Vigilancia Tecnológica

This study aims to enhance the rheological behavior of SiC/Clay paste with the use of 3 types of polymers (CMC, PEG, and PVA) to obtain better printability through the Direct ink writing method pastes prepared by stirring polymer solutions with SiC/Clay powders. Rheometry and zeta potential tests are used to characterize pastes properties. 20 x 20 mm scaffolds were 3D printed then dried for 24h at room temperature and sintered at 1300°C for 1h to obtain the mullite phase in the final product.In this study, we investigated the impact of polyethylene glycol, sodium carboxymethyl cellulose, and polyvinyl alcohol on the rheological behavior, printability, and mechanical/physical properties of 3D?printed scaffolds for high?temperature applications using SiC/clay ceramic paste. Employing the Direct Ink Writing method, varying concentrations of each polymer (PEG: 2.5%–10% weight, CMC: .6%–1.8% weight, PVA: .25%–1% weight) were incorporated into the composition. The resulting SiC/clay paste, with adjusted additive content, was used to 3D?print scaffold structures through Direct Ink Writing. Sintering of clay?bonded SiC samples were carried out at 1300°C for 1 h in an ambient atmosphere. The research revealed that altering the additive amounts significantly influenced the rheological behavior, mechanical properties, and physical characteristics of the printed specimens. Notably, the ideal properties with additive concentrations (10% wt PEG, 1% wt PVA, and .6% CMC) were identified, providing the best outcomes in terms of printability and firing results. High density samples with 2.09, 1.93, and 1.79 g/cm3, high compression strength of 20.82, 14.5 and 12.53 MPa with 32.26%, 42.5%, and 52.63% open porosity for samples containing PVA, CMC, and PEG modifiers were obtained, respectively. Additionally, the study led to the development of a high solid loading printable paste with an 80% weight.