Z. Li , X.G. Hu , Y. Zhou , W.Y. Qu , L.J. Wen , X.X. Meng , Z. Xu , C. Guo , H.X. Lu , Q. Zhu
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引用次数: 0
摘要
热塑性塑料的材料挤出增材制造之所以如此先进,是因为其流变特性可调,因而具有合适的可印刷性,而金属则缺乏这种特性。尽管半固态改性和粘合剂间接改性可用于实现金属挤压打印,但不可控的流动行为和冶金缺陷使得弥合这一差距具有挑战性。本研究首次提出了混合粉重熔和印刷适性评估方法,在不添加填料或聚合物载体的情况下,生产出具有预先设计的微观结构和合适印刷适性的金属浆料。具体而言,通过重熔由 SnBi58 粉末和纯 Sn 粉末组成的混合粉末,获得了次共晶 Sn-Bi 金属浆料。研究了不同温度下的微观结构特征,证明了微观结构预先设计的能力。此外,还利用先进的流变仪评估了印刷适性,包括稳定性、挤出性和成型性。浆料制备和印刷适性评估相结合,为改进参数以获得结构保真度提供了可靠的方法。
Metallic slurry preparation and printability assessment for material extrusion additive manufacturing
Material extrusion additive manufacturing of thermoplastics is so advanced due to the tunable rheological properties and hence a suitable printability, which is deficient for metals. Even though semi-solid modification and binder indirect modification are used to realize metal extrusion printing, the uncontrollable flow behavior and the metallurgical defects make it challenging to bridge this gap. In this study, mixed powder remelting and printability assessment were first proposed for producing metallic slurry with pre-designed microstructure and suitable printability without adding fillers or polymer carriers. Specifically, the hypoeutectic Sn-Bi metallic slurry was obtained by remelting the mixed powder composed of SnBi58 powder and pure Sn powder. The microstructural characteristics at different temperatures were investigated, demonstrating the ability of microstructure predesign. Furthermore, the printability, including stability, extrudability, and buildability, was evaluated by an advanced rheometer. The combined slurry preparation and printability assessment provides a reliable method for parameters improvement to obtain the structural fidelity.