Rare earth magnet and rare earth magnet alloy powder having high corrosion resistance.

摘要

An (Fe,Co)-B-R tetragonal type magnet and magnet alloy powder having a high corrosion resistance, which have a boundary phase stabilized by Co and Al against corrosion, and which consist essentially of: 0.2 - 3.0 at% Dy and 12 - 17 at% of the sum of Nd and Dy; 5 - 10 at% B; 0.5 - 13 at% Co; 0.5 - 4 at% Al; and the balance being at least 65 at% Fe. 0.1 - 1.0 at% of Ti and/or Nb may be present. The alloy powders can be stabilized.