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首页> 外文期刊>Journal of magnetism and magnetic materials >Coercivity enhancement and grain refinement in Nd-Fe-B sintered magnets with pyrite doping by jet milling
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Coercivity enhancement and grain refinement in Nd-Fe-B sintered magnets with pyrite doping by jet milling

机译：喷射铣削黄铁矿掺杂钕铁硼烧结磁体的矫顽力和晶粒细化

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摘要

In this paper, the methods to solve the uniformity problem of sulfur (S) element were studied in pyrite-doped Nd-Fe-B sintered magnets. With pyrite addition, the coercivity was enhanced, except for the magnets with pyrite doped by arc melting. Sulphur loss existed during the arc melting process. When pyrite doped by ball milling, the coercivity increased from 1236.3 kA/m to 1327.0 kA/m. The average grain size decreased from 9.10 mu m to 7.9 mu m. As a drawback, obvious sulfur clusters were formed. Jet milling was an effective way to achieve uniform distribution of S element. In the magnets with pyrite doped by jet milling, clear and continuous grain boundary phases were formed with smaller grain size. Correspondingly, the average grain size further decreased to 6.7 mu m. A coercivity enhancement of 13.4% (1401.8 kA/m) was obtained with slightly decreasing in remanence and maximum magnetic energy product.
机译：本文研究了硫铁矿掺杂钕铁硼烧结磁体中硫元素均匀性的解决方法。通过添加黄铁矿，除了通过电弧熔化掺杂了黄铁矿的磁体以外，矫顽力得到了提高。电弧熔化过程中存在硫损失。当通过球磨掺杂黄铁矿时，矫顽力从1236.3 kA / m增加到1327.0 kA / m。平均晶粒尺寸从9.10微米降低到7.9微米。作为缺点，形成了明显的硫簇。喷射研磨是实现S元素均匀分布的有效方法。在通过喷射铣削掺杂的具有黄铁矿的磁体中，形成了具有较小晶粒尺寸的透明且连续的晶界相。相应地，平均晶粒尺寸进一步减小至6.7μm。矫顽力提高了13.4％（1401.8 kA / m），剩磁和最大磁能积略有降低。

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