About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
Advances in Magnetic Materials
|
Presentation Title |
Grain Boundary Engineering for High Performance Heavy Rare-Earth Free Permanent Magnets |
Author(s) |
Matthew J. Kramer, Wei Tang, Gaoyuan Ouyang, Jun Cui, Iver Anderson |
On-Site Speaker (Planned) |
Matthew J. Kramer |
Abstract Scope |
Widespread adoption of electric vehicles will require efficient high power density electric drive motors. The most efficient motors are based on permanent magnets (PM), 10 to 15% better than induction machines with comparable power. Meeting the projected demand for these electric vehicles (EV) with current Nd-based PM will require more than 2x increase in production by 2030 and at least 3x by 2040. However, Nd-Fe-B based magnets without heavy rare earth elements (HREE) have poor magnetic properties above 150°C, target operating temperature for most electric vehicles (EV). It is well established that the coercivity is sensitive to grain boundary structure, grain boundary chemistry, and grain size. We will discuss development of grain boundary engineering approaches to produce HREE free Nd-Fe-B magnets include grain boundary diffusion by doping with a low melting point compounds, and grain size reduction and techniques to passivate these fine grain-sized powders to increase operating temperatures. |
Proceedings Inclusion? |
Planned: |
Keywords |
Magnetic Materials, Surface Modification and Coatings, Powder Materials |