THERMOCYCLIC BEHAVIOR OF DIFFERENTLY STABILIZED AND STRUCTURED EB-PVDTHERMAL BARRIER COATINGS

The electron-beam physical vapor deposition (EB-PVD) process provides distinctive coatings of a unique columnar microstructure for gas turbi ne components. Main advantage of this structure is its superior tolera nce against straining, erosion and thermoshock, thus giving it a major edge in Lifetime. This paper outlines the interaction between chemica l composition and microstructural evolution of EB-PVD zirconia-based t hermal barrier coatings (TBCs) and their respective Lifetimes in cycli c burner rig and furnace tests. Customizing TBC microstructure by adju sting EB-PVD processing parameters is emphasized. A structural zone di agram for PVD is modified by interconnecting the influence of substrat e rotation with the microstructural evolutions. Finally, some basic as pects of single source and dual source evaporation are compared.