| 摘要 |
The invention aims at providing a process for the production of NdFeB sintered magnets which can bring about higher coercive force improving effect and smaller scattering of the effect and which enables the production of the magnets at a low cost. A process for the production of NdFeB sintered magnets which comprises applying a powder containing Dy and/or Tb to an NdFeB sintered magnet and heating the resulting magnet to diffuse the Rcontained in the powder into the magnet through grain boundaries, characterized in that the powder contains 0.5 to 50wt% of metallic Al and the oxygen content of the NdFeB sintered magnet is 0.4wt% or below. |
