METHOD FOR THE PRODUCTION OF PERMANENT MAGNETS AND A PERMANENT MAGNET

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Magnetic characteristic of such as coercivity is effectively promote or otherwise reducing and, yet, having corrosion resistance or weather resistance even when only a high permanent magnets having a glare-can be produced at low cost provides manufacturing method of permanent magnets. Closed and a lower part is opened and iron-boron-rare-earth sintered magnet, Dy, Tb the upper portion of the frame including metal vaporizing material is disposed the material by heating and evaporating, to evaporate the metal evaporation material the fabric, thereby forming the sintered magnet while the closed and a lower part is opened are arranged, with which comprises introducing an inert gas, said inert gas to control the partial pressure of the of the evaporated metal atoms to the supply to the surface of the sintered magnet and fabricated by sticking the metal atoms, characterized in that above, a wall member of the large runner prior to the formation of the holes : a method for manufacturing a metal reactor metal atoms in the crystal grain boundary phase to and/or productivity is sintered magnet to diffusion. Furthermore, sintered magnet into a process chamber is disposed the treating chamber introducing a cooling gas into the heating furnace during the cooling of a treatment chamber to by introducing reaction gas, the surface of the sintered magnet and which is covered with a passivating the reacting film.