Article Toward Maximum Utilization of Heavy Rare Earths in Sintered Nd–Fe–B Magnets by Grain Boundary Diffusion Source and Application Area Optimization

Abdullatif Durgun ; Dominik Ohmer ORCID ; Matthias Katter ; Andreas Thul ORCID ; Simon Steentjes ORCID ; Hossein Sepehri Amin SAMURAI ORCID ; Oliver Gutfleisch ORCID ; Imants Dirba ORCID

Adv Eng Mater - 2025 - Durgun - Toward Maximum Utilization of Heavy Rare Earths in Sintered Nd Fe B Magnets by Grain.pdf
Download file (2.45 MB)
Download as zip (2.12 MB)
Collection

Citation
Abdullatif Durgun, Dominik Ohmer, Matthias Katter, Andreas Thul, Simon Steentjes, Hossein Sepehri Amin, Oliver Gutfleisch, Imants Dirba. Toward Maximum Utilization of Heavy Rare Earths in Sintered Nd–Fe–B Magnets by Grain Boundary Diffusion Source and Application Area Optimization. Advanced Engineering Materials. 2025, (), e202501145. https://doi.org/10.1002/adem.202501145

Description:

(abstract)

The study focuses on reducing costly heavy rare earth (HRE) elements Dy and Tb in NdFeB magnets while maintaining high coercivity for electric motors. By optimizing the grain boundary diffusion process (GBDP) with TbHx and Tb-containing alloys, researchers achieved highly efficient Tb utilization. A normalized coercivity gain of 3866 kA/m/wt% Tb (4.86 T/wt% Tb) was obtained with minimal remanence loss (1.45 T to 1.43 T). This approach enables HRE-balanced, high-performance magnets for sustainable e-motor applications.

Rights:

Keyword: Permanent Magnet, Nd-Fe-B, Coercivity, Diffusion process

Date published: 2025-09-26

Publisher: Wiley

Journal:

  • Advanced Engineering Materials (ISSN: 14381656) e202501145

Funding:

  • Deutsche Forschungsgemeinschaft 405553726
  • Bundesministerium für Bildung und Forschung 03VP10552

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.1002/adem.202501145

Related item:

Other identifier(s):

Contact agent:

Updated at: 2025-09-30 12:30:19 +0900

Published on MDR: 2025-09-30 12:18:38 +0900

Filename Size
Filename Adv Eng Mater - 2025 - Durgun - Toward Maximum Utilization of Heavy Rare Earths in Sintered Nd Fe B Magnets by Grain.pdf (Thumbnail)
application/pdf 		Size 2.45 MB Detail