Production and characterisation of GZ/CYSZ alternative thermal barrier coatings with multilayered and functionally graded designs

Mustafa Guven Gok, Gultekin Goller*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

64 Citations (Scopus)

Abstract

In this study multilayered and functionally graded Gd2Zr2O7/CYSZ thermal barrier coatings were designed and produced in 2,4,8, and 12 layers utilizing HVOF and APS processes to improve the thermal cycling performance of single layered Gd2Zr2O7. Microstructural, mechanical, and thermal properties of the coatings were investigated. The phase structure of the Gd2Zr2O7 was stable even after the coating and thermal cycling tests made at 1250 °C. The thermal conductivities and bonding strengths were between in 0.64-0.89 W/mK and 8.87-12.10 MPa, respectively. As far as thermal cycling performance of the designs are concerned while big spallation was observed (74%) in the single layered Gd2Zr2O7 coating after 160 cycles a significant improvement had been observed in cases of multilayered coatings and no failure was seen in functionally graded coatings even after 300 cycles. The results indicated that the thermal cycling performance of Gd2Zr2O7 coating was improved thanks to multilayered and especially functionally graded designs.

Original languageEnglish
Pages (from-to)1755-1764
Number of pages10
JournalJournal of the European Ceramic Society
Volume36
Issue number7
DOIs
Publication statusPublished - 1 Jun 2016

Bibliographical note

Publisher Copyright:
© 2016 Elsevier Ltd.

Funding

This work was supported by Scientific Research Project Funds of Istanbul Technical University (Project Number: 38102 ) and the Academic Staff Training Program (OYP) of the Council of Higher Education of Turkey. The authors thank Prof. Dr. Yilmaz Taptik, Assoc. Prof. Dr. Ozgul Keles and Hasan Huseyin Sezer for their contributions on thermal spray and characterisation processes.

FundersFunder number
Council of Higher Education of Turkey
Istanbul Teknik Üniversitesi38102

    Keywords

    • CYSZ
    • Functionally graded
    • GdZrO
    • Multilayer
    • Thermal barrier coating

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