| 简介 |
A rare-earth permanent magnet that includes Fe, B, and one or more elements selected from the rare-earth elements including Y, the structure of the rare-earth magnet, aside from unavoidable impurities, being expressed by the formula (R1-xAEx)y(Fe1-aMa)100-y-zBz (where R is one or more elements selected from among the rare-earth elements including Y, and includes 70 at% or more of one or more elements selected from the group consisting of Y, La, Ce, Pr, Nd, Pm, Sm, and Eu, 50 at% or more of R being Ce; AE is one or more elements selected from the group consisting of Ca, Sr, and Ba; M is one or more elements selected from the group consisting of Cu, Ni, Ti, Mo, Zr, Hf, Ga, Al, and Si; x, y, and z are each positive numbers satisfying the conditions 0 < x ≤ 0.4, 10 ≤ y ≤ 20, and 4 ≤ z ≤ 12; and a is 0 or a positive number satisfying the condition 0 < a ≤ 0.1), whereby a rare-earth permanent magnet is provided in which the heavy rare-earth element content is reduced as much as possible, the rare-earth permanent magnet is sufficient for practical use, and coercivity Hc and saturation magnetization Ms are balanced with high-temperature characteristics. |
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