Work

Properties Evaluation of a Novel Entropy-Stabilized Ceramic (La0.25Ce0.25Nd0.25Sm0.25)Ti2Al9O19 with Enhanced CMAS Corrosion Resistance for Thermal Barrier Coating Applications

Year: 2025

Type: article

Abstract: In this work, a novel potential thermal barrier coating material entropy-stabilized titanium–aluminum oxide (La0.25Ce0.25Nd0.25Sm0.25)Ti2Al9O19 (META) was successfully synthesized by the solid-state reaction method, and its thermophysical properties, phase stability, infrared emissivity, mechanical properties, and CMAS corrosion resistance were systematically investigated. The results demonstrated that META exhibits low thermal conductivity at 1100 °C (1.84 W·(m·K)−1), with a thermal expansion coefficient (10.50 × 10−6 K−1, 1000–1100 °C) comparable to yttria-stabilized zirconia (YSZ). Furthermore, META displayed desirable thermal stability, high emissivity within the wavelength range of 2.5–10 μm, and improved mechanical properties. Finally, META offers superior corrosion resistance due to its excellent infiltration inhibiting. The bi-layer structure on the corrosion surface prevents the penetration of the molten CMAS. Additionally, doping small-radius rare-earth elements thermodynamically stabilizes the reaction layer. The results of this study indicate that (La0.25Ce0.25Nd0.25Sm0.25)Ti2Al9O19 has the potential to be a promising candidate for thermal barrier coating materials.

Source: Materials

DOI: 10.3390/ma18081778

Authors: Fuxing Ye, Ziqi Song, Fanwei Meng, Sajid Ali

Institution: Tianjin University

Language: English

Topic: High-Temperature Coating Behaviors

Subfield: Aerospace Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $3,137

Funders: National Natural Science Foundation of China, National Key Research and Development Program of China