About this Abstract |
| Meeting |
MS&T26: Materials Science & Technology
|
| Symposium
|
Advanced Materials for Harsh Environments
|
| Presentation Title |
Effect of High Valence Doping on High Temperature Properties of Zirconia |
| Author(s) |
Dominick Leonardi, Mario Caccia |
| On-Site Speaker (Planned) |
Dominick Leonardi |
| Abstract Scope |
Yttria stabilized zirconia (YSZ) is a commonly used thermal barrier coating (TBC) material, used to protect surfaces in turbine engines and power generation systems from heat due to its low thermal conductivity. However, when yttrium replaces zirconium on the zirconium sublattice sites, it creates oxygen vacancies that act as oxygen ion carriers through the coating. These oxygen ions attack the metal substrate that the YSZ is applied to, making YSZ a poor thermal oxygen barrier at high temperatures. The current work aims to study the effect of high valence dopants on the oxygen vacancy concentration in stabilized zirconia by doping and co-doping with ceria and niobia for increased environmental stability by controlling defect formation and concentration through controlled composition. The goal of this work is to improve zirconia based TBCs to become better barrier coatings by reducing oxygen ion conductivity to offer protection against oxidation at high temperatures. |