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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).
고잔류자화 α-Fe기 Nd-Fe-B 초미세결정립 합금의 자기특성
조용수(Y. S. Cho),김윤배(Y. B. Kim),박우식(W. S. Park),김창석(C. S. Kim),김택기(T. K. Kim) 한국자기학회 1995 韓國磁氣學會誌 Vol.5 No.1
The effects of Nb and Cu additives as will as substitutional Co into Nd₄Fe_(85.5)B_(10.5) melt-spun alloy were studied aiming for finding a α-Fe based Nd-Fe-B composite alloys with high energy product. The addition of Nb and Cu to Nd₄Fe_(85.5)B_(10.5) decreased the average grain size and increased the coercivity up to 207㎄/m(2.6kOe). Furthermore, the substitution of Co for Fe in Nd₄Fe_(82)B_(10)Nd₃Cu₁ alloy resulted in the decrease of the average grain size (< 2O㎚) and improved the hard magnetic properties. The remanence, coercivity and energy product of optimally annealed Nd₄Fe_(74)Co_8B_(10)Nb₃Cu₁ alloy were 1.345, 219㎄/m(2.75kOe) and 95.5kJ/㎥ (12MGOe), respectively.