Abstract The diffusion efficiency of DyF3 is significantly enhanced by using a novel stack procedure. In the stack procedure, the magnets place one on top of the other to ensure the contact surface does not expose outside directly. During the diffusion process, DyF3 firstly convertes to NdF3, then NdF3 reacts with trace oxygen in the cavity to form NdOF that makes more F atoms diffuse into magnet, which is detrimental to the enhancement of coercivity. But through the stack diffusion technology, the tight contact between the upper and bottom surface of magnets suppresses the oxidation of NdF3 as much as possible to prevent the formation of NdOF. Thus, less F diffusion into magnets, better Dy distribution and higher coercivity increment are obtained. After 10 h diffusion, the coercivity of magnet under stack diffusion increases from 15.45 kOe to 17.47 kOe with 0.28 wt% Dy consumption and the increment is almost twice that of magnet treated in traditional diffusion.

中文翻译：

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通过堆叠扩散技术提高烧结钕铁硼磁体中 DyF3 扩散效率

摘要 DyF3 的扩散效率通过使用新的堆叠程序显着提高。在堆叠过程中，磁铁将一个放在另一个上面，以确保接触面不会直接暴露在外面。在扩散过程中，DyF3首先转化为NdF3，然后NdF3与腔体中的微量氧反应形成NdOF，使更多的F原子扩散到磁体中，这不利于矫顽力的增强。但是通过叠层扩散技术，磁铁上下表面的紧密接触，尽可能抑制了NdF3的氧化，防止了NdOF的形成。因此，获得较少的 F 扩散到磁体中，获得更好的 Dy 分布和更高的矫顽力增量。扩散 10 h 后，磁体在堆叠扩散下的矫顽力从 15.45 kOe 增加到 17。