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http://dx.doi.org/10.4150/KPMI.2011.18.1.018

The Coercivity Enhancement of (Nd,Dy)-Fe-B Sintered Magnet by Microstructure Control  

Kim, Jin-Woo (Department of Materials Science and Engineering, Hanyang University)
Kim, Se-Hoon (Department of Materials Science and Engineering, Hanyang University)
Kim, Young-Do (Department of Materials Science and Engineering, Hanyang University)
Publication Information
Journal of Powder Materials / v.18, no.1, 2011 , pp. 18-23 More about this Journal
Abstract
Sintered Nd-Fe-B magnets are widely used in many fields such as motors, generators, actuators, microwaves and so on due to their excellent magnetic properties. Many researchers have shown that the Nd-rich phase was essentially important for high magnet properties. In this study, we focused on controlling of the Nd-rich phase to enhance magnetic properties by the cyclic sintering process. Nd-Fe-B based sintered magnets were prepared by isothermal sintering and cyclic sintering processes. Magnetic properties and microstructure of the magnets were investigated. The coercivity was enhanced from 21.2 kOe to 23.27 kOe after 10 cycles of the sintering. The Nd-rich phase was effectively penetrated into the grain boundary between the $Nd_2Fe_{14}B$ grains by the cyclic sintering.
Keywords
Nd-Fe-B magnets; Nd-rich phase; Isothermal sintering; Cyclic sintering; Coupling effect;
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Times Cited By KSCI : 2  (Citation Analysis)
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