About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
|
Additive Manufacturing of Ceramic-Based Materials: Process Development, Materials, Process Optimization and Applications
|
| Presentation Title |
Plasma Jet Oxidation of Additively Manufactured Monolithic and High Entropy Ultra High Temperature Ceramic Carbides |
| Author(s) |
Varad Agarwal, Ambreen Nisar |
| On-Site Speaker (Planned) |
Varad Agarwal |
| Abstract Scope |
This study compares the additive manufacturing and high-temperature oxidation behavior of monolithic tantalum carbide (TaC) and a high-entropy ultra-high temperature carbide (HE-UHTC) system fabricated via Direct Ink Writing (DIW). The HE-UHTC mix was composed of equimolar tantalum carbide (TaC), niobium carbide (NbC), hafnium carbide (HfC), and titanium carbide (TiC) powders, enabling a higher solid loading (92 wt%) than TaC (87 wt%) and improved extrusion and shape retention. Printing parameters were individually optimized. After sintering at 1900 °C under vacuum, densification of TaC reached ~90%, while HE-UHTC achieved ~98%. X-ray diffraction revealed the formation of stable multi-component carbide solid solutions in the HE-UHTC. Mechanical properties were evaluated via uniaxial compression and nanoindentation. Oxidation and ablation resistance were assessed using plasma arc testing to simulate atmospheric re-entry. This study highlights key processing–structure–property relationships and demonstrates the promise of high-entropy UHTCs for advancing thermal protection systems for extreme environment applications. |