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급속냉각 및 열간성형기술에 의해 제조된 Fe-Nd-B 영구자석
양충진,최승덕 대한금속재료학회(대한금속학회) 1989 대한금속·재료학회지 Vol.27 No.10
The hot-working behavior of rapidly solidified Fe-Nd-B powders was investigated to utilize the hot consolidation techniques in direct fabricating a promising permanent magnet. The examination of stress-strain distribution of both the mandrel extruded ring magnet and the pack rolled magnet enlightens the source of prominent magnetic anisotropy of those hot consolidated magnet bars. It has been confirmed that the maximum normal strain during hot deformation causes the Fe_(14)Nd₂B grains with their c-axes to be aligned parallel to the strain direction resulting in the enhanced remanent magnetization. The highest remanence of Br=8.6 kG was observed along the through-thickness direction of the ring magnet, and of Br=6.9 kG for the pack rolled magnet along the thickness direction. A(001)[1 ̄10] texture was found to form in the plane normal to the thickness direction of pack rolled magnet bar. The maximum energy product about 10∼11 MGOe was obtained from the hot consolidated Fe-Nd-B magnet deformed in true strain ε_u = 1.0 range.
(Fe-Co-Nd-B) + ZrB2 계 영구자석 합금의 자기특성
이우영,양충진,최승덕 대한금속재료학회(대한금속학회) 1990 대한금속·재료학회지 Vol.28 No.6
The magnetic properties of Fe-Co-Nd-B magnet were examined using rapidly solidified amorphous powders of Nd (Fe_(0.92)-xCo_xB_(0.08))_(5.5)+y wt% ZrB₂composition. Magnets were prepared by sintering the crystallized powders, and cold isostatic pressing followed by sintering. In the as-spun magnet alloys, coercivity increases as the y increases up to x=0.17 when B/Nd ratio is constant. However, above the x=0.22, the maximum coercivity was obtained when y=2 and iHc=17.4 kOe at that composition. Curie temperature has been found to increase almost linearly with the addition of Co in the range of x=0.07∼0.22, and the maximum Tc was 491℃ when x=0.22. Laves phase, Nd(Fe_(0.5)Co_(0.5))₂always form in the sintered magnet(where x > 0.17) prepared by both powder metallurgy process and cold isostatic pressing followed by sintering.
정원용,오재현,강일구,최승덕 대한금속재료학회(대한금속학회) 1986 대한금속·재료학회지 Vol.24 No.4
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.