ABSTRACT Silicon carbide fiber–reinforced silicon carbide (SiC f /SiC) composites are promising candidates for advanced gas turbines owing to their low density and excellent high‐temperature strength. However, their service temperature is severely limited by oxidation and corrosion in water vapor–rich environments, necessitating the use of environmental barrier coatings (EBCs). Conventional EBCs, such as rare‐earth silicates, provide effective protection up to 1300–1400°C but degrade rapidly above 1500°C due to crystallization of SiO 2 ‐based thermally grown oxides and phase instability. Consequently, robust outer‐layer materials compatible with inner‐layer EBCs are required for multilayer T/EBC systems operating under severe conditions. In this work, perovskite‐type rare‐earth oxides LaYbO 3 and LaY 1/2 Yb 1/2 O 3 are evaluated as candidate outer‐layer T/EBC materials for SiC composites and are found to exhibit thermal expansion coefficients of 7.0–8.5 × 10 − 6 K − 1 , supporting their suitability for such applications. Their low thermal conductivity (≤1.8 W m − 1 K − 1 ) provides effective thermal insulation, while their relatively high hardness and fracture toughness contribute to improved mechanical integrity. These results indicate that perovskite‐type rare‐earth oxides are promising outer‐layer T/EBC materials for enhancing the durability of SiC‐based components under ultra‐high‐temperature conditions.
Jin et al. (Wed,) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: