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| Magnetic Properties and Microstructure of Nanocrystalline NdFeB Magnets Fabricated by a Modified Hot Working Process |
| Journal of Magnetics, Volume 7, Number 4, 31 Dec 2002, Pages 138-142 |
Hyoung-Tae Kim(Research Center of Advanced Material Development, Chonbuk Natl Univ. Korea Research Institute of Standards and Science), Yoon-Bae Kim*  (Korea Research Institute of Standards and Science), G.A Kapustin(RRC,Kurchatov institute), Woo-Yong Jeon(Kwangyang Colledge), Hak-Shin Kim(Research Center of Advanced Material Development, Chonbuk Natl Univ.) |
| Abstract |
| Magnetic properties, microstructure and texture of NdFeB magnets fabricated by a modified hot working process from commercial melt-spun powders (Magnequench; MQPA, MQPB and MQPB＋) have been investigated. The hot-pressed isotropic magnet made from MQPA powder, which contains higher Nd content than that of MQPB or MQPB＋, shows higher coercivity. The magnet also shows homogenous and fine grains with higher coercivity for higher consolidation pressure. The hot-deformed MQPA magnet shows a strong anisotropy along the press direction with homogeneous platelet Nd2Fe14B grains of 50∼100nm in thickness and 200∼500nm in length. The hot-deformed MQPB＋ magnet, however, shows low remanence and low coercivity. The microstructure of the magnet consists of two areas; undeformed Nd2Fe14B grains and well-aligned but large grains with 3∼4 ㎛ in length. Low Nd content attributes to the formation of the two different area. |
| Keywords: CAPA process; NdFeB magnet; Hot press; Hot deformation; permanent magnet |
| DOI: |
| Full Text: PDF |
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