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Laser Alloying Advantages by Dry Coating Metallic Powder Mixtures with SiOx Nanoparticles

机译:通过用SiOx纳米颗粒干涂金属粉末混合物实现激光合金化的优势

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摘要

Up to now, minimizing segregation of free-flowing, microscale metal powder mixtures driven by different mass density is an open challenge. In this work, effects of particle size variation on homogeneity of Al-Cu mixtures, with a density ratio of 3.3, are examined. Dry coating Al particles with 0.3 wt% fumed silica SiOx nanoparticles significantly decreases interparticle attraction. This enlarges the range of free-flowing Al particle sizes to < 20 µm. Powder mixture homogeneity is examined optically in vibrated bulk powder and thinly spread layers. From various powder mixtures, solid samples are built layer by layer with the Additive Manufacturing (3D printing) technology Laser Beam Melting in metal powder bed (LBM). Chemical homogeneity of solids is evaluated via energy-dispersive X-ray spectroscopy, backscattered electron microscopy, metallographic analysis and tensile tests. Persistent homogeneity of Al-Cu powder mixtures and LBM solids is found only with particles < 20 µm dry coated with SiOx nanoparticles. Observed segregation phenomena are explained with a decrease in particle mobility at increasing local concentration and the decreasing effectiveness of mass in smaller particles. The main effects are based on geometry, so they are expected to be transferrable to other nanoparticles, alloying components and powder bed technologies, e.g., binder jetting.
机译:迄今为止,最大程度地减少由不同质量密度驱动的自由流动的微型金属粉末混合物的分离是一个开放的挑战。在这项工作中,研究了粒径变化对密度比为3.3的Al-Cu混合物均质性的影响。用0.3 wt%的气相二氧化硅SiOx纳米颗粒对Al颗粒进行干法涂层可显着降低颗粒间的吸引力。这将自由流动的Al粒径范围扩大到<20 µm。用光学方法检查振动的散装粉末和薄层中粉末混合物的均匀性。从各种粉末混合物中,通过增材制造(3D打印)技术在金属粉末床(LBM)中进行激光束熔化,逐层构建固体样品。固体的化学均质性通过能量色散X射线光谱,反向散射电子显微镜,金相分析和拉伸试验进行评估。只有用SiOx纳米颗粒干涂的小于20 µm的颗粒才能发现Al-Cu粉末混合物和LBM固体的持久均匀性。观察到的偏析现象的解释是,随着局部浓度的增加,颗粒的迁移率降低,而较小颗粒的质量降低。主要影响是基于几何形状的,因此预期它们可以转移到其他纳米颗粒,合金成分和粉末床技术(例如粘合剂喷射)中。

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