| 摘要 |
<p>The objective of the present invention is to provide a method for making a NdFeB system sintered magnet, capable of enhancing the effect of increasing the coercive force and preventing the instability of the effects, and in addition, being inexpensive. The method for making a NdFeB system sintered magnet according to the present invention has processes of coating a NdFeB system sintered magnet with a powder containing Dy and/or Tb, then heating the NdFeB system sintered magnet, and thereby diffusing Rh in the powder into the NdFeB system sintered magnet through a grain boundary, and is characterized in that the powder contains 0.5 through 50 weight percent of Al in a metallic state; and the amount of oxygen contained in the NdFeB system sintered magnet is equal to or less than 0.4 weight percent.</p> |
