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Cracking behavior of Gd2Zr2O7/YSZ multi-layered thermal barrier coatings deposited by suspension plasma spray
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Amer, Mohamed, Curry, Nicholas, Hayat, Qamar, Sharma, Rohit, Janik, Vit, Zhang, Xiang, Nottingham, Jon and Bai, Mingwen (2023) Cracking behavior of Gd2Zr2O7/YSZ multi-layered thermal barrier coatings deposited by suspension plasma spray. Coatings, 13 (1). 107. doi:10.3390/coatings13010107 ISSN 2079-6412.
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Official URL: https://doi.org/10.3390/coatings13010107
Abstract
A new multi-layered thermal barrier coating system (TBCs) containing gadolinium zirconate (GZ, Gd2Zr2O7) and yttria-stabilized zirconia (YSZ) was developed using suspension plasma spray (SPS) to improve the overall thermal cycling performance. This study focuses on the cracking behavior of the GZ/YSZ TBC after thermal exposure to find out the key factors that limit its lifetime. Different cracking behaviors were detected depending on the thermal treatment condition (i.e., horizontal cracks within the ceramic layer and at the thermally grown oxide (TGO)/YSZ interface) which can be related to stresses developed through thermal expansion mismatch and increased TGO thickness beyond a critical value, respectively. A reduction in hardness of bond coat (BC) was measured by nanoindentation and linked with the thermally activated grain growth mechanism. The hardness and elastic modulus of ceramic layers (GZ and YSZ) showed an increased trend after treatment that contributed to the interfacial cracks.
Item Type: | Journal Article | ||||||
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Subjects: | Q Science > QD Chemistry T Technology > TA Engineering (General). Civil engineering (General) T Technology > TP Chemical technology T Technology > TS Manufactures |
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Divisions: | Faculty of Science, Engineering and Medicine > Engineering > WMG (Formerly the Warwick Manufacturing Group) | ||||||
Library of Congress Subject Headings (LCSH): | Thermal barrier coatings , Gadolinium zirconate , Plasma spraying , Microstructure , Cracking process | ||||||
Journal or Publication Title: | Coatings | ||||||
Publisher: | MDPI | ||||||
ISSN: | 2079-6412 | ||||||
Official Date: | 6 January 2023 | ||||||
Dates: |
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Volume: | 13 | ||||||
Number: | 1 | ||||||
Article Number: | 107 | ||||||
DOI: | 10.3390/coatings13010107 | ||||||
Status: | Peer Reviewed | ||||||
Publication Status: | Published | ||||||
Access rights to Published version: | Open Access (Creative Commons) | ||||||
Date of first compliant deposit: | 11 January 2023 | ||||||
Date of first compliant Open Access: | 11 January 2023 |
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