Method for manufacturing sintered rare earth magnet

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PROBLEM TO BE SOLVED : To provide a rare earth sintered magnet used for a motor, etc., that does not cause hydrogen brittleness even in a hydrogen atmosphere, by a method for manufacturing an R2Fe14B sintered magnet. SOLUTION : R (R is at least one kinds of rare earth elements selected out of Nd, Pr, Dy, Tb and Ho) of 20-35 wt.%, Co of 15 wt.% or less, B of 0.2-8 wt.%, at least one kinds of element, selected out of Ni, Nb, Al, Ti, Zr, Cr, V, Mn, Mo, Si, Sn, Ga, Cu and Zn, of 8 wt.% or less as an additive, and Fe and unavoidable impurities in residual part constitute an alloy. The alloy is fused and cast, and then crushed, finely pulverized, molded in a magnetic field, sintered and heat-treated in this order to make the sintered magnet. Further the sintered magnet is cut and/or ground to work a surface thereof, and then metal-plated. Then it is heat-treated at 80-700°C for 10 minutes to 50 hours. COPYRIGHT : (C)2003, JPO