Sorry, you need to enable JavaScript to visit this website.

Processing, microstructure and mechanical properties of air plasma-sprayed ceria-yttria co-stabilized zirconia coatings

TitleProcessing, microstructure and mechanical properties of air plasma-sprayed ceria-yttria co-stabilized zirconia coatings
Publication TypeArticolo su Rivista peer-reviewed
Year of Publication2010
AuthorsAlfano, M., Di Girolamo G., Pagnotta L., and Sun D.
JournalStrain
Volume46
Pagination409-418
ISSN00392103
KeywordsAir plasmas, ceria-yttria stabilized zirconia, Cerium compounds, Coating microstructures, Component life, Elastic moduli, Elasticity, Gas turbine engine, Gas turbines, hardness, High temperature, Hot corrosion, Image analysis, Material property, Mechanical components, Mechanical properties, Micromechanical model, Microstructure, Microstructure and mechanical properties, Nanoindentation, Phase analysis, Plasma jets, plasma spray, Plasma spraying, Plasmas, Resonant methods, Scanning electron microscopy, SEM, Sprayed coatings, Stabilized zirconia, Strain tolerance, Stress levels, Surface temperatures, Thermal barrier coatings, Thermal insulation, X ray diffraction, X ray powder diffraction, Young's Modulus, Yttria stabilized zirconia, Yttrium alloys, Zirconia
Abstract

Thermal barrier coatings (TBCs) are widely adopted to protect mechanical components in gas turbine engines operating at high temperature. Basically, the surface temperature of these components must be low enough to retain material properties within acceptable bounds and to extend component life. From this standpoint, air plasma-sprayed (APS) ceria and yttria co-stabilized zirconia (CYSZ) is particularly promising because it provides enhanced thermal insulation capabilities and resistance to hot corrosion. However, essential mechanical properties, such as hardness and Young's modulus, have been less thoroughly investigated. Knowledge of Young's modulus is of concern because it has a significant effect on strain tolerance and stress level and, hence, on durability. The focus of the present study was to determine the mechanical properties of APS CYSZ coatings. In particular, X-ray diffraction (XRD) is adopted for phase analysis of powders and as-sprayed coatings. In addition, scanning electron microscopy (SEM) and image analysis (IA) are employed to explore coating microstructure and porosity. Finally, the Young's modulus of the coating is determined using nanoindentation and a resonant method. The results obtained are then discussed and a cross-check on their consistency is carried out by resorting to a micromechanical model. © 2010 Blackwell Publishing Ltd.

Notes

cited By 21

URLhttps://www.scopus.com/inward/record.uri?eid=2-s2.0-77956643363&doi=10.1111%2fj.1475-1305.2009.00659.x&partnerID=40&md5=480c2bba2e19e25aae806ade321cab64
DOI10.1111/j.1475-1305.2009.00659.x
Citation KeyAlfano2010409