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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).
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.
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.