Effect of DyF3 additions on the coercivity and grain boundary structure in sintered Nd–Fe–B magnets

Simultaneous application of Dy–X (X= F or H) powder doping and dip-coating processes to Nd–Fe–B sintered magnets

“…The development of a core-shell microstructure, formed by targeting Dy to the grain boundary region of the Nd 2 Fe 14 B phase, is one efficient method for reducing the Dy content in sintered Nd-Fe-B magnets [2][3][4][5][6][7][8][9][10][11][12]. The core-shell microstructure can be obtained by a Dy-X (X = F, H, O, S, or N) powder doping process, or by the grain boundary diffusion process (GBDP) using Dy-X dip-coating [2][3][4][5][6][7][8][9][10][11][12]. DyF 3 and DyH 2 compounds are frequently used for powder doping or dip-coating processes [5][6][7][8][9][10][11][12].…”

“…The core-shell microstructure can be obtained by a Dy-X (X = F, H, O, S, or N) powder doping process, or by the grain boundary diffusion process (GBDP) using Dy-X dip-coating [2][3][4][5][6][7][8][9][10][11][12]. DyF 3 and DyH 2 compounds are frequently used for powder doping or dip-coating processes [5][6][7][8][9][10][11][12]. DyF 3 and DyH 2 added via the powder doping and the dip-coating processes both show distinctive influences on the microstructural and magnetic properties of the sintered magnets because of the different diffusional behavior of Dy between the two compounds [9][10][11][12].…”

Effect of DyF3 and TbF3 additions on the coercivity enhancement in grain boundary diffusion processed Nd-Fe-B permanent magnets

“…Grain boundary diffusion process (GBDP) has been proved to be a promising way to enhance the coercivity without sacrificing the remanence of Nd-Fe-B magnets [4,6,7,9]. In these processes, heavy rare earth (HRE) elements powders in different forms of oxides, fluorides, sulfides or pure metals are used for coating the magnets followed by the heat treatment.…”

“…By contrast, the grain boundary phases become continuous and thicker with increasing the diffusion temperature. The continuous grain boundary phases may contribute to increase the coercivity [9].…”

Recovery of Yttrium and Dysprosium from the Rare Earth Concentrate, Southwestern Sinai, Egypt

“…Dysprosium's main use is in alloys for neodymium-based magnets. This is because it is resistant to demagnetization at high temperatures [1][2][3][4][5]. Yttrium is used in the manufacturing of ceramics, in fluorescent lighting phosphors, computer displays and automotive fuel consumption sensors because of the highest thermodynamic affinity of yttrium for oxygen of any element.…”