High Temperature Erosion Behaviour of Thermal Barrier Coating Produced by Two Different Spraying Gun

Thermal barrier coatings (TBCs) are used in gas turbines and aerospace engines to prevent high engines metallic section at high temperatures. Additionally, TBCs increases the gas turbines engines efficiency by increasing combustion temperature while substrate temperature is stationary. Present thermal barrier coatings; generally consist a bond coat and a partially stabilized zirconia (ZrO₂ + %8 Y₂O₃) top coat onto a nickel based super alloy. In gas turbine’s combustion chambers, TBCs are eroded result of consistently impacting combustion product and dust which comes from atmosphere.

ZrO₂ + %8 Y₂O₃ and a MCrAlY bond coat system has selected for investigation. Coating produced by using two different spraying guns. Erosion tests performed at 900°C and 25°,50°, 90° degrees. After erosion tests coatings are characterized by using SEM, Optical Microscope and AFM.