Sintered rare earth magnet

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PROBLEM TO BE SOLVED : To obtain an R2Fe14B-based sintered rare-earth magnet that does not cause hydrogen embrittlement even in a hydrogen atmosphere and can be used for motors, etc. SOLUTION : This R2Fe14B-based sintered rare-earth magnet is composed of R (one, two, or more kinds of rare-earth elements selected from among Nd, Pr, Dy, Tb, and Ho) of 20-35 wt.%, Co of ≤15 wt.%, B of 0.2-8 wt.%, an additive composed of at least one kind of element selected from among Ni, Nb, Al, Ti, Zr, Cr, V, Mn, Mo, Si, Sn, Ga, Cu, and Zn of ≤8 wt.%, and the balance Fe with inevitable impurities. On the surface of the magnet, a metal oxide layer and/or a metal nitride layer is formed directly or through (n) plated metallic layers (wherein, n is an integer, ≥1). COPYRIGHT : (C)2003, JPO