Comparison study of Environmental Barrier Coatings produced using APS and Electrophoretic Deposition

Electrophoretic deposition (EPD) were used to produce ytterbium silicate environmental barrier coatings (EBCs) on SiC and Si bond coat with uniform coatings with control microstructure. The EBCs produced via EPD and that from air plasma spray (APS) were exposed to steam environments at high temperature. Then they were examined with use electron microscopy for microstructure characterisation, indentation for mechanical characterisation and Raman spectroscopy for residual stress measurements. There have been significant difference in microstucture evolution, TGO growth and TGO/EBC interface in EBCs produced with use of APS and EPD respectively. These findings indicate the degradation and failure mechanisms of APS EBCs and underscore the potential of EPD technique in produce Yb2Si2O7 EBCs with enhanced performance.