About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
|
Grain Boundaries, Interfaces, and Surfaces: Fundamental Structure-Property-Performance Relationships
|
| Presentation Title |
Quantifying Surface and Grain-Boundary Energies in Yttria-stabilized Zirconia: Influence of Grain Size and Sintering Conditions |
| Author(s) |
Mst Sharmin Mostari, Ricardo H. R. Castro |
| On-Site Speaker (Planned) |
Mst Sharmin Mostari |
| Abstract Scope |
This study investigates the coupled effects of grain size and temperature on grain-boundary energy (γs) and surface energy (γgb) in 10 mol% yttria-stabilized zirconia (10YSZ) ceramics to enhance understanding of the thermodynamic driving force for sintering. Differential scanning calorimetry was employed to measure the heat of sintering (ΔHsintering) under varying calcination and sintering conditions. Complementary characterization techniques, including X-ray diffraction, scanning and transmission electron microscopy, enabled a comprehensive analysis of the microstructures. A system of equations was developed using least squares methods to extract values of γs and γgb, with controlled grain sizes used to minimize variable complexity. Results show that both γs and γgb are significantly influenced by increasing temperature and grain size, reflecting changes in sintering stress. These findings suggest that ΔHsintering and microstructural evolution can identify shifts in sintering mechanisms and associated activation energies, offering a framework for optimizing sintering strategies in 10YSZ ceramics. |