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http://dx.doi.org/10.4150/KPMI.2012.19.4.247

Effect of Cu and DyF3 Powder Additions on the Coercivity of Sintered Nd-Fe-B Magnets  

NamKung, S. (Department of Materials and Metallurgical Engineering, Graduate School, Sunmoon University)
Lee, M.W. (Department of Materials and Metallurgical Engineering, Graduate School, Sunmoon University)
Dhakal, D.R. (Department of Materials and Metallurgical Engineering, Graduate School, Sunmoon University)
Lim, T.H. (Department of Materials and Metallurgical Engineering, Graduate School, Sunmoon University)
Kim, T.H. (Department of Materials Science and Engineering, Korea University)
Lee, S.R. (Department of Materials Science and Engineering, Korea University)
Jang, T.S. (Department of Materials and Metallurgical Engineering, Graduate School, Sunmoon University)
Publication Information
Journal of Powder Materials / v.19, no.4, 2012 , pp. 247-252 More about this Journal
Abstract
Effect of Cu and $DyF_3$ powder mixing with Cu-free (Nd, Dy)-Fe-B jet-milled powder on the magnetic properties of sintered magnets was investigated. The coercivity of a magnet prepared from the Cu-free (Nd, Dy)-Fe-B powder was about 10 kOe even though the alloy powder already contained some Dy (3.5 wt%). When small copper powder was blended, however, the coercivity of the magnet increased almost 100%, exhibiting about 20 kOe. On the contrary, the coercivity enhancement was moderate, about 4 kOe, when dysprosium content in the sintered magnet was simply increased to 4.9 wt% by the addition of small $DyF_3$3 powder.
Keywords
Cu; $DyF_3$; Magnetic property; Nd-Fe-B; Sintered magnet;
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