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首页> 美国卫生研究院文献>Materials >Influence of Melt-Pool Stability in 3D Printing of NdFeB Magnets on Density and Magnetic Properties
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Influence of Melt-Pool Stability in 3D Printing of NdFeB Magnets on Density and Magnetic Properties

机译：NdFeB磁体3D打印中熔池稳定性对密度和磁性能的影响

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摘要

The current work presents the results of an investigation focused on the influence of process parameters on the melt-track stability and its consequence to the sample density printed out of NdFeB powder. Commercially available powder of Nd7.5Pr0.7Fe75.4Co2.5B8.8Zr2.6Ti2.5 alloy was investigated at the angle of application in selective laser melting of permanent magnets. Using single track printing the stability of the melt pool was investigated under changing process parameters. The influence of changing laser power, scanning speed, and powder layer thickness on density, porosity structure, microstructure, phase composition, and magnetic properties were investigated. The results showed that energy density coupled with powder layer thickness plays a crucial role in melt-track stability. It was possible to manufacture magnets of both high relative density and high magnetic properties. Magnetization tests showed a significant correlation between the shape of the demagnetization curve and the layer height. While small layer heights are beneficial for sufficient magnetic properties, the remaining main parameters tend to affect the magnetic properties less. A quasi-linear correlation between the layer height and the magnetic properties remanence (J ), coercivity (H ) and maximum energy product ((BH) ) was found.
机译：当前的工作提出了一项研究结果，该研究结果集中于工艺参数对熔体轨迹稳定性的影响及其对NdFeB粉末打印出的样品密度的影响。从永磁选择性激光熔化的应用角度研究了Nd7.5Pr0.7Fe75.4Co2.5B8.8Zr2.6Ti2.5合金的市售粉末。在改变工艺参数的情况下，使用单轨印刷研究了熔池的稳定性。研究了改变激光功率，扫描速度和粉末层厚度对密度，孔隙结构，微观结构，相组成和磁性能的影响。结果表明，能量密度与粉末层厚度有关，对熔体痕迹的稳定性起着至关重要的作用。可以制造具有高相对密度和高磁性能的磁体。磁化测试显示，退磁曲线的形状与层高之间存在显着的相关性。尽管较小的层高有利于获得足够的磁性能，但其余主要参数往往对磁性能的影响较小。发现层高与磁性能剩磁（J），矫顽力（H）和最大能量积（（BH））之间存在准线性关系。

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