Verfahren zur Herstellung eines Permanentmagneten und Permanentmagnet

摘要

High-performance magnets are obtained by: housing metal evaporating materials (v) containing at least one of Dy and Tb and sintered magnets (S) inside a processing box; disposing the processing box inside a vacuum chamber; thereafter, heating the processing box to a predetermined temperature in a vacuum atmosphere to thereby evaporate the metal evaporating materials and cause them to be adhered to the sintered magnets. The metal atoms of the adhered Dy or Tb are diffused into grain boundaries and/or grain boundary phases of the sintered magnets. A method of manufacturing a permanent magnet is provided in which, even if the sintered magnets and the metal evaporating materials are disposed in close proximity to each other, the squareness of demagnetization curve is not impaired and in which high feasibility of mass production can be attained. While the metal evaporating materials are being evaporated, an inert gas is introduced into the processing chamber in which the sintered magnets are disposed.