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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.