摘要
Hierarchical and porous complex metal structures have important prospects in biomedical medicine,aerospace,and other important industries.Current processing methods,including conventional and additive manufacturing,still face many challenges in fabricating 3D metal structures with complex internal structures,especially aluminum alloy ones.Metal molten infiltration on the basis of sacrificial salt templates provides a feasible solution for manufacturing complex internal structures of aluminum alloy,and the development of paste for direct ink writing is pivotal for the successful fabrication of salt templates.This study introduces a novel salt-based paste for printing sacrificial templates by direct ink writing.A print analysis model is formulated based on direct ink writing.Model and experimental results show a remarkable link between strut size and printing pressure and moving speed,but no such link exists between strut size and nozzle height.The paste can be printed into various complex structures by direct ink writing devices.Complex structures of aluminum alloys can be fabricated by metal infiltration and leaching of salt templates.This work provides a new reference technology for fabricating aluminum alloys with complex structures in the future.
