Zirconate-based double ceramic layer system of thermal barrier coatings (TBC)

Ceramic coatings used in high-temperature applications, focusing on their behaviour under thermal stress and their ability to resist oxidation. The aim of this project is to evaluate on how these coatings can prevent cracks caused by oxidation at the thermally grown oxide (TGO) layer. Two types of samples which single ceramic layer and double ceramic layer thermal barrier coating (TBC) were prepared using Atmospheric Plasma Spray (APS). The high temperature oxidation was conducted on ceramic-coated samples exposed to 600°C in electric furnace and subsequent cooling. The outcomes of this study will contribute to the development of ceramic coatings with enhanced resistance to oxidation, particularly in high temperature environments. The findings provide insights into the factors influencing the formation and growth of TGO layer and contribute to the prevention of cracks caused by oxidation. The study compared the oxidation resistance of single-layer YSZ (Yttria-Stabilized Zirconia) and double-layer LZ/YSZ (Lanthanum Zirconate/Yttria-Stabilized Zirconia) thermal barrier coatings (TBCs) under high-temperature conditions (600°C). The findings revealed that the double-layer LZ/YSZ coating demonstrated better resistance to oxidation, as indicated by lower weight changes and thinner thermally grown oxide (TGO) layers, compared to the single-layer YSZ coating. This suggests that the LZ/YSZ coating offers improved protection against oxidation and better performance in extreme temperature environments. This research holds practical implications for industries relying on high-temperature applications. It establishes a foundation for further advancements in ceramic coatings, with the objective of improving material performance and extending the lifespan of components operating in extreme conditions.