| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Magnetism and Magnetic Materials
|
| Presentation Title |
Recycling of Nd-Fe-B Magnets through Grain Boundary Diffusion with Rare Earth Fluorides |
| Author(s) |
Ikenna Nlebedim, Xubo Liu |
| On-Site Speaker (Planned) |
Ikenna Nlebedim |
| Abstract Scope |
We will present a work on grain boundary diffusion process (GBDP) for Nd-Fe-B magnet recycling. The waste magnets were coated with/without REF3 (RE=Y, La, Ce, Nd and Dy) and annealed between 600-900°C for 2hr. Coercivity was improved from 11 to 14kOe (without GBDP) for all the samples annealed at 600°C. However, at 800°C, coercivity became sensitive to the type of RE. For Y and Ce, the coercivity was comparable (10kOe) to the sample that was only annealed at 800°C, without GBDP. The sample treated with Nd has coercivity comparable to the initial waste magnet (11.5kOe). For La and Dy, coercivity sharply reduced and enhanced, respectively. Samples treated at 900°C had a similar trend. The result is due to the partitioning of each type of RE in Nd-Fe-B during annealing process under different temperature due to RE segregation. Optimized annealing and/or GBDP are promising approaches for reusing waste Nd-Fe-B magnets. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Magnetic Materials, Sustainability, Other |