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http://dx.doi.org/10.4283/JKMS.2002.12.2.057

Improvement of Magnetic Properties of Nd-Fe-B Type Sintered Magnet  

Kim, Yoon-B. (한국과학기술연구원 금속공정연구센터)
Jung, W.S. (한국과학기술연구원 금속공정연구센터)
Jeung, W.Y. (한국과학기술연구원 금속공정연구센터)
Publication Information
Journal of the Korean Magnetics Society / v.12, no.2, 2002 , pp. 57-63 More about this Journal
Abstract
In order to increase the magnetic properties of a Nd-Fe-B sintered magnet, the general factors including particle size and its distribution, volume fraction of Nd$_2$Fe$_{14}$B phase, degree of alignment of Nd$_2$Fe$_{14}$B grain, oxygen content and grain size etc. should be optimized by controlling the composition of Nd-Fe-B alloy as well as the manufacturing process. In this study, fabrication of the Nd-Fe-B sintered magnet was carried out in a laboratory scale by controlling the composition of Nd-Fe-B alloy and the manufacturing process. The optimum milling condition was found by investigating the milling media, milling time and ball size. The addition of FeGa was effective to increase the coercivity of the Nd-Fe-B sintered magnet. A remanence of 14.4 kG, a coercivity of 9.4 kOe and a maximum energy product of 47 MGOe were obtained from the sintered magnet.
Keywords
Nd-Fe-B sintered magnet; magnetic property; Ball mill; Powder blending; Dry milling;
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