Rapid Sintering of Anisotropic, Nanograined Nd-Fe-B by Flash-Spark Plasma Sintering

E.G. Castle, Richard Sheridan, S Grasso, Allan Walton, MJ Reece

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A Spark Plasma Sintering (SPS) furnace was used to Flash-Sinter (FS) Nd-Fe-Dy-Co-B-Ga melt spun permanent magnetic material. During the 10 second “Flash” process (heating rate 2660 K min-1), sample sintering (to theoretical density) and deformation (54 % height reduction) occurred. This produced texturing and significant magnetic anisotropy, comparable to conventional die-upset magnets; yet with much greater coercivities (>1600 kA m-1) due to the nanoscale characteristics of the plate-like sintered grains. These preliminary results suggest that Flash-SPS could provide a new processing route for the mass production of highly anisotropic, nanocrystalline magnetic materials with high coercivity.
Original languageEnglish
Pages (from-to)279-283
JournalJournal of Magnetism and Magnetic Materials
Early online date25 May 2016
Publication statusPublished - 1 Nov 2016


  • Magnetic anisotropy
  • High-speed deformation
  • Spark plasma sintering
  • Hard magnetic materials
  • Flash sintering


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