Hydrogen Decrepitation Press-Less Process Recycling of NdFeB sintered magnets

Manlong Xia, Asger Bech Abrahamsen, Christian Bahl, Badrinath Veluri, Allan I. Søegaard, Poul Bøjsøe

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A Hydrogen Decrepitation Press-Less Process (HD-PLP) recycling method for recycling of anisotropic NdFeB magnets is demonstrated. The method combines hydrogen decrepitation (HD) disintegration of the initial magnet, powder sieving and the Press-Less Process (PLP), where hydride powder is sintered in a graphite mold. Coercivities up to 534 kA/m were obtained in porous samples based on powder size d < 100 μm. Adding a ball milling step resulted in full density isotropic magnets for d > 100 μm. The coercivity reached Hci = 957 kA/m being 86 % of the original N48M material without addition of rare earth elements.
Original languageEnglish
JournalJournal of Magnetism and Magnetic Materials
Pages (from-to)55-61
Publication statusPublished - 2017


  • Recycling
  • NdFeB sintered magnet
  • Press-Less Process


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