Properties Evaluation of a Novel Entropy-Stabilized Ceramic (La0.25Ce0.25Nd0.25Sm0.25)Ti2Al9O19 with Enhanced CMAS Corrosion Resistance for Thermal Barrier Coating Applications
Fuxing Ye, Ziqi Song, Fanwei Meng, Sajid Ali
TL;DR
A new ceramic material, (La0.25Ce0.25Nd0.25Sm0.25)Ti2Al9O19, is developed for thermal barrier coatings with improved corrosion resistance and thermal properties.
Contribution
The paper introduces a novel entropy-stabilized ceramic with enhanced CMAS corrosion resistance for thermal barrier coatings.
Findings
META exhibits low thermal conductivity (1.84 W·(m·K)−1) at 1100 °C.
META shows comparable thermal expansion to yttria-stabilized zirconia and high emissivity in the 2.5–10 μm wavelength range.
META's bi-layer structure and rare-earth doping improve CMAS corrosion resistance by preventing molten infiltration.
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…
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Taxonomy
TopicsHigh-Temperature Coating Behaviors · Advanced materials and composites · Advanced ceramic materials synthesis