Microstructure of Plasma Sprayed La2O3-Modified YSZ Coatings

Yttria-stabilized zirconia (YSZ) has received great attention as a thermal barrier coating (TBC) material for its excellent thermal and mechanical properties. However, the grain growth of YSZ, particularly under temperatures higher than 1200 degrees C, limits its further applications to a great extent. In our present study, to develop better understanding of the aforementioned phenomenon and explore effective methods to conquer this challenge, TBCs using traditional and La2O3-modified YSZ powders were deposited by atmospheric plasma spraying and their microstructures were investigated. The results show that the La2O3 addition can effectively alleviate the grain growth of coatings under high temperatures.