Evaluation of mixed oxide formation and sintering behavior in thermal barrier coatings on nickel-based superalloy

A. S. Parlakyigit*, T. Gulmez, A. C. Karaoglanli

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


Thermal barrier coatings are widely used in aircraft turbines to protect nickel-based superalloys from the effect of high temperature oxidation and hot corrosion. In this study, both NiCrAlY bond coat and yttria-stabilized zirconia top coat were deposited using atmospheric plasma spray technique. After coating production, specimens were exposed to oxidation in air atmosphere at 900 °C, 1000 °C and 1100 °C for different periods of time up to 50 h. Microstructural transformations in the ceramic top coat and growth behavior of the thermally grown oxide layer were examined using scanning electron microscopy, porosity calculation, elemental mapping and hardness measurement. Formation of different types of oxides in the thermally grown oxide layer shows that this process strongly depends on deposition technique as well as on oxidation time and temperature. Hardness values of the top coat increased with a decrease in the porosity of the top coat. Uniformity and homogeneity of the thermally grown oxide layer and densification of the top coat were evaluated in terms of the structural durability of thermal barrier coating systems.

Original languageEnglish
Pages (from-to)822-833
Number of pages12
JournalMaterialwissenschaft und Werkstofftechnik
Issue number6
Publication statusPublished - Jun 2018

Bibliographical note

Publisher Copyright:
© 2018 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim


The authors gratefully thank the Thermal Spray Research and Application Center of Sakarya University for coating production processes and characterization tests. This study was financially supported by Istanbul Technical University (Grant Number: BAP.201235043).

FundersFunder number
Sakarya Üniversitesi
Istanbul Teknik ÜniversitesiBAP.201235043


    • atmospheric plasma spray
    • Inconel 718
    • NiCrAlY
    • oxidation
    • sintering
    • Thermal barrier coating
    • thermally grown oxide


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