| About this Abstract |
| Meeting |
MS&T21: Materials Science & Technology
|
| Symposium
|
Advanced Materials for Harsh Environments
|
| Presentation Title |
High-temperature Stability and Phase Transformations of Titanium Carbide (Ti3C2Tx) MXene |
| Author(s) |
Srinivasa Kartik Nemani, Brian Cecil Wyatt, Bowen Zhang, Babak Anasori |
| On-Site Speaker (Planned) |
Srinivasa Kartik Nemani |
| Abstract Scope |
2D transition metal carbides/nitrides (MXenes) have been explored for energy storage and catalytic applications extensively. However, there is a gap in fundamental understanding of MXenes’ high-temperature phase stability in low oxygen, high-temperature environments. In this study, we evaluated stability of MXenes’ structure and morphology up to 1500 ᵒC in low-oxygen environments. We explored phase transformations in MXene thin films with in-situ x-ray diffraction (XRD) from 700ᵒ-1000 ᵒC and ex-situ annealing via spark plasma sintering. With these methods, we find that Ti3C2Tx MXene transforms to lamellar 3D crystalline ordered carbon vacancy TiCy and its superstructure Ti2C up to 1000 ᵒC and disordered carbon vacancy TiCy above 1000 ᵒC. The grain growth and transformation from nanolamellar hexagonal to lamellar cubic structures of titanium carbide is significant in realizing MXenes’ potential as high-temperature refractory ceramics when added as 2D additives in composites for high-temperature applications. |