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Coercivity Enhancement in Nd2Fe14B Permanent Magnetic Powders through Rotating Diffusion Process with DyHx Powders

Journal of Magnetics, Volume 16, Number 4, 31 Dec 2011, Pages 342-349
Moonhee Choi (Energy Materials Lab., School of Materials Science and Engineering, Pusan National University), Jihun Yu (Functional Materials Powder Technology Group, Korea Institute of Material Science), Donghwan Kim (Functional Materials Powder Technology Group, Korea Institute of Material Science), Inbae Kim (Energy Materials Lab., School of Materials Science and Engineering, Pusan National University), Yangdo Kim * (Energy Materials Lab., School of Materials Science and Engineering, Pusan National University)
Abstract

Nd2Fe14B permanent magnetic powders (iHc = 9.2 kOe, Br = 12.2 kG) were produced by HDDR process. Their coercivity was e hanced to 12.6 kOe through the grain boundary diffusion process with dysprosium hydride (DyHx). DyHx diffusion process was optimized through rotating diffusion process, resulting in distinct phases rich in Nd and Dy observable by field emission scanning microscopy and transmission electron microscopy. The mechanism of coercivity enhancement that resulted in restrain the coupling effect between Nd2Fe14B grains is also discussed.

 

Keywords: Nd2Fe14B; permanent magnet; diffusion process
DOI: http://dx.doi.org/10.4283/JMAG.2011.16.4.342
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