Sintering and Thermal Shock Behavior of Yttria-Stabilized Zirconia Coating Deposited by Electrophoretic Method On Inconel 738LC Superalloy

摘要

In this study, the MCrAlY bond coat was deposited on Inconel 738LC using the atmospheric plasma spraying method. Then, the 3 mol% yttria-stabilized zirconia nanoparticles were coated on the material using the electrophoretic deposition method at 50 V for 3 min. subsequently the samples were sintered for 2 h at 900, 1000, 1100, and 1200 degrees C. The results revealed that the adhesion of the topcoat was improved by introducing proper roughness on the substrate surface. Also, the sintering temperature of 1000 degrees C was found to be optimal, providing the heat for the surface melting, necking formation, and particle binding. The sample did withstand up to 118 thermal cycles. The cracks were initiated from the sample edges and propagated through the coating. The nucleation and growth of the cracks were primarily due to the difference in the coefficient of thermal expansion (CTE) of the metallic and ceramic layers.