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Journal of Materials Engineering and Performance

Erschienen in:

01.09.2012

On the Early Stage Isothermal Oxidation of APS CoNiCrAlY Coatings

verfasst von: G. Di Girolamo, M. Alfano, L. Pagnotta, A. Taurino, J. Zekonyte, R. J. K. Wood

Erschienen in: Journal of Materials Engineering and Performance | Ausgabe 9/2012

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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 α-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.

Vorheriger Artikel Optimization of Experimental Conditions of the Pulsed Current GTAW Parameters for Mechanical Properties of SDSS UNS S32760 Welds Based on the Taguchi Design Method

Nächster Artikel Effect of MnO2 Addition on Sintering Properties of 18NiO-NiFe2O4 Composite Ceramics: Preliminary Results

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This point can be addressed to diffusion phenomena occurring during the heat treatment.

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Titel: On the Early Stage Isothermal Oxidation of APS CoNiCrAlY Coatings
verfasst von: G. Di Girolamo
M. Alfano
L. Pagnotta
A. Taurino
J. Zekonyte
R. J. K. Wood
Publikationsdatum: 01.09.2012
Verlag: Springer US
Erschienen in: Journal of Materials Engineering and Performance / Ausgabe 9/2012
Print ISSN: 1059-9495
Elektronische ISSN: 1544-1024
DOI: https://doi.org/10.1007/s11665-011-0115-x

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