Abstract
The effect of components of ceramics in the Sm2O3–Y2O3–HfO2 system on their thermophysical properties was studied. It was shown that the most stable materials at 1400°C are ternary ceramics in the system under investigation that contain ≤12.5 mol % Sm2O3; the thermal conductivity of these materials does not exceed 1.3 W/(m K). Increasing samarium oxide content in samples in the Sm2O3–Y2O3–HfO2 system was found to lead to significant changes in phase equilibria at temperatures ≥1000°C. The effect of the contents of individual components of the studied ceramics on the thermal conductivity and the linear thermal expansion coefficient, which largely determine the suitability of a ceramic material for using in a thermal barrier coating. It was shown that the addition to 12.5 mol % samarium oxide ensures the stability of the linear thermal expansion coefficient at acceptable values of the thermal conductivity of 0.8–1.6 W/(m K).
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This work was supported by the Russian Foundation for Basic Research (project no. 19-03-00721).
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Kablov, E.N., Doronin, O.N., Artemenko, N.I. et al. Investigation of the Physicochemical Properties of Ceramics in the Sm2O3–Y2O3–HfO2 System for Developing Promising Thermal Barrier Coatings. Russ. J. Inorg. Chem. 65, 914–923 (2020). https://doi.org/10.1134/S0036023620060078
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DOI: https://doi.org/10.1134/S0036023620060078