발간논문

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Vol.24, No.4, 532 ~ 540, 1986
Title
Magnetic Properties of Nd - Fe - B System Permanent Magnet
정원용Won Young Jeung, 최승덕Seung Dueg Choi, 오재현Jae Hyun Oh, 강일구Il Koo Kang
Abstract
Effects of neodymium content, particle size, sintering and heat treatment on magnetic properties of Nd-Fe-B system permanent magnets were investigated. In the study, the best magnetic properties were achieved for the magnets containing 33 wt% Nd in the Nd-Fe-1.3B system. An energy product of up to 37 MGOe has been resulted. The highest coercivity was observed when the average particle size was about 3㎛. When the content of Nd was less than 31 wt%, the coercivity was not exhibited. It was also observed that very little sintering has taken place due to lack of Nd-rich phase with in the Nd-Fe-1.3B system. The absence of coercivity was due to easy nucleation of reverse domains with in the irregular shape of grains in the sintered body.
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