On the early stage isothermal oxidation of APS CoNiCrAlY coatings
On the early stage isothermal oxidation of APS CoNiCrAlY coatings
The aim of this study is to analyze the evolution of microstructural and room temperature mechanical properties of air plasma sprayed (APS) CoNiCrAlY coatings before and after early stage high-temperature oxidation. To this purpose, selected samples were isothermally heat treated at 1110 °C for different durations. Phase analysis and oxide scale characterization were performed using x-ray diffraction. Morphological and microstructural features of as-sprayed and oxidized CoNiCrAlY coatings were analyzed by scanning electron microscopy and energy dispersive x-ray spectroscopy. After heat treatment, a duplex oxide scale, composed of an inner ?-Al2O3 layer and an outer spinel-type oxide layer, was observed on coating top-surface. The nanoindentation technique was employed to study the evolution of the mechanical properties. An increase in Young’s modulus and hardness with increasing the aging time was observed, this effect was mainly addressed to the partial densification of coating microstructure.
coatings, heat resistant metals, thermal spray
1989-1997
Di Girolamo, G.
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Alfano, M.
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Pagnotta, L.
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Taurino, A.
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Zekonyte, J.
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Wood, R.J.K.
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September 2012
Di Girolamo, G.
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Alfano, M.
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Pagnotta, L.
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Taurino, A.
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Zekonyte, J.
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Wood, R.J.K.
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Di Girolamo, G., Alfano, M., Pagnotta, L., Taurino, A., Zekonyte, J. and Wood, R.J.K.
(2012)
On the early stage isothermal oxidation of APS CoNiCrAlY coatings.
Journal of Materials Engineering and Performance, 21 (9), .
(doi:10.1007/s11665-011-0115-x).
Abstract
The aim of this study is to analyze the evolution of microstructural and room temperature mechanical properties of air plasma sprayed (APS) CoNiCrAlY coatings before and after early stage high-temperature oxidation. To this purpose, selected samples were isothermally heat treated at 1110 °C for different durations. Phase analysis and oxide scale characterization were performed using x-ray diffraction. Morphological and microstructural features of as-sprayed and oxidized CoNiCrAlY coatings were analyzed by scanning electron microscopy and energy dispersive x-ray spectroscopy. After heat treatment, a duplex oxide scale, composed of an inner ?-Al2O3 layer and an outer spinel-type oxide layer, was observed on coating top-surface. The nanoindentation technique was employed to study the evolution of the mechanical properties. An increase in Young’s modulus and hardness with increasing the aging time was observed, this effect was mainly addressed to the partial densification of coating microstructure.
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10.1007_s11665-011-0115-x[1].pdf
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Published date: September 2012
Keywords:
coatings, heat resistant metals, thermal spray
Organisations:
nCATS Group
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Local EPrints ID: 352171
URI: http://eprints.soton.ac.uk/id/eprint/352171
ISSN: 1059-9495
PURE UUID: 977301e7-6a6a-4f48-a1c0-b8dca652670d
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Date deposited: 07 May 2013 13:45
Last modified: 15 Mar 2024 02:47
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Author:
G. Di Girolamo
Author:
M. Alfano
Author:
L. Pagnotta
Author:
A. Taurino
Author:
J. Zekonyte
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