Improving NdFeB magnet fabrication: In situ observation of powder flow
Improving NdFeB magnet fabrication: In situ observation of powder flow
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改进 NdFeB 磁体制造：粉末流动的原位观察
DOI：
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发表时间：
2004
影响因子：
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通讯作者：
S. Shima
中科院分区：
文献类型：
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作者：
H. Kotera;F. Tsumori;Ikkou Iritani;Tomoharu Watanabe;S. Shima
NdFeB粉末是磁各向异性的，并且可以通过在施加的磁场中压制来提供高性能磁体。在这项研究中，我们观察的行为的磁性粉末在压实后施加磁场，获得指导方针的目的是改进设计的磁铁制造工艺。我们做了一个透明的模具，用钕铁硼粉末填充它，并将组件定位在线圈的中心。线圈被分成两半，以便可视化粉末响应。施加脉冲磁场并移动冲头以压实粉末。通过模板匹配和相关弛豫标记分析粉末的运动。这与没有施加磁场的情况下获得的响应进行比较。粉末的运动由于在磁场存在下形成的柱结构而改变。
NdFeB powder is magnetically anisotropic and can provide high performance magnets via compaction in an applied magnetic field. In this study we observe the behavior of the magnetic powder during compaction after applying a magnetic field, with the objective of obtaining guidelines for improved design of the magnet fabrication process. We make a transparent die, fill it with NdFeB powder and locate the assembly at the center of a coil. The coil is separated into two halves, in order to visualize the powder response. A pulsed magnetic field is applied and the punch displaced to compact the powder. Movement of the powder is analyzed by template-matching with correlation-relaxation-labeling. This is compared to the response obtained without application of a magnetic field. The movement of the powder changes due to column structures formed in the presence of the magnetic field.