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Recycling Used Nd-Fe-B Sintered Magnets via a Hydrogen-Based Route to Produce Anisotropic, Resin Bonded Magnets

Authors

  • Oliver Gutfleisch,

    Corresponding author
    1. Technical University of Darmstadt, Institute for Materials Science, Petersenstr. 23, 64287 Darmstadt, Germany, Fraunhofer Project Group Materials Recycling and Resource Strategies IWKS in Alzenau und Hanau, Brentanostr. 2, 63755 Alzenau, Germany
    • Technical University of Darmstadt, Institute for Materials Science, Petersenstr. 23, 64287 Darmstadt, Germany, Fraunhofer Project Group Materials Recycling and Resource Strategies IWKS in Alzenau und Hanau, Brentanostr. 2, 63755 Alzenau, Germany
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  • Konrad Güth,

    Corresponding author
    1. IFW Dresden, Institute for Metallic Materials, PO Box 270116, 01171 Dresden, Germany
    • IFW Dresden, Institute for Metallic Materials, PO Box 270116, 01171 Dresden, Germany.
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  • Thomas George Woodcock,

    1. IFW Dresden, Institute for Metallic Materials, PO Box 270116, 01171 Dresden, Germany
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  • Ludwig Schultz

    1. IFW Dresden, Institute for Metallic Materials, PO Box 270116, 01171 Dresden, Germany
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Abstract

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Hydrogen processing (HD + HDDR) is used to recycle Nd-Fe-B sintered magnets yielding anisotropic resin bonded magnets (RBM). HD produces single-crystalline powders from the sintered magnets. HDDR improves the magnetic properties by producing ultrafine grained, highly textured polycrystals. RBM produced from optimally processed recycled material shows comparable magnetic properties to non-recycled RBM.

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