Ink Tuning for Direct Ink Writing of Planar Metallic Lattices

316L and Cu-based inks are developed to 3D-printed tetrachiral auxetic structures. The main objectives of the work are to study the effects of powders composition and powder:binder volume ratio on rheological properties and printability of the inks. Following these results, customized Gcode is developed using FullControl Gcode Designer open-source software to 3D print intricate tetrachiral auxetic structures. The results reported in this work show how powder composition (316L versus Cu) has less effect on the inks' rheological behavior than powder size distribution and powders:binder volume ratio. In terms of rheological parameters, the zero-shear rate viscosity mainly affects the capability of the printed ink to retain its shape after printing, while the yield stress affects the printability. The printed and sintered auxetic structures achieve the intended lattice-geometry design.

Automated summary

316L and Cu-based inks were developed for 3D-printing tetrachiral auxetic structures. The study focused on the effects of powder composition and powder:binder volume ratio on the inks' rheological properties and printability. Customized Gcode was developed using FullControl Gcode Designer open-source software to enable the printing of intricate tetrachiral auxetic structures. The results demonstrate that powder size distribution and powders:binder volume ratio have a greater impact on the rheological behavior of the inks than powder composition (316L versus Cu).