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

The influence of high-temperature sintering on microstructure and mechanical properties of free-standing APS CeO2-Y2O 3-ZrO2 coatings

TitleThe influence of high-temperature sintering on microstructure and mechanical properties of free-standing APS CeO2-Y2O 3-ZrO2 coatings
Publication TypeArticolo su Rivista peer-reviewed
Year of Publication2010
AuthorsAlfano, M., Di Girolamo G., Pagnotta L., Sun D., Zekonyte J., and Wood R.J.K.
JournalJournal of Materials Science
Volume45
Pagination2662-2669
ISSN00222461
KeywordsAir plasma spray, Annealing time, Before and after, Cerium compounds, Coating microstructures, Depth-sensing nanoindentation, Elastic moduli, Elasticity, hardness, High-temperature sintering, Image analysis, Isothermally annealed, Mechanical properties, Microstructural modification, Microstructure, Microstructure and mechanical properties, Nanoindentation, NO phase, Phase shifters, Phase stability, Plasma spraying, Protective coatings, Scanning electron microscopy, Sintering, Stabilized zirconia, Thermal aging, Vickers microindentation, X ray diffraction, X ray diffraction analysis, Young's Modulus, Yttria stabilized zirconia, Zirconia
Abstract

In this study, ceria-yttria co-stabilized zirconia (CYSZ) free-standing coatings, deposited by air plasma spraying (APS), were isothermally annealed at 1315 °C in order to explore the effect of sintering on the microstructure and the mechanical properties (i.e., hardness and Young's modulus). To this aim, coating microstructure, before and after heat treatment, was analyzed using scanning electron microscopy, and image analysis was carried out in order to estimate porosity fraction. Moreover, Vickers microindentation and depth-sensing nanoindentation tests were performed in order to study the evolution of hardness and Young's modulus as a function of annealing time. The results showed that thermal aging of CYSZ coatings leads to noticeable microstructural modifications. Indeed, the healing of finer pores, interlamellar, and intralamellar microcracks was observed. In particular, the porosity fraction decreased from 10 to 5% after 50 h at 1315 °C. However, the X-ray diffraction analyses revealed that high phase stability was achieved, as no phase decomposition occurred after thermal aging. In turn, both the hardness and Young's modulus increased, in particular, the increase in stiffness (with respect to "as produced" samples) was equal to 25%, whereas the hardness increased to up to 60%. © 2010 Springer Science+Business Media, LLC.

Notes

cited By 14

URLhttps://www.scopus.com/inward/record.uri?eid=2-s2.0-77951665398&doi=10.1007%2fs10853-010-4245-6&partnerID=40&md5=c64dfeff001f4480b467e29a082635fa
DOI10.1007/s10853-010-4245-6
Citation KeyAlfano20102662