A study on the effect of nano-CeO2 dispersion on the characteristics of thermally-grown oxide (TGO) formed on NiCoCrAlY powders and coatings during isothermal oxidation

A. Zakeri; E. Bahmani; A. Sabour Rouh Aghdam; B. Saeedi; Mingwen Bai

doi:10.1016/j.jallcom.2020.155319

A study on the effect of nano-CeO2 dispersion on the characteristics of thermally-grown oxide (TGO) formed on NiCoCrAlY powders and coatings during isothermal oxidation

A. Zakeri, E. Bahmani, A. Sabour Rouh Aghdam, B. Saeedi, Mingwen Bai

Research output: Contribution to journal › Article › peer-review

23 Citations (Scopus)

Abstract

The present investigation is focusing on the high-temperature oxidation behavior of conventional and nano-CeO ₂ modified MCrAlY alloys, in the form of powders and coatings. Emphasis is placed upon the influence of MCrAlY alloy form on the oxidation performance. The NiCoCrAlY- CeO ₂ nanocomposite powders were prepared by mechanical milling and were subsequently thermally sprayed by high velocity oxygen-fuel (HVOF) technique. Isothermal oxidation tests were carried out at 1000 °C for up to 100 h. Scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), and transmission electron microscopy (TEM) experimental analyses with thermodynamic equilibrium calculations were used for analysis of the oxide scales. The results indicated that the effect of nano-CeO ₂ addition on the oxidation properties was more pronounced in the form of coating. Moreover, the oxidation rate of the nano-CeO ₂ modified coating was found to be 87% lower than that of conventional coating, which was suggested to be related to the incorporation of nano-sized CeO ₂ dispersion into the Al ₂O ₃ scale. The different oxidation mechanisms were discussed.

Original language	English
Article number	155319
Pages (from-to)	(In-Press)
Journal	Journal of Alloys and Compounds
Volume	835
Early online date	30 Apr 2020
DOIs	https://doi.org/10.1016/j.jallcom.2020.155319
Publication status	Published - 15 Sept 2020
Externally published	Yes

Keywords

MCrAlY
NiCoCrAlY
Nanocomposite
HVOF
Mechanical milling
High-temperature oxidation

ASJC Scopus subject areas

Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

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10.1016/j.jallcom.2020.155319

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A study on the effect of nano-CeO2 dispersion on the characteristics of thermally-grown oxide (TGO) formed on NiCoCrAlY powders and coatings during isothermal oxidation. / Zakeri, A.; Bahmani, E.; Sabour Rouh Aghdam, A. et al.
In: Journal of Alloys and Compounds, Vol. 835, 155319, 15.09.2020, p. (In-Press).

Research output: Contribution to journal › Article › peer-review

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title = "A study on the effect of nano-CeO2 dispersion on the characteristics of thermally-grown oxide (TGO) formed on NiCoCrAlY powders and coatings during isothermal oxidation",

abstract = "The present investigation is focusing on the high-temperature oxidation behavior of conventional and nano-CeO 2 modified MCrAlY alloys, in the form of powders and coatings. Emphasis is placed upon the influence of MCrAlY alloy form on the oxidation performance. The NiCoCrAlY- CeO 2 nanocomposite powders were prepared by mechanical milling and were subsequently thermally sprayed by high velocity oxygen-fuel (HVOF) technique. Isothermal oxidation tests were carried out at 1000 °C for up to 100 h. Scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), and transmission electron microscopy (TEM) experimental analyses with thermodynamic equilibrium calculations were used for analysis of the oxide scales. The results indicated that the effect of nano-CeO 2 addition on the oxidation properties was more pronounced in the form of coating. Moreover, the oxidation rate of the nano-CeO 2 modified coating was found to be 87% lower than that of conventional coating, which was suggested to be related to the incorporation of nano-sized CeO 2 dispersion into the Al 2O 3 scale. The different oxidation mechanisms were discussed. ",

keywords = "MCrAlY, NiCoCrAlY, Nanocomposite, HVOF, Mechanical milling, High-temperature oxidation",

author = "A. Zakeri and E. Bahmani and {Sabour Rouh Aghdam}, A. and B. Saeedi and Mingwen Bai",

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AU - Zakeri, A.

AU - Bahmani, E.

AU - Sabour Rouh Aghdam, A.

AU - Saeedi, B.

AU - Bai, Mingwen

PY - 2020/9/15

Y1 - 2020/9/15

N2 - The present investigation is focusing on the high-temperature oxidation behavior of conventional and nano-CeO 2 modified MCrAlY alloys, in the form of powders and coatings. Emphasis is placed upon the influence of MCrAlY alloy form on the oxidation performance. The NiCoCrAlY- CeO 2 nanocomposite powders were prepared by mechanical milling and were subsequently thermally sprayed by high velocity oxygen-fuel (HVOF) technique. Isothermal oxidation tests were carried out at 1000 °C for up to 100 h. Scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), and transmission electron microscopy (TEM) experimental analyses with thermodynamic equilibrium calculations were used for analysis of the oxide scales. The results indicated that the effect of nano-CeO 2 addition on the oxidation properties was more pronounced in the form of coating. Moreover, the oxidation rate of the nano-CeO 2 modified coating was found to be 87% lower than that of conventional coating, which was suggested to be related to the incorporation of nano-sized CeO 2 dispersion into the Al 2O 3 scale. The different oxidation mechanisms were discussed.

AB - The present investigation is focusing on the high-temperature oxidation behavior of conventional and nano-CeO 2 modified MCrAlY alloys, in the form of powders and coatings. Emphasis is placed upon the influence of MCrAlY alloy form on the oxidation performance. The NiCoCrAlY- CeO 2 nanocomposite powders were prepared by mechanical milling and were subsequently thermally sprayed by high velocity oxygen-fuel (HVOF) technique. Isothermal oxidation tests were carried out at 1000 °C for up to 100 h. Scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), and transmission electron microscopy (TEM) experimental analyses with thermodynamic equilibrium calculations were used for analysis of the oxide scales. The results indicated that the effect of nano-CeO 2 addition on the oxidation properties was more pronounced in the form of coating. Moreover, the oxidation rate of the nano-CeO 2 modified coating was found to be 87% lower than that of conventional coating, which was suggested to be related to the incorporation of nano-sized CeO 2 dispersion into the Al 2O 3 scale. The different oxidation mechanisms were discussed.

KW - MCrAlY

KW - NiCoCrAlY

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KW - HVOF

KW - Mechanical milling

KW - High-temperature oxidation

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A study on the effect of nano-CeO2 dispersion on the characteristics of thermally-grown oxide (TGO) formed on NiCoCrAlY powders and coatings during isothermal oxidation

Abstract

Keywords

ASJC Scopus subject areas

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