The influence of high-temperature sintering on microstructure and mechanical properties of free-standing APS CeO2–Y2O3–ZrO2 coatings
The influence of high-temperature sintering on microstructure and mechanical properties of free-standing APS CeO2–Y2O3–ZrO2 coatings
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%
The influence of high-temperature sintering on microstructure and mechanical properties of free-standing APS CeO2–Y2O3–ZrO2 coatings
2662-2669
Alfano, M.
c0767bcc-f35e-4ade-b441-7973971b0e3b
Di Girolamo, G.
1f36f48d-4b5b-4388-86d7-96c02c37f82c
Pagnotta, L.
bf5438d9-ee0b-402f-a826-660477fb77e7
Sun, D.
ccee3ca1-d1bb-46a7-b0a9-438700125b89
Zekonyte, J.
4a1b52a8-fa37-45d8-88d8-593df2efe662
Wood, R.J.K.
d9523d31-41a8-459a-8831-70e29ffe8a73
May 2010
Alfano, M.
c0767bcc-f35e-4ade-b441-7973971b0e3b
Di Girolamo, G.
1f36f48d-4b5b-4388-86d7-96c02c37f82c
Pagnotta, L.
bf5438d9-ee0b-402f-a826-660477fb77e7
Sun, D.
ccee3ca1-d1bb-46a7-b0a9-438700125b89
Zekonyte, J.
4a1b52a8-fa37-45d8-88d8-593df2efe662
Wood, R.J.K.
d9523d31-41a8-459a-8831-70e29ffe8a73
Alfano, M., Di Girolamo, G., Pagnotta, L., Sun, D., Zekonyte, J. and Wood, R.J.K.
(2010)
The influence of high-temperature sintering on microstructure and mechanical properties of free-standing APS CeO2–Y2O3–ZrO2 coatings.
Journal of Materials Science, 45 (10), .
(doi:10.1007/s10853-010-4245-6).
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%
This record has no associated files available for download.
More information
Published date: May 2010
Keywords:
The influence of high-temperature sintering on microstructure and mechanical properties of free-standing APS CeO2–Y2O3–ZrO2 coatings
Identifiers
Local EPrints ID: 79485
URI: http://eprints.soton.ac.uk/id/eprint/79485
ISSN: 0022-2461
PURE UUID: 97654fb5-54ef-4e7b-a4f2-7faea8375bf1
Catalogue record
Date deposited: 16 Mar 2010
Last modified: 14 Mar 2024 02:37
Export record
Altmetrics
Contributors
Author:
M. Alfano
Author:
G. Di Girolamo
Author:
L. Pagnotta
Author:
D. Sun
Author:
J. Zekonyte
Download statistics
Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.
View more statistics