METHOD OF PREVENTING HYDROGEN EMBRITTLEMENT OF SINTERED RARE EARTH MAGNET

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PROBLEM TO BE SOLVED : To provide a Sm2Co17-based sintered magnet capable of solving a problem that hydrogen embrittlement occurs in a hydrogen atmosphere and thereby chipping, cracking, or powdering occur. SOLUTION : There is provided a method of preventing hydrogen embrittlement of a sintered rare earth magnet, wherein in a sintered rare earth magnet composed of R (wherein R is Sm or two or more kinds of rare-earth elements containing Sm of 50 wt.% or more) of 20-30 wt.%, Fe of 10 to 45 wt.%, Cu of 1 to 10 wt.%, Zr of 0.5 to 5 wt.%, a balance Co, with inevitable impurities, on the surface of this magnet, a metal oxide layer and/or a metal nitride layer is formed directly or through plated metallic layers. By a Sm2Co17-based sintered magnet of the present invention, it is possible to obtain a sintered rare earth magnet that does not cause hydrogen embrittlement even in a hydrogen atmosphere and can be used for motors, etc. COPYRIGHT : (C)2007, JPO&INPIT