{"title":"Thermal cycling behavior of Srx(Zr0.9Y0.05Yb0.05)O1.95+x thermal barrier coatings by suspension plasma spraying","authors":"Xueying Feng, Yu Bai, Yuanming Gao, Jiong Liu, Fei Zheng, Rongxing Li, Wen Ma","doi":"10.1111/jace.20088","DOIUrl":null,"url":null,"abstract":"<p>The thermal barrier coatings (TBCs) consisting of Sr<sub>x</sub>(Zr<sub>0.9</sub>Y<sub>0.05</sub>Yb<sub>0.05</sub>)O<sub>1.95+x</sub> were prepared using the suspension plasma spraying (SPS) method. Precursor suspensions were prepared via co-precipitation for this purpose. Detailed microstructural, phase composition, and phase content analyses were conducted on these coatings, designated as SZYY-1 (x = 1.0), SZYY-2 (x = 0.9), and SZYY-3 (x = 0.8). Additionally, the coatings underwent a thermal cycling test at 1121°C for 1 h. To assess the morphology of thermally grown oxide (TGO) in a real coating, a finite element model was employed. SPS-SZYY-2 with columnar crystal structure was found to have the highest number of thermal cycling, up to 345 times. The thermophysical high-temperature properties of the coating can be effectively improved through suitable second-phase content. Microstructural and finite element analyses revealed that stress, primarily caused by the continuous growth of the Co<sub>3</sub>O<sub>4</sub>, NiO and Spinel (CNS) layer within TGO, was the predominant factor leading to coating failure. At elevated temperatures, transverse cracks formed at the interface between the bond coating and ceramic top coating due to mismatched thermal expansion and sintering effects, ultimately leading to coating degradation. Therefore, reducing the generation rate of large stresses in the coating, especially shear stresses, can effectively prevent the generation and propagation of transverse cracks and increase the thermal cycling life of TBCs.</p>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"107 12","pages":"8503-8520"},"PeriodicalIF":3.5000,"publicationDate":"2024-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of the American Ceramic Society","FirstCategoryId":"88","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1111/jace.20088","RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MATERIALS SCIENCE, CERAMICS","Score":null,"Total":0}
引用次数: 0
Abstract
The thermal barrier coatings (TBCs) consisting of Srx(Zr0.9Y0.05Yb0.05)O1.95+x were prepared using the suspension plasma spraying (SPS) method. Precursor suspensions were prepared via co-precipitation for this purpose. Detailed microstructural, phase composition, and phase content analyses were conducted on these coatings, designated as SZYY-1 (x = 1.0), SZYY-2 (x = 0.9), and SZYY-3 (x = 0.8). Additionally, the coatings underwent a thermal cycling test at 1121°C for 1 h. To assess the morphology of thermally grown oxide (TGO) in a real coating, a finite element model was employed. SPS-SZYY-2 with columnar crystal structure was found to have the highest number of thermal cycling, up to 345 times. The thermophysical high-temperature properties of the coating can be effectively improved through suitable second-phase content. Microstructural and finite element analyses revealed that stress, primarily caused by the continuous growth of the Co3O4, NiO and Spinel (CNS) layer within TGO, was the predominant factor leading to coating failure. At elevated temperatures, transverse cracks formed at the interface between the bond coating and ceramic top coating due to mismatched thermal expansion and sintering effects, ultimately leading to coating degradation. Therefore, reducing the generation rate of large stresses in the coating, especially shear stresses, can effectively prevent the generation and propagation of transverse cracks and increase the thermal cycling life of TBCs.
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The Journal of the American Ceramic Society contains records of original research that provide insight into or describe the science of ceramic and glass materials and composites based on ceramics and glasses. These papers include reports on discovery, characterization, and analysis of new inorganic, non-metallic materials; synthesis methods; phase relationships; processing approaches; microstructure-property relationships; and functionalities. Of great interest are works that support understanding founded on fundamental principles using experimental, theoretical, or computational methods or combinations of those approaches. All the published papers must be of enduring value and relevant to the science of ceramics and glasses or composites based on those materials.
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