Development of permanent magnets using low cost mischmetal

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High-throughput (HiTp) synthesis and rapid characterization was used to identify permanent magnet alloy compositions with decreased critical material content.
High-throughput (HiTp) synthesis and rapid characterization was used to identify permanent magnet alloy compositions with decreased critical material content. 

CMI scientists at Ames Laboratory conducted this research.

Achievement

High-throughput (HiTp) synthesis and rapid characterization was used to identify permanent magnet alloy compositions with decreased critical material content

Significance and impact

  • Domestic RE deposits have large amounts of Ce/La-rich mischmetal that is much cheaper than separated Nd and Dy. mischmetal based magnets usually show poor properties (e.g., low Tc)
  • HiTp synthesis using LENS has allowed rapid identification of potential mischmetal based magnet alloys. Alloys prepared by melt-spinning show enhanced Tc  of ~475°C, with  Hc~ 5kOe and (BH)max~10 MGOe

Details

  • Mischmetal is unseparated RE elements that consists of mostly Ce and La
  • Could reduce Nd and Dy usage, but typically has low Tc
  • Using HiTp additive manufacturing synthesis, we identified compositions with high Tc ( ~ 475 °C), while minimizing Nd and Co contents