About this Abstract |
Meeting |
2021 TMS Annual Meeting & Exhibition
|
Symposium
|
Advanced Magnetic Materials for Energy and Power Conversion Applications
|
Presentation Title |
Scale-up Production on MnBi Magnet with High Performance |
Author(s) |
Wei Tang, Gaoyuan Ouyang, Xubo Liu, Baozhi Cui, Kevin W Dennis, Jun Cui |
On-Site Speaker (Planned) |
Wei Tang |
Abstract Scope |
This work presents a new roadmap towards the large-scale fabrication of MnBi magnets. Feedstock powder was fabricated by melt-spun ribbons through prolonged annealing and low energy ball milling processes. The feedstock powders obtained H<Sub>cj</Sub> of 12.3 kOe and maximum energy product, (BH)<Sub>max</Sub>, of 13.2 MGOe. Bulk magnets were made through magnetic alignment, pre-pressing, cold isostatic pressing, and warm-sintering. Our study revealed that a non-ferromagnetic second phase must be present at the grain boundary to retain the high H<Sub>cj</Sub> in the bulk magnet. The second phase was introduced by either in-situ or ex-situ method. Additionally, the warm-sintering with a magnetic field further improved the magnetic properties of bulk magnets. A bulk magnet with H<Sub>cj</Sub> of 6.4 and 18.7 kOe, and (BH)<Sub>max</Sub> of 8.9 and 7.5 MGOe at 25 and 150ºC, respectively, was obtained. The newly developed technical routes could commercially produce high purity powder and bulk magnets with high magnetic performance. |
Proceedings Inclusion? |
Planned: |