About this Abstract |
Meeting |
MS&T21: Materials Science & Technology
|
Symposium
|
Advanced Materials for Harsh Environments
|
Presentation Title |
Novel Non-aqueous Gelcasting of UHTCs for Advanced Complex Shape Manufacturing |
Author(s) |
Julia Noel Goyer, Carolina Tallon |
On-Site Speaker (Planned) |
Julia Noel Goyer |
Abstract Scope |
Advanced manufacturing and complex shaping are paramount to widen applications of Ultra-High Temperature Ceramics (UHTCs) in extreme environments. Significant interest has been garnered in colloidal processing techniques that allow complex shaping and microstructural design to tailor properties. In this work, zirconium diboride (ZrB2) has been processed with a novel formulation for non-aqueous gelcasting. The HEMA-MBAM system was effective in organic solvents such as N,N-dimethylformamide (DMF) leading to concentrated stable suspensions with low viscosity with the addition of gelcasting monomers. DMF was selected after optimization of interparticle forces. The UHTC green samples produced with this system maintained sharp edges following demolding after only 30 minutes. The gelation time and other gel characteristics were studied using oscillatory rheology. The green samples were characterized in terms of density, microstructure and strength. These promising results open the door to new component geometries, architectures and microstructures for UHTC materials and other non-oxide ceramics. |