等离子球化钼粉3D打印工艺适配性研究

Study on the Suitability between Technological Parameters of 3D Printing and Molybdenum Powder by Plasma Spheroidizing

由于钼的熔点高,利用3D打印加工钼制品较为困难,目前相关研究较少。为了深入了解3D打印钼制品,本文对激光功率及扫描速率对钼制品性能及内部缺陷的影响展开研究。研究发现,随着激光功率的升高、扫描速率的下降,激光能量密度逐渐升高,钼颗粒之间粘结效果变好,钼制品较为致密。但是,在选择性激光熔化过程中,样品内部还会产生封闭孔洞、裂纹等缺陷,对样品性能产生不利影响。经过比较,以等离子球化钼粉为原料,激光功率100W,扫描速率500mm/s,间距0.08mm作为3D打印的参数,制得的钼制品性能最优,其密度为9.82g/cm3,相对密度为96.27%。

3D printing of molybdenum is still challenging due to the high melting point of molybdenum.There are rarely studies that focused on the 3D printing of molybdenum.In order to further understand the 3D printed molybdenum products,the effects of laser power and scanning rate on the performance and internal defects of molybdenum products were studied in this paper.It was found that with the increase of laser power and the decrease of scanning rate,the laser energy density gradually increased,the bonding effect between molybdenum particles became better,and the molybdenum products were relatively compact.However,in the process of selective laser melting,there will be closed holes,cracks and other defects inside the sample,which will adversely affect the performance of the sample.After comparison,with plasma spheroidal molybdenum powder as raw material,laser power of 100W,scanning rate of 500mm/s and spacing of 0.08mm as 3D printing parameters,the molybdenum products obtained exhibits best performance.The density and relative density is 9.82g/cm3 and 96.27%respectively.