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ThMn₁₂ 형 Sm - Fe - Ti 급냉응고리본의 미세구조 및 자기특성
김윤배(Y.B.Kim),유권상(K.S.Ryu),김동환(D.H.Kim),김창석(C.S.Kim) 한국자기학회 1991 韓國磁氣學會誌 Vol.1 No.1
It has been found that the as-quenched ribbons of Sm_xFe_(100-x-y)Ti_y(3.8 ≤ x ≤ 11.5, 3.8 ≤ y ≤ 19.2) are composed of metastable TboCu_7-type structure, α-(Fe, Ti), Fe₂Ti and an unknown phase accompanying strong diffraction line at d=2.l4 Å. The metastable TbCu_7-type phase, which was formed by rapid quenching, did not transform fully to the stable phases after annealing at 850℃ for 45 minutes except the one existed in SmFe₁₁Ti melt-spun ribbon. The SmFe₁₁Ti melt-spun ribbon, annealed at 850℃ for 45 minutes in vacuum, was found to be composed of ThMn₁₂, α-(Fe, Ti) and Fe₂Ti phases. The formation of α-(Fe, Ti) and Fe₂Ti phases in this melt-spun ribbon was due to the evaporation of Sm atoms during the high temperature annealing. The atomic ratios for the surface and the inside of SmFe₁₁Ti melt-spun ribbon annealed in vacuum were SmFe_(25.8)Ti_(2.6) and SmFe_(11.7)Ti_(1.0) respectively. It is thought to be that much of α-(Fe, Ti) and Fe₂Ti phases exist on the surface of ribbon.
고특성 Nd₁₂Fe80B6(Nb, M) (M=Ti / Cu / Ga)급속응고리본의 자기특성
김윤배(Y. B. Kim),김창석(C. S. Kim),김동환(D. H. Kim),이갑호(K. H. Lee),김택기(T. K. Kim) 한국자기학회 1992 韓國磁氣學會誌 Vol.2 No.1
Magnetic properties and microstructures of Nd₁₂Fe_(80)B_6(Nb, M) (M=Ti/Cu/Ga) melt-spun ribbons prepared by single wheel technique have been studied. The results of microstructural study have shown that Ga is effective for the orientation of c-axis normal to the ribbon plane. The Ga-added melt-spun ribbon, Nd₁₂Fe_(80)B_6(Nb, Ga), quenched at Vs=17.9 ㎧ was mostly composed of fine grains of about 30 ㎚ in size with the textured free-side surface. The powder of this ribbon aligned in magnetic field showd a high remanence of 0.87 T which was about 5% higher than that of ribbon itself. It is believed that there is a possibility to fabricate a new type of HIREM melt-spun ribbon with highly textured free-side surface.