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RISS 인기검색어
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- 저자 : 김윤배(Y.B.KIM) (검색결과 98 건)
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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.
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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.
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NdxFe77B₂₃-x(4<x<13) 급속응고 합금의 자기특성
박우식(W. S. PARK),김윤배(Y. B. KIM),김희태(H. T. KIM),조용수(Y. S. CHO),김창석(C. S. KIM),박만장(M. J. PARK) 한국자기학회 1995 韓國磁氣學會誌 Vol.5 No.1
Nd_xFe_(77)B_(23-x)(x = 4, 6, 8, 11, 13) alloys were prepared by rapid quenching technique. They were crystallized at higher than 650℃ and subsequently the magnetic properties were investigated. The melt-spun alloy of x=8 consisted of nearly single metastable compound Nd₂Fe₂₃B₃ and showed the soft magnetic property. In 8≤x≤13 alloys, the coercivities were increased according to the increase of Nd content but the remanences decreased. In 4≤x≤6 alloys, the coercivities and the remanences were increased by lowering Nd content. In x = 4 alloy, the ratio of soft to hard magnetic phase was 70 : 30 and the energy product was 96 kJ / ㎥ (12MG.Oe).
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(Fe, Co) - B - Al - Nb 초미세 결정립합금의 제조 및 자기적 특성
조용수(Y. S. Cho),김윤배(Y. B. Kim),김창석(C. S. Kim),김택기(T. K. Kim) 한국자기학회 1993 韓國磁氣學會誌 Vol.3 No.3
Magnetic properties of (Fe, Co)-B-Al-Nb alloys prepared by rapid solidification process have been studied for the development of new type Fe based nanocrystalline alloy. Phases with α-Fe(Co) crystallities in amorphous matrix has been obtained directly from the rapid solidification by substituting 10 at. %Al for transition metal in (Fe._(85)Co._(15))_(80)B_(20) amorphous alloy. Addition of 2~6 at. % Nb to (Fe._(85)Co._(15))_(70)B_(20)Al_(20) alloy decrease saturation magnetostriction below 6 ppm, and improves soft magnetic properties. Heat treatment effects decrease with increasing Nb content. (Fe._(85)Co._(15))_(70)B_(18)Al_(10)Nb₂ alloy annealed at 400 ℃ during 1 hr shows structure composed of ultra-fine grains of about 8 ㎚ and the most improved magnetic properties among the prepared alloys. Saturation magnetic flux density, power loss and permeability(f=50 ㎑, Bm=0.2 T) of the alloy are 1.1 T, 12 W / ㎏ and 2.5×10⁴ respectively.
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α-Fe 기 Nd - Fe - B 급속응고합금의 자기특성
조용수(Y. S. Cha),김윤배(Y. B. Kim),박우식(W. S. Park),김희태(H. T. Kim),김창석(C. S. Kim),김택기(T. K. Kim) 한국자기학회 1994 韓國磁氣學會誌 Vol.4 No.2
The magnetic properties of Nd-Fe-B alloys of containing 4 at.% Nd have been studied for the development of new type rare-earth magnets. The amorphous phase of a melt-spun Nd₄Fe_(85.5)B_(10.5) alloy is transformed into the phases which have a small amount of Nd₂Fe₁₄B₁ in α-Fe matrix by annealing above their crystallization temperature. The addition of Mo, Nb, V or Cu to Nd₄Fe_(85.5)B_(10.5) alloy results in the reduction of grain size and the subsequent improvement of the coercivity. The coercivity of Nd₄Fe_(82)B_(10)M₃Cu₁(M = Mo, Nb, V) alloys increases in the order of M = V < Nb < Mo and shows the highest value of 2.7 kOe when M = Mo. On the other hand, the remanence of these alloys shows the opposite trend and the most improved value of 1.35 T is observed when M = V.
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Ndx(Fe0.9Co0.1)90-xB6Nb₃Cu₁(x=3, 4, 5) 초미세결정립합금의 자기특성
조용수(Y. S. Cho),김만중(M. J. Kim),천정남(Z. N. Qian),김택기(T. K. Kim),박우식(W. S. Park),김윤배(Y. B. Kim) 한국자기학회 1995 韓國磁氣學會誌 Vol.5 No.5
Magnetic properties of Nd_x(Fe_(0.9)Co_(0.1))_(90-x)B_6Nb₃Cu₁(X = 3, 4, 5) melt-spun alloys with 6 at% B content were studied aiming for finding out a new α-Fe based Nd-Fe-B nanocrystalline alloy with good hard magnetic properties. Nd_x(Fe_(0.9)Co_(0.1))_(90-x)B_6Nb₃Cu₁ melt-spun alloys prepared by RSP crystallized to nanocrystalline phase. An optimally annealed Nd₃(Fe_(0.9)Co_(0.1))_(87)B_6Nb₃Cu₁ melt-spun alloys had larger volume ratio of α-Fe (Co) than that of higher Nd content alloy and showed high remanence of about 1.6 T. On the contrary, the increase of Nd content in Nd_x(Fe_(0.9)Co_(0.1))_(90-x)B_6Nb₃Cu₁ alloys gave rise to gradual increase of an amount of Nd₂(Fe, Co)₁₄B phase and improved coercivity. An optimally annealed Nd_5(Fe_(0.9)Co_(0.1))_(85)B_6Nb₃Cu₁ alloy showed the most improved hard magnetic properties. The remanence, coercivity and energy product of the alloy were 1.35 T, 219 ㎄/m (2.75 kOe), and 129 kJ/㎥ (16.2 MGOe), respectively.
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