ABSTRACT

The deposition window of cold spray additive manufacturing (CSAM) a high-entropy alloy (HEA) was optimised by investigating processing parameters on deposition efficiency and porosity. The optimal parameters were obtained with helium as the driving gas, gas inlet temperature was at 700°C, and spray distance at 25 mm, at which the deposit was the thickest and of the lowest porosity. The type of driving gas is critical as it affects the porosity and deposition efficiency, and helium is required to obtain high-quality HEA deposits. With it, gas inlet temperature and spray distance have a minimal effect. Furthermore, higher gas temperature and moderate spraying distance were selected to increase particle deformation and reduce the effect of shock waves at the plate front.

摘要

通过研究沉积效率和孔隙率的工艺参数，优化了高熵合金 (HEA) 冷喷涂增材制造 (CSAM) 的沉积窗口。以氦气为驱动气体，进气温度为700℃，喷射距离为25mm，此时沉积层最厚，孔隙率最低，得到了最佳参数。驱动气体的类型至关重要，因为它会影响孔隙率和沉积效率，并且需要氦气才能获得高质量的 HEA 沉积物。有了它，进气温度和喷射距离的影响最小。此外，选择较高的气体温度和适中的喷射距离，以增加颗粒变形并减少板前冲击波的影响。