R-FE-B SINTERED MAGNET WITH ENHANCED MECHANICAL PROPERTIES AND METHOD FOR PRODUCING THE SAME

摘要

Disclosed are an R-Fe-B sintered magnet and a method for producing the same. More specifically, provided is an R-Fe-B (R=Nd, Dy, Pr, Tb, Ho, La, Ce, Sm, Gd, Er, Tm, Yb, Lu or Th) sintered magnet having a structure in which R2Fe14B crystal grains as major phases are surrounded with R-rich phases, wherein a dihedral angle between two adjacent R2Fe14B crystal grains and the R-rich phase contacting the R2Fe14B crystal grains is 70° or less in a triple junction formed by the R2Fe14B crystal grains. The sintered magnet maintains a high coercive force and exhibits improved mechanical propertiesand is thus applicable to motors or permanent magnets used at high temperatures.