熔丝打印多孔钨的组织及孔隙特性研究

Research on the Microstructure and Pore Characteristics of Fused Filament-Fabricated Porous Tungsten

摘要:

采用熔丝制造（fused filament fabrication，FFF）技术制备多孔钨构件，研究和表征了FFF打印的各阶段组织形貌以及最终多孔钨的孔隙特性。结果表明，采用FFF技术成功制备了层间结合紧密、无缺陷的多孔钨构件。3 μm商业钨粉的最大装载量可达到56%，混炼后的喂料表现出良好的流变性能。此外，研究了打印参数对生坯致密度的影响，得到了最佳的打印参数：喷嘴直径为0.6 mm，层厚为0.1 mm，打印速度为30 mm/s。FFF打印制备的多孔钨表现出均匀的孔隙分布。随着烧结温度的升高，多孔钨孔径减小，孔隙复杂程度增加，硬度和抗压缩强度升高。

Abstract:

Porous tungsten structures were prepared by fused filament fabrication (FFF). The microstructural evolution at each stage of the FFF process and the final pore characteristics of the sintered tungsten were investigated systematically. The results show that porous tungsten components with tightly bonded layers and no defects are successfully prepared by FFF. The maximum loading of commercial tungsten powder with a particle size of 3 μm reaches 56%, and the compounded feedstock exhibits excellent rheological properties. Furthermore, the influence of printing parameters on the green density was investigated, identifying the optimal combination: the nozzle diameter of 0.6 mm, a layer thickness of 0.1 mm, and the printing speed of 30 mm/s. The porous tungsten prepared by FFF shows a uniform pore distribution. As the sintering temperature increases, the average pore size decreases, the complexity of the pores increases, and the hardness and compressive strength increase.