| About this Abstract |
| Meeting |
Materials Science & Technology 2012
|
| Symposium
|
Surface Protection for Enhanced Materials Performance: Science, Technology and Applications
|
| Presentation Title |
Effect of Rare-Earth Dopants on Microstructures and Thermal Conductivity of Thermal Barrier Coatings Prepared by Suspension Plasma Spray |
| Author(s) |
Stephanie Gong, Rodney Trice |
| On-Site Speaker (Planned) |
Stephanie Gong |
| Abstract Scope |
Thermal barrier coatings (TBCs) with low thermal conductivity (kth) improve the efficiency of gas turbine engines by allowing higher operating temperatures. Recent research has reported that the addition of a pair of rare-earth oxides with equal ratio can reduce the kth of the 8 wt.% yttria-stabilized zirconia (YSZ) coatings. In the present work, rare-earth doped coatings have been fabricated via suspension plasma spray (SPS) by dissolving rare-earth nitrates into YSZ powder-ethanol suspensions prior to spraying. Coatings with different amounts or types of rare-earth dopant pairs were prepared to study the effect of different rare-earth dopant pairs (Nd/Yb, Nd/Gd, Yb/Gd) on YSZ coating properties. The microstructures of the coatings were characterized by scanning electron microscope and transmission electron microscope. X-ray diffraction was used to study the thermal stability of the coatings. In this presentation, the relationship between the microstructures and kth of the coatings will be discussed. |
| Proceedings Inclusion? |
Undecided |