder for a bonded magnet, to magnetic powder prepared by the method, to a method for producing a bonded magnet using the magnetic powder, and to a bonded magnet produced by the method. More particularly, the present invention relates to a method for preparing R-Fe-B-based rare earth magnetic powder having improved magnetic properties, to magnetic powder prepared by the method, to a method for producing a bonded magnet using the magnetic powder, and to a bonded magnet produced by the method. The method for preparing R-Fe-B-based rare earth magnetic powder comprises: a step (step 1) of coarsely grinding sintered rare-earth magnet products serving as raw materials; a hydrogenating step (step 2) of filling an evacuated tube furnace with the ground products obtained in step 1, filling the tube furnace with hydrogen, and raising the temperature of the tube furnace; a phase decomposition step (step 3) of further raising the temperature of the tube furnace under a hydrogen atmosphere that is the same as that of step 2; a hydrogen-emitting step (step 4) of discharging the hydrogen of step 3 from the inside of the tube furnace; and a rebonding step (step 5) of evacuating the hydrogen pressure by vacuum from the inside of the tube furnace after finishing step 4.

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Inventors:

YU JI-HUN (KR)
KIM DONGHWAN (KR)
LEE DONGWON (KR)
LEE JUNGGOO (KR)

Application Number:

PCT/KR2011/004863

Publication Date:

January 05, 2012

Filing Date:

July 01, 2011

Export Citation:

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Assignee:

KOREA MACH & MATERIALS INST (KR)
YU JI-HUN (KR)
KIM DONGHWAN (KR)
LEE DONGWON (KR)
LEE JUNGGOO (KR)

International Classes:

B22F1/00; B22F3/00; H01F1/053

Foreign References:

JP3250551B2	2002-01-28
JP2002093610A	2002-03-29
KR20050065612A	2005-06-29

Attorney, Agent or Firm:

LEE, Won Hee (642-16Yoksam-dong,Kangnam-ku, Seoul 135-080, KR)

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