Inward Diffusion of Tb Ions and the Magnetic Properties of the Nd-Fe-B Magnets
열처리 조건에 따른 Tb이온의 확산 및 Nd-Fe-B 자석의 자기적 특성

Seong-Uk Oh, Dong-Whan Kim, Gun-Seung Gong, Young-Woo Heo, Jeong-Joo Kim, Joon-Hyung Lee
2017 Journal of the Korean Institute of Electrical and Electronic Material Engineers  
In this study, the effect of Tb inward diffusion on the magnetic properties of the Nd-Fe-B sintered magnets was studied. After sintering of the magnets, TbF 3 slurries were dip-coated on the surface of the samples, then heat-treatment was followed for TbF 3 diffusion. The element distribution in the magnets and the diffusion profiles of Tb ions were analyzed by an EPMA (electron probe micro-analyzer). Prolonged heat treatment resulted in a deeper diffusion length of Tb ions. Coercivity of the 1
more » ... st heat-treated sample showed 21.86 kOe, while that of the 1 st , 2 nd heat-treated and annealed sample revealed 34 kOe.
doi:10.4313/jkem.2017.30.1.27 fatcat:uxlcqzlumbeubbelpsxp2pw3qm