| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Ceramic Materials and Processing
|
| Presentation Title |
Cation size and mass modulated multi-stabilizer zirconia with low thermal conductivity |
| Author(s) |
Sairam Ramachandran, Ashutosh Suresh Gandhi |
| On-Site Speaker (Planned) |
Sairam Ramachandran |
| Abstract Scope |
8 mol% tetragonal YSZ undergoes rapid phase transformation at temperatures exceeding about 1250 °C, restricting its service temperature as thermal barrier coatings. Cubic zirconia ceramics are phase-stable across the relevant temperature range and exhibit lower thermal conductivity than tetragonal YSZ. The cation selection criteria, based on inducing significant ionic radii modulation, and atomic mass modulation, have been used to design new compositions. The consequent lattice strain significantly reduces the thermal conductivity of these new cubic zirconia compositions stabilized by 5 to 10 rare earth oxides. Phase identification of synthesized compositions was done by X-ray diffraction, Raman spectroscopy and transmission electron microscopy. Thermal conductivity (κ ~ 0.9 W/(m.K) at 1000 °C) lower than conventional tetragonal YSZ were achieved. A correlation is established between the thermal conductivity and the ionic radii and mass modulation. Coefficients of thermal expansion were measured and evaluated for suitability for high-temperature applications. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Ceramics, High-Temperature Materials, |