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

Fatih Kirbiyik; Mustafa Guven Gok; Gultekin Goller

doi:10.1016/j.surfcoat.2017.08.025

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

Department of Metallurgical and Materials Engineering

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

40 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 language	English
Pages (from-to)	193-201
Number of pages	9
Journal	Surface and Coatings Technology
Volume	329
DOIs	https://doi.org/10.1016/j.surfcoat.2017.08.025
Publication status	Published - 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.

Funders	Funder number
Council of Higher Education of Turkey

Keywords

AlO
CYSZ
Functionally graded
Thermal barrier coating
Thermal properties

Access to Document

10.1016/j.surfcoat.2017.08.025

Cite this

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

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.",

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N2 - 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.

AB - 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.

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