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Nd - Fe - B계 소결자석의 자기적특성 향상 연구
김윤배(Yoon B. Kim),정우상(W.S. Jung),정원용(W.Y. Jeung) 한국자기학회 2002 韓國磁氣學會誌 Vol.12 No.2
In order to increase the magnetic properties of a Nd-Fe-B sintered magnet, the general factors including particle size and its distribution, volume fraction of Nd₂Fe₁₄B phase, degree of alignment of Nd₂Fe₁₄B grain, oxygen content and grain size etc. should be optimized by controlling the composition of Nd-Fe-B alloy as well as the manufacturing process. In this study, fabrication of the Nd-Fe-B sintered magnet was carried out in a laboratory scale by controlling the composition of Nd-Fe-B alloy and the manufacturing process. The optimum milling condition was found by investigating the milling media, milling time and ball size. The addition of FeGa was effective to increase the coercivity of the Nd-Fe-B sintered magnet. A remanence of 14.4 kG, a coercivity of 9.4 kOe and a maximum energy product of 47 MGOe were obtained from the sintered magnet.
압출 성형에 의한 이방성 Sr - 페라이트 본드 자석의 자기적 특성
박범식(B. S. Park),김윤배(Yoon B. Kim),정원용(W. Y. Jeung) 한국자기학회 1996 韓國磁氣學會誌 Vol.6 No.5
In this study magnetic properties of anisotropic ferrite bonded magnets produced by extrusion molding with a variety of magnetic field, extrusion mold temperature and extrusion rate were investigated. X-ray diffraction study showed the alignment of magnetic powder was decreased by molten flow in extrusion mold. When the temperature of extrusion mold was 20 ℃, the degree of alignment as much as 82 % could be achieved under the applied magnetic field of 4 kOe. The bonded magnets having the remanence of 2.2 kG was able to fabricated by extrusion molding when the packing density of Sr-ferrite powder was 50 vol %.