• DocumentCode
    765796
  • Title

    Coercivity Enhancement by the Grain Boundary Diffusion Process to Nd–Fe–B Sintered Magnets

  • Author

    Hirota, K. ; Nakamura, H. ; Minowa, T. ; Honshima, M.

  • Author_Institution
    Magnetic Mater. Res. Center, Fukui
  • Volume
    42
  • Issue
    10
  • fYear
    2006
  • Firstpage
    2909
  • Lastpage
    2911
  • Abstract
    Changes in magnetic properties after applying grain boundary diffusion process to Nd-Fe-B sintered magnets with a thickness of several millimeters were investigated, and their microstructures were also observed. Coercivities of the magnets coated with heavy rare earths (HRE=Dy and Tb) oxide or fluoride powder and then heat-treated, were enhanced significantly without a considerable reduction in a remanence. During the heat treatment, HRE element diffused into the magnet through the grain boundary, and formed HRE-rich shells around the grain boundary of the Nd2Fe14B phase by substituting Nd. The coercivity increased by more than 400 kA/m with a thickness of up to 3 mm for the magnet processed with TbF3
  • Keywords
    coercive force; grain boundary diffusion; heat treatment; iron compounds; magnets; neodymium alloys; sintering; Nd2Fe14B; TbF3; coercivity enhancement; grain boundary diffusion process; heat-treatment; sintered magnets; Coercive force; Diffusion processes; Grain boundaries; Heat treatment; Magnetic properties; Magnets; Microstructure; Neodymium; Powders; Remanence; Coercive force; Dy; DyF; TbF; diffusion; grain boundary; powder;
  • fLanguage
    English
  • Journal_Title
    Magnetics, IEEE Transactions on
  • Publisher
    ieee
  • ISSN
    0018-9464
  • Type

    jour

  • DOI
    10.1109/TMAG.2006.879906
  • Filename
    1704479
    • Link To Document
    https://search.isc.ac/dl/search/defaultta.aspx?DTC=49&DC=765796