R-T-B-BASED RARE EARTH SINTERED MAGNET

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PROBLEM TO BE SOLVED : To provide a high magnetic characteristics, high corrosion resistance Nd-Fe-B-based rare earth sintered magnet by adding Ni, Si and Cu in combination. SOLUTION : A R-T-B-based rare earth sintered magnet consists of a sintered body having a composition containing R(R is one kind or a combination of two or more kinds of rare earth elements including Y and Sc), T(T is Fe, or Fe and Co), B, Ni, Si, Cu, and M(M is one kind or a combination of two or more kinds selected from Ga, Zr, Nb, Hf, Ta, W, Mo, Al, V, Cr, Ti, Ag, Mn, Ge, Sn, Bi, Pb and Zn), where R is 26-36 mass%, B is 0.5-1.5 mass%, Ni is 0.1-2.0 mass%, Si is 0.1-3.0 mass%, Cu is 0.05-1.0 mass%, M is 0.05-4.0 mass%, and the remainder is T and inevitable impurities. COPYRIGHT : (C)2012, JPO&INPIT