| 简介 |
The purpose of the present invention is to improve the magnetic characteristics of a sintered magnet without adding a supplementary heavy rare earth element. A sintered magnet composed of an NdFeB main phase and a grain boundary phase, wherein : the grain boundary phase contains an oxyfluoride; the concentration of fluorine in the oxyfluoride decreases depthwise from the surface of the sintered magnet toward the center thereof; and the heavy rare earth element concentration of the oxyfluoride at the surface of the sintered magnet is nearly equal to that at the center thereof |
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