| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Magnetism and Magnetic Materials
|
| Presentation Title |
A Study on the Improvement of Coercivity of Nd-Fe-B Permanent Magnets by GBDP of Ternary Alloy |
| Author(s) |
Hyun Bin Joo, Seung-Yeon Park, Seong Min Choi, Se Rin Jeong, Soong Ju Oh, Kyoung-Mook Lim |
| On-Site Speaker (Planned) |
Hyun Bin Joo |
| Abstract Scope |
The problem with Nd-Fe-B permanent magnets, which are mainly used to increase the energy conversion efficiency of motors, is that their magnetic properties rapidly decrease at high temperature. Therefore, a grain boundary diffusion process (GBDP) is mainly used to increase thermal stability through the improvement of coercivity by replacing a heavy rare earth element (HREE) such as Dy with Nd.
Therefore, in this study, a low melting point alloy was added to facilitate grain boundary diffusion of HREE. First, a pre-treatment process was performed at 700°C, which is a temperature below the melting point of the Dy-Al-Cu ternary alloy used as a diffusion source. Thereafter, a grain boundary diffusion process at 900-950°C and a heat treatment at 500°C were performed. As a result, it was confirmed that the composition of the diffusion source with the highest magnetic properties differed according to the grain boundary diffusion temperature. |
| Proceedings Inclusion? |
Planned: |