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Corrosion study of Alumina/Yttria-Stabilized Zirconia (Al2O3/YSZ) nanostructured Thermal Barrier Coatings (TBC) exposed to high temperature treatment

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Corrosion study of Alumina Yttria-Stabilized Zirconia (Al2O3-YSZ) nanostructured Thermal Barrier Coatings (TBC) exposed to high temperature treatment.pdf (364.79 KB)
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Amaya, C. A.
Aperador Chaparro, William Arnulfo
Zambrano, Gustavo
Espinoza Beltrán, F. J
Caicedo, Julio Cesar
Muñoz Saldaña, Juan
Prieto Pulido, Pedro
Abstract (Spanish)
Se depositaron recubrimientos de barrera térmica (TBC) de circonio estabilizado con itria al 8% (8YSZ) sobre sustratos AISI-304 mediante pulverización catódica por magnetrón r.f.. Se depositó una capa tampón de alúmina, Al2O3, para mejorar la adhesión de la monocapa de YSZ al sustrato. La influencia del recubrimiento de Al2O3/8YSZ en la evolución de la conductancia electroquímica, CTt , se examinó mediante mediciones de Espectroscopía de Impedancia Electroquímica cuando los aceros se exponen a temperaturas de 700 y 500 C durante 2, 4 y 6 h. Los resultados indicaron que CTt disminuyó tres órdenes de magnitud, en las muestras recubiertas con Al2O3/8YSZ con respecto al acero sin recubrir.
Abstract (English)
Thermal Barrier Coatings (TBC) of 8% Yttria-Stabilized Zirconia (8YSZ) were deposited on AISI-304 substrates via r.f magnetron sputtering. A buffer layer of alumina, Al2O3, was deposited to improve the adhesion of the YSZ monolayer to the substrate. The influence of the Al2O3/8YSZ coating on the electrochemical conductance evolution, CT t , was examined by Electrochemical Impedance Spectroscopy measurements when the steels are exposed to temperatures of 700 and 500 C for 2, 4, and 6 h. Results indicated that CT t diminished three orders of magnitude, in samples coated with Al2O3/8YSZ with respect to uncoated steel.
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URI: https://repositorio.escuelaing.edu.co/handle/001/2329
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