| 摘要 |
An R-T-B sintered magnet characterized in that the composition represented by formula (1) satisfies conditions (2) through (9). (1) uRwBxGazAlvCoqTigFejM (in which R represents neodymium and optionally one or more other rare earth elements; M represents elements other than boron, gallium, aluminum, cobalt, titanium, iron, and the element(s) represented by R; and u, w, x, z, v, q, g, and j represent mass percentages) (2) 29.0 ≤ u ≤ 32.0 (with heavy rare earth elements (RH) constituting no more than 10% of the mass of the R-T-B sintered magnet) (3) 0.93 ≤ w ≤ 1.00 (4) 0.3 ≤ x ≤ 0.8 (5) 0.05 ≤ z ≤ 0.5 (6) 0 ≤ v ≤ 3.0 (7) 0.15 ≤ q ≤ 0.28 (8) 60.42 ≤ g ≤ 69.57 (9) 0 ≤ j ≤ 2.0 Said R-T-B sintered magnet is also characterized in that, letting gʹ represent g divided by the atomic weight of iron, letting vʹ represent v divided by the atomic weight of cobalt, letting zʹ represent z divided by the atomic weight of aluminum, letting wʹ represent w divided by the atomic weight of boron, and letting qʹ represent q divided by the atomic weight of titanium, relations (A) and (B) are satisfied. (A) 0.06 ≤ (gʹ+vʹ+zʹ) - (14×(wʹ−2×qʹ)) (B) 0.10 ≥ (gʹ+vʹ+zʹ) - (14×(wʹ−qʹ)) |
