Method for manufacturing sintered rare earth magnet

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PROBLEM TO BE SOLVED : To provide a method for manufacturing a sintered Sm2Co17magnet, with which a sintered rare earth magnet can be obtained, which will not cause hydrogen embrittlement even in a hydrogen atmosphere, and which can be used for a motor. SOLUTION : A method for manufacturing a sintered rare earth magnet, in which an alloy, comprising 20 to 30 wt.% R (R is Sm or two or more kinds of rare earth elements, containing 50 wt.% or more Sm), 10 to 45 wt.% Fe, 1 to 10 wt.% Cu, and 0.5 to 5 wt.% Zr with the remaining being Co and inevitable impurities, is one in which the alloy is dissolved, cast, pulverized, finely pulverized, molded in a magnetic field, sintered and aged sequentially into a sintered magnet; after the surface of the sintered magnet is machined by cutting and/or grinding, it is subjected to metal plating and then thermal treatment at 80 to 850°C for 10 minutes to 50 hours. COPYRIGHT : (C)2003, JPO