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Binder-free cold spray deposition of NdFeB permanent magnets

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Abstract

Cold spray deposition is employed to manufacture binder-free Nd2Fe14B permanent magnets. Millimeter thick deposits can be fabricated in seconds on substrates such as glass or copper. The Nd2Fe14B particles appear to partially embed in the substrate and interlock with one another, building up a dense layer that is consolidated by subsequent impacts. The impact and subsequent heating of the particles leads to formation of a magnetically soft phase that significantly reduces coercivity, X-ray diffraction identifies it as Fe. This can be mitigated by reducing gas velocity and temperature, leading to a partial retention of magnetic properties.

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Acknowledgments

Funding for this project was through the Office of Technology Transition’s Technology Commercialization Fund (TCF). This article has been authored by Lawrence Livermore National Security, LLC under Contract No. DE-AC52-07NA27344 with the U.S. Department of Energy. Accordingly, the United States Government retains and the publisher, by accepting the article for publication, acknowledges that the United States Government retains a non-exclusive, paid-up, irrevocable, world-wide license to publish or reproduce the published form of this article or allow others to do so, for United States Government purposes.

Funding

This work was funded by Office of Technology Transitions.

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Authors and Affiliations

  1. Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, CA, 94566, USA

    A. A. Baker, A. A. Maich, S. K. McCall & H. B. Radousky

  2. TTEC Thermoelectric Technologies, Wickliffe Road, Berryville, VA, 22611, USA

    R. C. Thuss

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  1. A. A. Baker
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  2. R. C. Thuss
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  3. A. A. Maich
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  4. S. K. McCall
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  5. H. B. Radousky
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Correspondence to A. A. Baker.

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Baker, A.A., Thuss, R.C., Maich, A.A. et al. Binder-free cold spray deposition of NdFeB permanent magnets. MRS Communications 13, 561–566 (2023). https://doi.org/10.1557/s43579-023-00382-x

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  • DOI: https://doi.org/10.1557/s43579-023-00382-x

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