Hydrogen decrepitation of a 2/17 sintered magnet at room temperature

Miha Zakotnik, Andrew Williams, G Martinek, Ivor Harris

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11 Citations (Scopus)


This paper reports the room temperature hydrogen decrepitation (HD) of fully dense, 2/17-type sintered magnets based on the composition, Sm(Co0.69Fe0.21Cu0.068Zr0.019)(7.49). These magnets absorb significant amounts of hydrogen over an extended period (similar to 48 h) at room temperature and at a pressure of 10 bar to give a final hydrogen uptake of 0.23 wt%. The consequence of this is the formation of a flake-like powder formed as a result of an "onion-skin" decrepitation process in these magnets. Magnetic measurements indicate that both the remanence, (Br) and the coercivity (Hcj) decrease as a result of the dissolved hydrogen and the magnetic properties are fully restored by vacuum degassing between 150 and 300 degrees C. Heating to higher temperatures result in a permanent reduction in the magnetic properties which is ascribed to changes from the optimum microstructure. It is proposed that the HD-process could be employed in the recycling of these magnets. (c) 2006 Elsevier B.V. All rights reserved.
Original languageEnglish
Pages (from-to)L1-L3
JournalJournal of Alloys and Compounds
Issue number1-2
Publication statusPublished - 1 Jan 2008


  • 2/17
  • recycling
  • hydrogen decrepitation (HD)
  • permanent magnets
  • scrap magnets


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