METHOD OF MANUFACTURING R-T-B BASED RARE EARTH PERMANENT MAGNET

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PROBLEM TO BE SOLVED : To optimize addition modes of M element and Tb which suppress grain growth in sintering process when manufacturing R-T-B based rare earth permanent magnet of which oxygen content is reduced by a mixing method. SOLUTION : The R-T-B based rare earth permanent magnet consists of a sintered body of which R2T14B1 compound (R always contains Tb, R includes Y, T requires Fe or Fe and Co) is magnetic phase, with M element (M is one or more kinds of Zr, Nb, and Hf) contained in it. The manufacturing method includes a process for producing a molding containing particles consisting of main phase forming alloy containing R2T14B1 compound and the particles consisting of grain boundary phase forming alloy whose main component is R and T, and a process for sintering the molding. Tb and M elements are supplied in a mode other than such mode as supplied from the main phase forming alloy containing Tb and M elements. COPYRIGHT : (C)2006, JPO&NCIPI