preparation of high-solid filled alumina inks for stereolithography 3d printing process

In ceramic additive manufacturing, it is important to fabricate parts with high solid contents to guarantee defect-free sintered parts. in stereolithography, low viscosity and especially shear-thinning behavior of the ink are the key factors in producing ceramic-resin parts. therefore, there should be a correlation between solid loading and viscosity. in this study, alumina-glass inks were printed using bottom-up and top-down approaches, and the rheological properties were investigated. the main objective of this study was to print a highly filled ceramic-resin part with a viscosity suitable for dlp printing. while use of suspensions with low viscosity was recommended for top-down digital light processing (dlp) printing, a new setup was designed to study the feasibility of the top-down approach for pastes for the top-down approach. according to the findings, ceramic-resin pastes with the solid content of maximum 75 wt% and viscosity of 47.64 pa.s at the shear rate of 30 s-1 were easily printable via our hand-made top-down dlp printer. however, it was not possible to print inks with solid contents more than 60 wt% using the bottom-up dlp, mainly because the detachment force grew dramatically with an increase in viscosity