MANUFACTURE ND-FE-B MAGNETS USING HOT PRESSES WITH REDUCED DYSPROSIUM OR TERBIUM

摘要

A method of producing a magnetic material for a permanent magnet using hot pressing or die upsetting or both by combining two powders and optimizing grain boundary diffusion of Dy or Tb. The method may include magnetic material for a permanent magnet using hot pressing using a core powder containing Nd, Fe and B, and a surface powder containing Dy or Tb in metallic alloy form, combining the materials, forming a solid material in a shaped form under a magnetic field in a vacuum, heating the solid material, forming it in a die hot-press to form a magnetic material, heat it if necessary, and then cool it.