FIELD: physics.
SUBSTANCE: method involves heating an iron-boron-rare-earth element based sintered magnet to a given temperature in a working chamber, evaporating Dy and/or Tb fluoride lying in the same or different working chamber, allowing the evaporated material to attach to the surface of the sintered magnet through diffusion of atoms of the evaporated material into the grain-boundary phase of the sintered magnet.
EFFECT: high efficiency at low cost and improved magnetic properties of permanent magnets.
14 cl, 11 dwg, 4 ex
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