Title:
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
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 (# Ssangyong Yega apartment, Myeongryun-dongDongrae-gu, Busan 607-010, 607-010, KR)
유지훈 (부산광역시 동래구 명륜동 쌍용예가아파트, 607-010 Busan, 607-010, KR)
KIM, Donghwan (# Jueun apartment, Songjung-dongHeungdeok-gu,Cheongju-si, Chungcheongbuk-do 361-290, 361-290, KR)
김동환 (충청북도 청주시 흥덕구 송정동 주은아파트, 361-290 Chungcheongbuk-do, 361-290, KR)
유지훈 (부산광역시 동래구 명륜동 쌍용예가아파트, 607-010 Busan, 607-010, KR)
KIM, Donghwan (# Jueun apartment, Songjung-dongHeungdeok-gu,Cheongju-si, Chungcheongbuk-do 361-290, 361-290, KR)
김동환 (충청북도 청주시 흥덕구 송정동 주은아파트, 361-290 Chungcheongbuk-do, 361-290, KR)
Application Number:
KR2011/004863
Publication Date:
January 05, 2012
Filing Date:
July 01, 2011
Export Citation:
Assignee:
KOREA INSTITUTE OF MACHINERY AND MATERIALS (171Jang-dong, Yuseong-gu, Daejeon 305-343, 305-343, KR)
한국기계연구원 (대전 유성구 장동 171번지, 305-343 Daejeon, 305-343, KR)
YU, Ji-Hun (# Ssangyong Yega apartment, Myeongryun-dongDongrae-gu, Busan 607-010, 607-010, KR)
유지훈 (부산광역시 동래구 명륜동 쌍용예가아파트, 607-010 Busan, 607-010, KR)
KIM, Donghwan (# Jueun apartment, Songjung-dongHeungdeok-gu,Cheongju-si, Chungcheongbuk-do 361-290, 361-290, KR)
한국기계연구원 (대전 유성구 장동 171번지, 305-343 Daejeon, 305-343, KR)
YU, Ji-Hun (# Ssangyong Yega apartment, Myeongryun-dongDongrae-gu, Busan 607-010, 607-010, KR)
유지훈 (부산광역시 동래구 명륜동 쌍용예가아파트, 607-010 Busan, 607-010, KR)
KIM, Donghwan (# Jueun apartment, Songjung-dongHeungdeok-gu,Cheongju-si, Chungcheongbuk-do 361-290, 361-290, KR)
International Classes:
B22F1/00; B22F3/00; H01F1/053
Attorney, Agent or Firm:
LEE, Won Hee (8th Fl. Sung-ji Heights II, 642-16Yoksam-dong,Kangnam-ku, Seoul 135-080, 135-080, KR)
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