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 °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 La 2 O 3 -modified YSZ powders were deposited by atmospheric plasma spraying and their microstructures were investigated. The results show that the La 2 O 3 addition can effectively alleviate the grain growth of coatings under high temperatures.