• DocumentCode
    43417
  • Title

    Enhanced Thermal Stability of Nd–Fe–B Sintered Magnets by Intergranular Doping Y72Co28 Alloys

  • Author

    Guangfei Ding ; Shuai Guo ; Lingwen Cai ; Ling Chen ; Changjiang Yan ; Don Lee ; Aru Yan

  • Author_Institution
    Key Lab. of Magn. Mater. & Devices, Ningbo Inst. of Mater. Technol. & Eng., Ningbo, China
  • Volume
    51
  • Issue
    8
  • fYear
    2015
  • fDate
    Aug. 2015
  • Firstpage
    1
  • Lastpage
    4
  • Abstract
    The intergranular addition process using Y72Co28 eutectic alloy powders has been applied to (Pr, Nd)27Dy4Fe67.65Cu0.15Al0.2B1(wt.%) sintered magnets, resulting in an enhanced thermal stability. It was found that the coercivity of magnets at 100 °C increased while the addition of Y72Co28 is 1 wt.%, whereas the magnetic properties decreased slightly at room temperature due to lower magnetocrystalline anisotropy field (HA ) of Y2Fe14B. The temperature coefficient of remanence (α ) and coercivity (β) for the magnets improved significantly. Microstructure observation indicated that Y atoms prefer to enter into the 2-14-1 phase and form a core-shell structure with an outer layer of (Nd, Dy, Y)2(Fe, Co)14B. Magnetic domain and intrinsic properties analysis suggested that the improved thermal stability resulted from the modified grain boundaries and the introduction of Y in matrix phases.
  • Keywords
    aluminium alloys; boron alloys; cobalt alloys; coercive force; copper alloys; doping; dysprosium alloys; eutectic alloys; grain boundaries; iron alloys; magnetic anisotropy; magnetic domains; magnetic particles; neodymium alloys; permanent magnets; powder metallurgy; praseodymium alloys; remanence; sintering; thermal stability; yttrium alloys; (PrNd)27Dy4Fe67.65Cu0.15Al0.2B-Y72Co28; coercivity; core-shell structure; enhanced thermal stability; eutectic alloy; eutectic alloy powders; intergranular addition process; intergranular doping alloys; intrinsic properties; magnetic domain; magnetic properties; magnetocrystalline anisotropy field; microstructure observation; modified grain boundaries; remanence; sintered magnets; temperature coefficient; Coercive force; Magnetic domains; Magnetic resonance imaging; Perpendicular magnetic anisotropy; Saturation magnetization; Thermal stability; Intergranular addition; intergranular addition; magnetic properties; microstructure; thermal stability;
  • fLanguage
    English
  • Journal_Title
    Magnetics, IEEE Transactions on
  • Publisher
    ieee
  • ISSN
    0018-9464
  • Type

    jour

  • DOI
    10.1109/TMAG.2015.2423652
  • Filename
    7094298
    • Link To Document
    https://search.isc.ac/dl/search/defaultta.aspx?DTC=49&DC=43417