Abstract
Zirconates of rare earth elements with a pyrochlore-type structure, as a class of ceramics with low thermal conductivity, are among the most promising materials for a ceramic layer in thermal barrier coatings (TBCs) for gas turbine engines with operating temperatures above 1200°C. The paper presents an overview of studies focusing on the development of the upper Gd2Zr2O7 TBC layer. The microstructural design of these materials is based on the ZrO2–Gd2O3–Al2O3 phase diagram. Methods for increasing the fracture toughness of Gd2Zr2O7 materials and preventing the interaction of Gd2Zr2O7 and Al2O3 formed in TBC operation are presented. The features of multilayer and functional gradient coatings are addressed. Complex improvement of the composition, architecture, and deposition of the coatings ensures the properties required for long-term operation of Gd2Zr2O7 TBCs.
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