Patent ID: 9275778
Filing Date: 2016-03-01
CPC Classification: H01F

Claim Text:
1. A method for manufacturing a permanent magnet, said method comprising: a step of wet-mixing a Dy compound precursor or a Tb compound precursor with a magnet raw material in the form of a powder in a solvent; a step of adding a resin binder to the magnet raw material coated with the Dy compound precursor or the Tb compound precursor; a step of producing a slurry by kneading the magnet raw material and the resin binder; a step of molding the slurry into a sheet form to prepare a green sheet; and a step of sintering the green sheet, wherein the permanent magnet is a Nd—Fe—B-based permanent magnet comprising 27 to 30 weight % of Nd, 60 to 70 wt % of Fe, and 1 to 2 weight % of B, and the Dy compound or the Tb compound is formed at the grain boundaries, wherein the Dy compound precursor or Tb compound precursor is soluble in the solvent, and wherein the Dy compound precursor or Tb compound precursor is an organic acid salt, an organic complex, or an organic metal compound.