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This study examines the impact of adding yttria (Y₂O₃) nanoparticles (10-50 nm, 0.5-2 wt%) to yttria-stabilized zirconia (YSZ) thermal barrier coatings (TBC) on the cyclic oxidation resistance of nickel-based superalloys (CMSX-4) at 1100-1200°C. Coatings were applied using atmospheric plasma spraying (APS), and cyclic oxidation tests were conducted in dry air, 10% water vapor, and sulfur-containing (500 ppm SO₂) environments. Results indicated that 1 wt% Y₂O₃ reduced the thermally grown oxide (TGO) growth rate by 32% and improved its adhesion by 38%. In water vapor, hydroxide formation increased corrosion rates, but Y₂O₃ mitigated this effect by   20%. Coating toughness with 1 wt% Y₂O₃ reached 5/8 MPa m√2, a 38% increase over standard YSZ (4/3 MPa m√2). Thermal stress simulations confirmed a 20% reduction in compressive stresses. The improved coating exhibited lower weight gain, indicating enhanced stability. These findings are relevant for designing durable coatings for high-efficiency gas turbines, reducing maintenance costs.

Keywords: Thermal Barrier Coatings, Yttria Nanoparticles, Cyclic Oxidation, Nickel-Based Superalloys, TGO Adhesion

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