|About this Abstract
||MS&T22: Materials Science & Technology
||Advanced Materials for Harsh Environments
||New Strategies for Designing Colloidal Inks for Additive Manufacturing of UHTCs
||Julia Noel Goyer, Carolina Tallon
|On-Site Speaker (Planned)
||Julia Noel Goyer
Increased shaping capacity for Ultra-High Temperature Ceramics (UHTCs) is paramount to their desired use in thermal protection systems for hypersonic vehicles. Through understanding of colloidal processes such as gelcasting and slip casting, an array of colloidal inks can be designed for ceramic additive manufacturing. This work compares inks that solidify by different mechanisms such as solvent evaporation, chemical curing, or yield stress rheology, and modeled the rheological behavior upon deposition. Layer adhesion and in-layer homoegeneity have been compared in addition to differences in green properties between additive and colloidal routes that utilize identical formulations. Colloidal routes using Zirconium Diboride have achieved >60% green density, and in gelcasting, showed a compressive green strength above 4 MPa, an order of magnitude increase compared to slip casting. The combination of advanced additive manufacturing ink development with different consolidation mechanisms has the potential of opening up new avenues for more cost-effective manufacturing of UHTCs.