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Nd - Fe - B계 소결자석의 이방화율 향상을 위한 연구
김동환(D. H. Kim),임광윤(K. Y. Lim),김효준(H. J. Kim),조재완(J. H. Jo),서응석(E. S. Seo),김승호(A. S. Kim),김상면(S. M. Kim) 한국자기학회 2001 韓國磁氣學會誌 Vol.11 No.1
Effects of casting processes and lubricant addition were studied to improve remanence of 31 RE-68TM-1B based sintered magnet by using axial pressing process. Strip casting was effective to get the fine and homogeneous microstructure without α-Fe segregation. The strip cast flake resulted in narrower particle size distribution after jet milling with respect to the conventional cast ingot. During pressing step with a magnetic field, the particle alignment was increased by appropriate addition of liquid lubricant. In this study, it was revealed that narrow particle size distribution and appropriate addition of liquid lubricant were essential to improve the grain alignment and thus the remanence of Nd-Fe-B sintered magnet.
희토류 자원분쟁과 NdFeB계 이방성 본드자석 개발동향
김효준(H. J. Kim),김상면(S. M. Kim) 한국자기학회 2012 韓國磁氣學會誌 Vol.22 No.3
NeFeB anisotropy bonded magnet has proposed a new paradigm of weight reduction of small motors by replacing the conventional ferrite permanent magnets with its high magnetic property of 25 MGOe during last five years. It has also advanced by leaps and bounds in the field of motor industry for automobiles and electric power tools. And it has led a new innovation of fifty percent weight lightening compared to its current motors by correctly focusing on fuel performance improvement through weight lightening that automobile industry chased. There was, however, another price skyrocketing in 2011 after China had announced its export regulation in rare earth materials in July, 2010. And this price change has an extensive impact on the industries that consume rare earth magnets. This environmental change has caused technical challenge to improve the performance by using least amount of rare earth elements in NdFeB anisotropy bonded magnets, and led to make a new technical approach to a new applied field. In this article, we will show how each nation deals with this industrial issue, and introduce development trend and application of anisotropic NdFeB bonded magnets, so-called MAGFINE made by Aichi Steel Corp.