Importance

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Abstract

A sintered rare-earth magnet contains specific amounts of R (two or more rare-earth elements, with Nd and Pr being essential), boron (B), M1 (one or more element selected from Al, Si, Cr, Mn, Cu, Zn, Ga, Ge, Mo, Sn, W, Pb and Bi) and M2 (one or more element selected from Ti, V, Zr, Nb, Hf and Ta), with the balance being T (one or more element selected from Fe and Co). The magnet has a R₂Ti₄B main phase and, over an area fraction of more than 0% and up to 10%, an R₂(T, M1)₁₇ phase covered with an R₆(T, M1)₁₄ phase and an R-rich phase. Two magnetization inflection points—a first knickpoint on a low magnetic field side and a second knickpoint on a high magnetic field side—are present in the second quadrant of the magnetic polarization curve at 23° C.

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First Claim