Physicochemical Properties of Sm2O3–ZrO2–HfO2 Ceramics for the Development of Promising Thermal Barrier Coatings

In continuation of our systematic study of the options of the development of high-performance thermal barrier coatings based on three-component ceramic materials comprising rare-earth oxides, we report on the effects of component concentrations on the thermophysical properties of ceramics based on the Sm 2 O 3 –ZrO 2 –HfO 2 system. Samarium oxide is found to stabilize these ceramics when its concentration is higher than 22.5 mol % and zirconium oxide concentration is lower than 56.7 mol %. The temperature coefficient of linear expansion (TCLE) of the studied ceramic materials in the temperature range 20–1400°С can reach α L = (10.4 ± 0.6) × 10 –6 with acceptable values of the thermal conductivity coefficient at a level of 0.56–0.84 W/(m K).