|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Materials Science for High-Performance Permanent Magnets
||Coercivity Enhancement of Hot-deformed NdFeB Magnets by GBDP with NdHx and Metallic Nanoparticles
||Junggoo Lee, Heeryoung Cha, Younkyoung Baek, Jihun Yu, Haewoong Kwon
|On-Site Speaker (Planned)
Recently, much attention has been focused on HRE-free high coercive NdFeB magnets. Hot deformation has been proven quite useful to achieve this goal. However, hot-deformed magnets exhibit a very large specific interfacial area per unit volume due to ultra-fine grain size. So it is significantly important to control the phase along the interfacial area after hot-deformation to achieve high coercivity. In this study, NdHx and metallic nanopowder were employed for grain boundary diffusion process (GBDP). For GBDP, NdHx and metallic nanopowder were mixed in ethanol as diffusion source. The hot-deformed samples were dipped into diffusion source. After dried, the dip-coated samples were heat treated at 550 - 700℃ for GBDP. GBDP at lower temperature resulted in higher enhancement of coercivity with the same amount of Nd-Cu source. In addition, the GBDPed sample showed weak dependence of the coercivity on the grain alignment.