Abstract
Thermal barrier coatings (TBCs) made of Y 2O 3- stabilized ZrO 2 are used extensively to protect and insulate the metallic structure of advanced gas turbine engines. For applications that require prolonged exposure to temperatures above 1000-1200°C, structural changes produced by sintering and phase transformation limit the durability of the coatings. The objective of the present study was to investigate the use of Gd 2O 3 as an alternative stabilizer for ZrO 2based TBC materials. The influence of Gd 2O 3 concentration (4-20 mole percent) on the sintering and phase stability of plasma-sprayed ZrO 2 powders was investigated and the data were compared with those for Y 2O 3-stabilized ZrO 2. At an equivalent concentration (4 mole percent), Gd 2O 3-stabilized ZrO 2 sintered more slowly but had a lower resistance to destabilization of the metastable tetragonal (t') phase, when compared to Y 2O 3-stabilized ZrO 2. The thermal conductivity of Gd 2O 3-stabilized ZrO 2 was lower than that for Y 2O 3-stabilized ZrO 3. Mechanisms for the effect of Gd 2O 3 on the behavior of ZrO 2 are discussed.
| Original language | English |
|---|---|
| Pages (from-to) | 21-28 |
| Number of pages | 8 |
| Journal | Ceramic Engineering and Science Proceedings |
| Volume | 26 |
| Issue number | 3 |
| State | Published - 2005 |
| Externally published | Yes |
| Event | 29th International Conference on Advanced Ceramics and Composites - Cocoa Beach, FL, United States Duration: Jan 23 2005 → Jan 28 2005 |