Development of Improved Powder for Bonded Permanent Magnets


Project Leader(s):
Iver Anderson

Principal Investigators:
Iver Anderson, Vladimir Antropov, Bruce Harmon, Kai-Ming Ho, Matthew Kramer, R. William McCallum, Cai-Zhuang Wang


This project has three main objectives.

  1. Develop high performance permanent magnets (PM) for traction motor with internal PM rotor:
    • requires elevated temperature (180-200°C) operation, minimize cooling needs
    • increased high temperature magnetic performance more critical than RT
  2. Reduce manufacturing cost of PM traction motors:
    • bonded PM can utilize injection or compression molding technology
      • net shape forming for mass production of rotors
  3. Achieve high performance and reliability for bonded magnets:
    • increase volumetric loading
    • minimize irreversible magnetic losses (oxidation)


Xiong X Y; Rong C B; Rubanov S; Zhang Y; Liu J P . 2011. Atom probe study on the bulk nanocomposite SmCo/Fe permanent magnet produced by ball-milling and warm compaction. Journal of Magnetism and Magnetic Materials. 323:2855-2858. abstract
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Rong C B; Zhang Y; Poudyal N; Szlufarska I; Hebert R J; Kramer M J; Liu J P . 2011. Self-nanoscaling of the soft magnetic phase in bulk SmCo/Fe nanocomposite magnets. Journal of Materials Science. 46:6065-6074. abstract
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Rong C B; Zhang Y; Poudyal N; Wang D P; Kramer M J; Liu J P . 2011. Bulk SmCo5/alpha-Fe nanocomposite permanent magnets fabricated by mould-free Joule-heating compaction. Journal of Applied Physics. 109:07a735. abstract
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Wu Y Q; Tang W; Dennis K W; Oster N; McCallum R W; Anderson I E; Kramer M J . 2011. Effective grain pinning revealed by nanoscale electron tomography. Journal of Applied Physics. 109:07a705. abstract
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Tang W; Wu Y Q; Dennis K W; Oster N T; Kramer M J; Anderson I E; McCallum R W . 2011. Studies of microstructure and magnetic properties in sintered mixed rare earth (MRE) -Fe-B magnets (MRE = Nd plus La plus Dy). Journal of Applied Physics. 109:07a704. abstract
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Wei X; Le Roy D; Skomski R; Li X Z; Sun Z; Shield J E; Kramer M J; Sellmyer D J . 2011. Structure and magnetism of MnAu nanoclusters. Journal of Applied Physics. 109:07b523. abstract
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Rong C B; Zhang Y; Kramer M J; Liu J P . 2011. Correlation between microstructure and first-order magnetization reversal in the SmCo5/alpha-Fe nanocomposite magnets. Physics Letters A. 375:1329-1332. abstract
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Shand P M; Schmitter D C; Rojas G; Shield J E; Goertzen J; Meyer A L; Pekarek T M; Kramer M J; Leslie-Pelecky D L . 2011. Correlating structure with ferromagnetism in melt-spun Gd100-xFex. Journal of Alloys and Compounds. 509:3000-3005. abstract
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Tang W; Wu Y Q; Oster N T; Dennis K W; Kramer M J; Anderson I E; McCallum R W . 2010. Improved energy product in grained aligned and sintered MRE2Fe14B magnets (MRE=Y plus Dy plus Nd). Journal of Applied Physics. 107:09a728. abstract
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Wu Y Q; Tang W; Kramer M J; Dennis K W; Oster N; McCallum R W; Anderson I E . 2009. Correlation of the energy product with evolution of the nanostructure in the Y,Dy,Nd-(Fe, Co)-B magnetic alloy. Journal of Applied Physics. 105:07a720. abstract
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