Extrusion-based 3D printing alumina-silica inks: Adjusting rheology and sinterability incorporating waste derived nanoparticles

• Published in: Journal of the European Ceramic Society 2023-09, Vol.43 (11), p.4865-4876
• Main Authors: Hossain, Sk S., Son, Hyeon-Jin, Park, Sujin, Bae, Chang-Jun
• Format: Article
• Language: English
• Subjects: Al2O3-SiO2; Direct ink writing; Nanoparticle; Rheology; Sintering
• ISSN: 0955-2219; 1873-619X
• DOI: 10.1016/j.jeurceramsoc.2023.03.068

The nanoparticle (NP) exhibits numerous distinctive and extraordinary properties than micron level and up. The inclusion of NP effects in the rheological and densification behavior of extrusion-based (direct ink writing (DIW)) inks has been extensively investigated. The aqueous-based alumina-silica inks were first designed using waste rice husk ash (RHA) derived nano-silica (NS) (0–10 wt%) and found that the solid-to-liquid ratio reduces continuously with NS addition for printable rheology. For functionalization of NS, dispersant requirement is increased that improve the solids loading of inks. Second, the optimized inks are printed via DIW technique and sintered at a temperature of 1400–1650 °C. The NS has remarkably enhanced the shrinkage, density, and morphology of sintered DIW specimens and 7.5 wt% RHA NS reduces the sintering temperature ∼150 °C. Incorporating NP in the 3D printing ink is a clean approach to filling pores generated by binder-burnout and fabricating a dense ceramic at a low temperature. [Display omitted] •Printable direct ink writing ink is designed using waste derived nanoparticle (NP).•Solids volume fractions need to reduce for develop a printable ink with NP.•Dispersant need increases for functionalization of ink particles with NP.•NP contributes a faster sintering rate and reduces the sintering temperature.•NP enables to develop of a 3D printed dense ceramic at a low temperature.