Double-ceramic-layer thermal barrier coatings based on La2(Zr0.7Ce0.3)2O7/La2Ce2O7 deposited by electron beam-physical vapor deposition (original) (raw)

Double-ceramic-layer (DCL) thermal barrier coatings (TBCs) of La2(Zr0.7Ce0.3)2O7 (LZ7C3) and La2Ce2O7 (LC) were deposited using electron beam-physical vapor deposition (EB-PVD). This research investigates the composition, interdiffusion, surface and cross-sectional morphologies, and cyclic oxidation behavior of the DCL coating. Analytical techniques such as energy dispersive spectroscopy and X-ray diffraction reveal successful fabrication and highlight chemical compatibility issues, particularly the formation of LaAlO3 due to reactions with the thermally grown oxide layer. The findings indicate that thermal cycling durability is compromised by interdiffusion effects and surface sintering, pointing towards the necessity for further advancements in TBC material performance for high-temperature applications.