METHOD OF MANUFACTURING ANISOTROPIC HOT-DEFORMED MAGNET USING HOT-DEFORMATION PROCESS AND HOT-DEFORMED MAGNET MANUFACTURED THEREBY

摘要

The method for fabricating an R—Fe—B hot-deformed magnet according to the present invention includes: preparing an R—Fe—B magnetic powder; mixing the magnetic powder with a high-melting point metal or a metal compound including the high-melting point metal; press sintering the mixture; and hot-deforming the sintered body by applying heat and pressure, and thus may suppress the growth of crystal grains, and does not need a sintering process of 1,000° C. or more, and the magnetization direction of crystal grains is arranged in one direction even without applying the magnetic field by the hot deformation, and thus, a hot-deformed magnet may be more economically produced. Further, the R—Fe—B hot deformed magnet of the present invention includes a structure in which anisotropic plate-shaped crystal grains of uniform size having an average diameter of 400 to 900 nm are evenly distributed throughout the magnet, and has a uniform and minute size of crystal grains in the magnet, and thus, may secure excellent coercive force, and plate-shaped crystal grains formed by the hot deformation may have excellent residual magnetic flux density because the magnetization direction is arranged in one direction.