Galindo E, Espiritu E R L, Gutierrez C, Alagha Ali N, Hudon P, Brochu M
Department of Mining and Materials Engineering, McGill University, 3610 University Street, Montreal, QC, H3A 0C5, Canada.
Sci Rep. 2024 Jul 16;14(1):16439. doi: 10.1038/s41598-024-67295-0.
A new method to assess the quality of additive manufacturing (AM) metal powders using the triboelectric charging concept is demonstrated using CpTi, Ti6Al4V, AlSi10Mg, IN 738, and SS 316L powders. For each powder tested, the surface chemical composition was first analyzed using X-ray photoelectron spectroscopy (XPS) to determine the composition of the passivation layer. Some modifications to the current GranuCharge™ setup, developed by GranuTools™, were then performed by incorporating a flow rate measuring tool to assess how tribocharging is affected as a function of flow rate. Variations in the tribocharging response have been found with the flow rate of CpTi, AlSi10Mg and SS 316L powders. Moreover, results suggest that the tribocharging behavior might not be the same even with powders fabricated with the same passivation process. Finally, the compressed exponential model of Trachenko and Zaccone was used to reproduce the tribocharging behavior of the powders. The models were found to work best when the stretch constant β = 1.5, which is identical to the value found in other systems such as structural glasses, colloidal gels, entangled polymers, and supercooled liquids, which experience jamming when motion of individual particles become restricted, causing their motion to slow down.
采用摩擦起电充电概念评估增材制造（AM）金属粉末质量的一种新方法，通过使用CpTi、Ti6Al4V、AlSi10Mg、IN 738和SS 316L粉末进行了演示。对于每种测试粉末，首先使用X射线光电子能谱（XPS）分析其表面化学成分，以确定钝化层的组成。然后，对GranuTools™公司开发的当前GranuCharge™装置进行了一些改进，加入了一个流速测量工具，以评估摩擦起电如何随流速变化。已发现CpTi、AlSi10Mg和SS 316L粉末的摩擦起电响应随流速而变化。此外，结果表明，即使是采用相同钝化工艺制造的粉末，其摩擦起电行为也可能不同。最后，使用Trachenko和Zaccone的压缩指数模型来再现粉末的摩擦起电行为。当拉伸常数β = 1.5时，发现该模型效果最佳，这与在其他系统（如结构玻璃、胶体凝胶、缠结聚合物和过冷液体）中发现的值相同，当单个颗粒的运动受到限制导致其运动减慢时，这些系统会发生堵塞。
