Microstructural, mechanical and thermal properties of Al2O3/CYSZ functionally graded thermal barrier coatings

Fatih Kirbiyik, Mustafa Guven Gok, Gultekin Goller*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

31 Citations (Scopus)

Abstract

In this study, CYSZ/Al2O3 ceramic TBCs were produced in double layered and FGed design having 4, 8 and 12 layers by high-velocity oxy-fuel and atmospheric plasma spraying processes. Microstructural, mechanical and thermal properties of the TBCs were evaluated. The thickness of metallic bonding layer and ceramic top coat were measured as 100 ± 30 μm and 250 ± 80 μm, respectively. Thermal conductivity value of the coating having 8 layered CYSZ/Al2O3 functionally graded design (0.82 W/m·K) were lowest compared to CYSZ/Al2O3 double layered (1.32 W/m·K) and CYSZ single layered (1.44 W/m·K) designs at 835 °C. Thermal cycle performance and bonding strength of the CYSZ/Al2O3 FGed TBCs were superior to those of single layered CYSZ and double layered CYSZ/Al2O3 coatings. Phase transformation from γ-Al2O3 to α-Al2O3 was observed after the thermal cycle test.

Original languageEnglish
Pages (from-to)193-201
Number of pages9
JournalSurface and Coatings Technology
Volume329
DOIs
Publication statusPublished - 25 Nov 2017

Bibliographical note

Publisher Copyright:
© 2017 Elsevier B.V.

Funding

This work was supported by the Academic Staff Training Program (OYP) of the Council of Higher Education of Turkey . The authors thank Prof. Dr. Yılmaz Taptik and Hasan Huseyin Sezer for their contributions on thermal spray and characterization process.

FundersFunder number
Council of Higher Education of Turkey

    Keywords

    • AlO
    • CYSZ
    • Functionally graded
    • Thermal barrier coating
    • Thermal properties

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