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논문 기본 정보

자료유형
학술저널
저자정보
Sangjun Lee (Pusan National University) Jeehye Kwon (Pusan National University) Hee-Ryoung Cha (Korea Institute of Machinery & Materials) Kyung Min Kim (Pukyong National University) Hae-Woong Kwon (Pukyong National University) Junggoo Lee (Korea Institute of Machinery & Materials) Dongyun Lee (Pusan National University)
저널정보
대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.22 No.2
발행연도
2016.1
수록면
340 - 344 (5page)

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We report an enhancement in the coercivity of sintered Dy free Nd-Fe-B magnets from 11.84 to 14.26 kOe by the grain-boundary diffusion of electrochemically deposited Cu-Nd. In the optimized electrochemical deposition and heat treatment conditions, a distinct Nd-rich grain-boundary phase was observed after the diffusion process; distributions of each element was carefully mapped by scanning electron microscopy equipped with backscattered electron detector. X-ray diffraction patterns indicated that Nd2Fe14B was oxidized by the inward diffusion of oxygen, which might be formed during the electrodeposition of Cu-Nd, forming antiferromagnetic Fe2O3 that might degrade the overall coercivity. A mechanism underlying the enhancement of coercivity is basically the same as the well-known proposed mechanism, distribution of a thin Nd-rich phase by grain-boundary diffusion process. In this study, electrochemical deposition process has been extensively investigated, and then the process was demonstrated to be successful and economically useful method to improve coercivity of the magnet.

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