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

Abstract:

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, Al<inf>2</inf>O<inf>3</inf>, was deposited to improve the adhesion of the YSZ monolayer to the substrate. The influence of the Al<inf>2</inf>O<inf>3</inf>/8YSZ coating on the electrochemical conductance evolution, C<inf>t</inf>^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 C<inf>t</inf>^T diminished three orders of magnitude, in samples coated with Al<inf>2</inf>O<inf>3</inf>/8YSZ with respect to uncoated steel. © 2009 Elsevier Ltd.

Año de publicación:

2009

Keywords:

• thin films
• Electrochemical impedance spectroscopy
• yttria-stabilized zirconia
• Thermal Barrier Coatings

Fuente:

scopus