| 摘要 |
PROBLEM TO BE SOLVED: To provide an anisotropic rare earth sintered magnet which is new, high in performance, and substantially free of R-rich phase, by a method in which the magnet is reduced in rare earth element content and increased, while being reduced in transition metal content. SOLUTION: The composition of the isotropic rare earth sintered magnet is represented by 5 to 35 mass % rare earth element R, 0.3 to 5.0 mass % boron B, 0.01 to 5.0 mass % carbon C, 0.01 to 7.0 mass % additive metal element M (one or more elements selected from among Ti, Zr, and Hf), 0.001 to 50 mass% Co, and the remaing mass % Fe and impurities unavoidable in view of manufacturing, and its structure has an R2Fe14B phase as a primary phase and M-rich phase and an R oxide phase as the residual phases. |
