Abstract The influence of Ce-Co alloy addition and sintering holding time on permanent magnetic properties and microstructure of nanocrystalline Nd-Fe-B bulk alloy have been investigated. The coercivity of Nd-Fe-B bulk can be enhanced greatly by more than 100% after adding Ce-Co powders. However, when the concentration of Ce-Co is up to 30 wt%, the density of the magnet can reach the maximum value of 7.58 g/cm3, but the coercivity does not increase significantly. On the other hand, with the increase of holding time to 10 min, the density and coercivity of magnets increase gradually, reaching up to 7.55 g/cm3 and 1134.3 kA/m, respectively. After the addition of Ce-Co alloy, Ce-Co may easily diffuse into the Nd-Fe-B matrix during hot-pressing and under the high pressure and temperature, thus increasing the content of grain boundary phase and the pinning effect of grain boundary, which leads to the increase of coercivity. The extension of the hot-pressing holding time may be more conducive to the diffusion of Ce-Co into the Nd-Fe-B matrix. In addition, the effect of Ce-Co addition on the magnetic properties of Nd-Fe-B with different content of rare-earth was also studied. The addition of Ce-Co can effectively increase the coercivity of nanocomposite Nd2Fe14B/α-Fe magnets. The addition of Nb to the parent alloy can further improve the coercivity. For Nd11Fe81.5Nb1Ga0.5B6 alloy with 10 wt% Ce-Co addition, the coercivity can increase from 740.28 kA/m to 1098.48 kA/m.

中文翻译：

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添加 Ce-Co 的纳米晶 Nd-Fe-B 的磁性和微观结构

摘要 研究了Ce-Co合金的添加量和烧结保温时间对纳米晶Nd-Fe-B块合金永磁性能和显微组织的影响。添加Ce-Co粉后，Nd-Fe-B块体的矫顽力可大大提高100%以上。然而，当Ce-Co的浓度达到30 wt%时，磁体的密度可以达到最大值7.58 g/cm3，但矫顽力没有明显增加。另一方面，随着保温时间增加到 10 分钟，磁体的密度和矫顽力逐渐增加，分别达到 7.55 g/cm3 和 1134.3 kA/m。添加Ce-Co合金后，Ce-Co在热压和高温高压下很容易扩散到Nd-Fe-B基体中，从而增加晶界相的含量和晶界的钉扎效应，导致矫顽力增加。延长热压保温时间可能更有利于Ce-Co扩散到Nd-Fe-B基体中。此外，还研究了Ce-Co的添加对不同稀土含量的Nd-Fe-B磁性能的影响。Ce-Co的加入可以有效提高纳米复合Nd2Fe14B/α-Fe磁体的矫顽力。在母合金中加入 Nb 可以进一步提高矫顽力。对于 Nd11Fe81.5Nb1Ga0.5B6 合金添加 10 wt% Ce-Co，矫顽力可以从 740.28 kA/m 增加到 1098.48 kA/m。延长热压保温时间可能更有利于Ce-Co扩散到Nd-Fe-B基体中。此外，还研究了Ce-Co添加对不同稀土含量的Nd-Fe-B磁性能的影响。Ce-Co的加入可以有效提高纳米复合Nd2Fe14B/α-Fe磁体的矫顽力。在母合金中加入 Nb 可以进一步提高矫顽力。对于 Nd11Fe81.5Nb1Ga0.5B6 合金添加 10 wt% Ce-Co，矫顽力可以从 740.28 kA/m 增加到 1098.48 kA/m。延长热压保温时间可能更有利于Ce-Co扩散到Nd-Fe-B基体中。此外，还研究了Ce-Co添加对不同稀土含量的Nd-Fe-B磁性能的影响。Ce-Co的加入可以有效提高纳米复合Nd2Fe14B/α-Fe磁体的矫顽力。在母合金中加入 Nb 可以进一步提高矫顽力。对于 Nd11Fe81.5Nb1Ga0.5B6 合金添加 10 wt% Ce-Co，矫顽力可以从 740.28 kA/m 增加到 1098.48 kA/m。在母合金中加入 Nb 可以进一步提高矫顽力。对于 Nd11Fe81.5Nb1Ga0.5B6 合金添加 10 wt% Ce-Co，矫顽力可以从 740.28 kA/m 增加到 1098.48 kA/m。在母合金中加入 Nb 可以进一步提高矫顽力。对于 Nd11Fe81.5Nb1Ga0.5B6 合金添加 10 wt% Ce-Co，矫顽力可以从 740.28 kA/m 增加到 1098.48 kA/m。