PREP工艺参数对3D打印用AlSi10Mg铝合金粉末性能的影响

Effect of PREP Process Parameters on Properties of AlSi10Mg Aluminum Alloy Powder for 3D Printing

利用等离子旋转电极雾化技术(PREP)制备了AlSi10Mg铝合金粉末,研究了电极棒转速、直径、等离子弧电流及雾化介质对粉末性能的影响。结果表明,粉末粒度随着电极棒转速与直径的增大而减小,粒度呈正态分布,主要集中在74~150μm。随着电流的增大,片状粉末增加,在电流为360A时片状粉末Si、Mg元素烧蚀严重。增大雾化介质中氦气比例,粉末冷却速度增加,粉末粒度略微细化。通过粉末扫描电子显微镜(SEM)形貌发现,粉末表面为发达的花瓣状胞状晶组织,后期可以增大氦气比例加快粉末冷却速度,得到表面更加光滑的球形粉末。

AlSi10Mg aluminum alloy powder was prepared by Plasma Rotating Electrode Process (PREP). The effects of electrode rod rotation speed, diameter, plasma arc current, and atomization medium on powder properties were studied. The results show that the particle size of the powder decreases with the increase of the rotation speed and the diameter of the electrode rod, and the particle size is normally distributed, mainly concentrated between 74 and 150 μm. As the current increases, the flake powder increases, and when the current is 360 A, the flaky powder Si and Mg elements are ablated severely. Increasing the proportion of helium in the atomizing medium increases the cooling rate of the powder and slightly refines the particle size of the powder. It was found by powder Scanning Electron Microscopy (SEM) morphology that the surface of the powder was a well-developed petal-like cell structure, and the proportion of helium was increased in the later stage to accelerate the cooling rate of the powder, and a spherical powder with a smoother surface was obtained.