| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
New Directions in Mineral Processing, Extractive Metallurgy, Recycling and Waste Minimization: An EPD Symposium in Honor of Patrick R. Taylor
|
| Presentation Title |
D-30: In-situ Microscopy Observations of Oxide Phases Formation during High-temperature Oxidation of End-of-life Ni/Cu/Ni-coated-NdFeB Permanent Magnets |
| Author(s) |
Deddy Chandra Nababan, Reiza Mukhlis, Yvonne Durandet, Mark I. Pownceby, Leon Prentice, M. Akbar Rhamdhani |
| On-Site Speaker (Planned) |
Deddy Chandra Nababan |
| Abstract Scope |
An understanding of the reaction phases formed during the high-temperature oxidation of rare earth permanent magnets (REPM) is vital for developing appropriate strategies for their pyrometallurgy-based recycling processes aimed at the concentration and potential recovery of the rare earth elements (REEs). The current study uses in-situ high-temperature optical microscopy combined with ex-situ scanning electron microscopy to analyze oxide growth on the surface of an end-of-life Ni/Cu/Ni-coated NdFeB permanent magnet oxidized at 1173 K and 1473 K for up to 4 hours under ambient air conditions. Distinct oxide morphologies were observed at the two oxidation temperatures over time, ranging from porous, spherulitic, and spike-like structures. At the longest oxidation times, visible cracking of the surface of the magnet and protrusion of Fe2O3 and Nd2O3 phases were observed. The presence of a Ni/Cu/Ni coating on the magnets was found to significantly affect the oxidation growth. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Recycling and Secondary Recovery, |