Strengthening SiC Ceramic Structural Integrity Made via 3D Printing with Pyrolysis and Precursor Infiltration

Abstract

3D printing, particularly direct ink writing (DIW), offers a different approach to crafting intricate ceramic structures. Here, 3D printing technology (direct ink writing (DIW)) based on extrusion has been utilized to fabricate SiC ceramic structures. The particle size, binder composition, and printing conditions were optimized to fabricate high-strength green structures. The mechanical properties of the 3D-printed SiC green structure were infiltrated with the liquid precursor, which filled the porous part of the structure. The composite is fired at a higher temperature, which results in the formation of SiC from the liquid precursor, demonstrating improved surface morphology, strength, density, and thermal properties of the printed structures. The 3D-printed SiC composite structures show an increase in mechanical strength up to 600% stronger as compared to the pristine SiC structures. Furthermore, the infiltrated, sintered composite demonstrates superior thermal properties, notably improved heat dissipation, in contrast to noninfiltrated samples, rendering it well-suited for high-temperature applications. This method presents a promising avenue for manufacturing advanced SiC components with superior properties.