Magnetic and microstructural properties of DyF3-coated sintered Nd-Fe-B magnets by electrophoretic deposition

To meet the requirement of high coercivity of sintered Nd-Fe-B magnets in various applications of traction motors and wind power generators, substitution of Dy or Tb for Nd is essential [1, 2]. Through electrophoretic deposition (EPD), we first use the weight ratio of the DyF₃ coatings and the magnet to characterize accurately the effective content of Dy in the GBDP magnets. Here we systematically investigate the magnetic and microstructural property changes of the DyF₃-coated sintered Nd-Fe-B magnet as a function of the effective DyF₃ content and study the mechanism of coercivity enhancement.