A novel experimental approach to quantitatively evaluate the printability of inks in 3D printing using two criteria

Material extrusion enables deposition of filaments with designed structures, and such sub-categories as direct ink writing brings increasing possibilities for the fabrication multi-material complex-shaped high-performance fully dense components. It has been well understood that critical requirement successful is printability inks. To address this challenge, a novel experimental approach takes advantages developed rotational rheology test capillary test, proposed to evaluate inks were prepared from water-based slurries Al2O3, Y2O3 Nd2O3 ceramic powders according stoichiometry ratio Y3Al5O12/Y2.982Nd0.018Al5O12 different additions hydroxyethyl cellulose. The parameters including low strain value (0.4%) within linear viscoelastic region high shear rate (85 s-1) have determined by amplitude sweep theoretical analysis. Two criteria - storage modulus stress first introduced assess success applicable in writing. Using these criteria, excellent qualities printable quantitatively defined values range 2300–6000 Pa 401–430 Pa, respectively. Moreover, results experiments provided useful insight into technology development suppressing appearance bubbles. Finally, correctness further examined another transparent ink, in-line transmittance (84.4%) at 1064 nm close observed.