摘要
本文研究了不同硼(B)含量(0.91 wt%、0.94 wt%和0.97 wt%)烧结钕铈铁硼(Nd-Ce-Fe-B)磁体的磁性能、微观组织及硬度。烧结Nd-Ce-Fe-B磁体的矫顽力随着B含量从0.97 wt%降低到0.91 wt%,矫顽力从15.07 kOe增加到16.30 kOe,而剩磁几乎保持不变。金相分析发现B含量的变化不影响磁体的晶粒尺寸,但是晶界富稀土相的量随着B含量的降低而增加,B含量为0.91 wt%的磁体的晶界相分布连续性明显优于B含量为0.94 wt%和0.97 wt%的磁体。通过背散射电子图像进一步分析发现,降低B的含量可以有效提升晶界富稀土相的数量和分布均匀性。晶界相的增加使晶粒间的磁交换耦合作用减弱,提升了磁体的矫顽力。XRD分析表明降低B的含量可以提高磁体的取向度。显微硬度分析发现降低B含量还可以有效降低磁体的硬度,改善其切削加工性能。本文的研究成果可为制备低成本高性能Nd-Ce-Fe-B提供理论指导和技术支撑。
This study investigates the magnetic properties, microstructure, and hardness of sintered Nd-Ce-Fe-B magnets with different boron (B) contents (0.91 wt%, 0.94 wt%, and 0.97 wt%). The coercivity of the sintered Nd-Ce-Fe-B magnets increases from 15.07 kOe to 16.30 kOe as the B content decreases from 0.97 wt% to 0.91 wt%, while the remanence remains almost unchanged. Metallographic analysis reveals that the variation in B content does not affect the grain size of the magnets, but the amount of rare earth-rich phase at grain boundaries increases with decreasing B content. The distribution continuity of the grain boundary phase in the magnets with 0.91 wt% B content is significantly better than that in magnets with 0.94 wt% and 0.97 wt% B content. Further analysis using backscattered electron imaging indicates that reducing the B content effectively increases the quantity and uniformity of the rare earth-rich phase at grain boundaries. The increase in grain boundary phase weakens the magnetic exchange coupling between grains, enhancing the coercivity of the magnets. XRD analysis demonstrates that reducing the B content improves the orientation degree of the magnets. Microhardness analysis reveals that lowering the B content can effectively reduce the hardness of the magnets, thereby improving their machinability. The research findings of this study can provide theoretical guidance and technical support for the preparation of low-cost, high-performance Nd-Ce-Fe-B magnets.
出处
《材料科学》
2024年第6期898-904,共7页
Material Sciences
