| 简介 |
The purpose of the present invention is to obtain a sintered magnet having a high coercivity and a large maximum energy product in spite of using a reduced amount of rare earth element. The sintered magnet of the present invention comprises ferrous alloy particles having a film containing a heavy rare earth element or yttrium fluoride and rare earth-iron-boron alloy particles; between the ferrous alloy particles and the rare earth-iron-boron alloy particles, there is a region wherein the heavy rare earth element or yttrium concentration is higher than in other portions; the ferrous alloy particles have a larger saturation magnetization than do the rare earth-iron-boron alloy particles; and the ratio of the average grain size of the ferrous alloy particles and the average grain size of the rare earth-iron-boron alloy particles is between 1 and 100. |
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