METHOD FOR MANUFACTURING RARE EARTH-IRON-BORON BASED MAGNET

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PROBLEM TO BE SOLVED : To provide a RFeB based magnet which is high in magnetization properties. SOLUTION : A method for manufacturing a RFeB based magnet including, as a rare earth element R, a light rare earth element RL consisting of at least one element of a group consisting of Nd and Pr comprises : a before-magnetization base material-preparation step in which a before-magnetization base material of the RFeB based magnet is prepared from powder of a raw material alloy of the RFeB based magnet having an average grain diameter of smaller than 5 μm; a grain boundary diffusion treatment step in which the before-magnetization base material is heated to a given temperature with a deposit left adhering to the surface of the before-magnetization base material, provided that the deposit includes a heavy rare earth element RH consisting of at least one element of a group consisting of Tb, Dy and Ho; a precise processing step in which a precisely processed body is prepared by shaping, by means of machining, the before-magnetization base material into a finished product form; and a post-precise-processing heating step in which the precisely processed body is heated to a temperature of 200-900°C. COPYRIGHT : (C)2015, JPO&INPIT