|About this Abstract
||Materials Science & Technology 2012
||Surface Protection for Enhanced Materials Performance: Science, Technology and Applications
||Effect of Rare-Earth Dopants on Microstructures and Thermal Conductivity of Thermal Barrier Coatings Prepared by Suspension Plasma Spray
||Stephanie Gong, Rodney Trice
|On-Site Speaker (Planned)
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.