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Effects of Al2O3 diffusion barrier layer (including Y-containing small oxide precipitates) and nanostructured YSZ top coat on the oxidation behavior of HVOF NiCoCrAlTaY/APS YSZ coatings at 1100 °C

Daroonparvar, Mohammadreza and Mat Yajid, Muhamad Azizi and M. Kay, Charls and Bakhsheshi-Rad, Hamidreza and Gupta, Rajeev Kumar and Mohd. Yusof, Noordin and Ghandvar, Hamidreza and Arshad, Azrina and Mohd. Zulkifli, Intan Syaqirah (2018) Effects of Al2O3 diffusion barrier layer (including Y-containing small oxide precipitates) and nanostructured YSZ top coat on the oxidation behavior of HVOF NiCoCrAlTaY/APS YSZ coatings at 1100 °C. Corrosion Science, 144 . pp. 13-34. ISSN 0010-938X

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Official URL: http://dx.doi.org/10.1016/j.corsci.2018.07.013

Abstract

In this research, the effects of thin Al2O3 diffusion barrier layer (including Y-containing small oxide precipitates) and nanostructured YSZ top coat on the high temperature oxidation behavior of HVOF NiCoCrAlTaY/APS YSZ coatings were examined by using isothermal oxidation tests at 1100 °C. Nanostructured YSZ top coat could slightly reduce the double layered TGO growth rate and weight gain of thermal barrier coating systems. However, Al2O3 diffusion barrier layer (consisting of Y-containing small oxide precipitates) could substantially decline the oxidation rate and Ta movement (Ta-enriched oxides formation) in the NiCoCrAlTaY/Al2O3/nanostructured YSZ coating at 1100 °C.

Item Type:Article
Uncontrolled Keywords:NiCoCrAlTaY coating, TGO growth rate, Al2O3 layer, oxidation resistance
Subjects:T Technology > TJ Mechanical engineering and machinery
Divisions:Mechanical Engineering
ID Code:84428
Deposited By: Yanti Mohd Shah
Deposited On:11 Jan 2020 15:08
Last Modified:11 Jan 2020 15:08

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