Effect of cooling rate on phase transformation in 6–8 wt% YSZ APS TBCs

Roncallo, Giacomo; Barbareschi, Emma; Cacciamani, G.; Vacchieri, E.

doi:10.1016/j.surfcoat.2021.127071

Cited by 29 publications

(5 citation statements)

References 18 publications

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“…As shown from the XRD results of different life stages in Figure 8, the phase structure of the two coatings in each life stage is consistent, and they are all single tetra phase. Previous studies have shown that the phase transition from t-ZrO 2 to c-ZrO 2 and m-ZrO 2 exists only when the temperature is 1300 • C and the sintering time is more significant than 150 h, especially the transition from t-ZrO 2 to m-ZrO 2 [24]. In addition, it has been proved that the high-speed cooling rate can inhibit the phase transition of zirconia coatings [25].…”

Section: Lifementioning

confidence: 99%

Damage Grading Evaluation of Thermal Barrier Coatings under CMAS Corrosion

Liu,

Wang

et al. 2023

Coatings

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Thermal barrier coatings (TBCs) material has excellent high-temperature resistance and heat insulation performance, which plays a vital role in improving the working efficiency and running life of the engine. During the flight, the engine will inhale dust particles in the air. These particles are mostly from siliceous debris, which are usually called calcium magnesium aluminum silicate (CMAS). At present, CMAS corrosion has become one of the important problems affecting the service life of thermal barrier coatings. In this study, conventional yttrium oxide stabilized zirconia (YSZ) coatings and ytterbium oxide and yttrium oxide co-stabilized zirconia (YbYSZ) coatings were prepared by atmospheric plasma spraying. The two coatings were examined under thermal cycling-CMAS coupling conditions and divided into six life stages. The failure modes, CMAS permeation behavior, crack characteristics and mechanical properties of the two coatings at different life stages were evaluated systematically. The experimental results show that the YbYSZ coating has a longer life than YSZ coating under the thermal cycling and CMAS coupling condition, which increases by about 83% compared with the conventional YSZ coating. In the whole life stage, the porosity of YbYSZ coating is always higher than that of YSZ coating. The phase transition is not the reason for the failure and spalling of the coatings. The crack length of the two coatings showed an increasing trend, but the crack length of the YSZ coating was higher than that of the YbYSZ coating, and the crack density of the two coatings showed a “saddle shape”, which was more obvious for the YSZ coating. The YbYSZ coating shows better mechanical properties under the thermal cycling-CMAS coupling condition with the evolution of life.

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Section: Lifementioning

confidence: 99%

Damage Grading Evaluation of Thermal Barrier Coatings under CMAS Corrosion

Liu,

Wang

et al. 2023

Coatings

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“…Among the spraying processes, the study of improving the microstructure of thermal barrier coatings has been widely concerned. It is expected that by optimizing the spraying process, the thermal barrier coatings with excellent performance can be prepared, so as to extend the service life of thermal barrier coatings [10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Prediction of Microstructure and Mechanical Properties of Atmospheric Plasma-Sprayed 8YSZ Thermal Barrier Coatings Using Hybrid Machine Learning Approaches

Zhu

Yang

et al. 2023

Coatings

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The preparation of thermal barrier coatings (TBCs) is a complex process involving the integration of physics and chemistry, mainly involving the flight behavior and deposition behavior of molten particles. The service life and performance of the TBCs were determined by various factors, especially the preparation process parameters. In this work, to set up the quantitative characterization model between the preparation process parameters and the performance characteristic parameters, the ceramic powder particle size, spraying power and spraying distance were treated as the model input parameters, the characteristic parameters of microstructure properties represented by the porosity, circularity and Feret’s diameter and the mechanical property represented by the interfacial binding strength and macrohardness were treated as the model output. The typical back propagation (BP) model and extreme learning machine (ELM) model combined with flower pollination algorithm (FPA) optimization algorithm were employed for modeling analysis. To ensure the robustness of the obtained regression prediction model, the k-fold cross-validation method was employed to evaluate and analyze the regression prediction models. The results showed that the regression coefficient R value of the proposed FPA-ELM hybrid machine learning model was more than 0.94, the root-mean-square error (RMSE) was lower than 2 and showed better prediction accuracy and robustness. Finally, this work provided a novel method to optimize the TBCs preparation process, and was expected to improve the efficiency of TBCs preparation and characterization in the future.

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“…This has motivated the search for materials capable of satisfying the requirements of advanced TBCs. 36,[43][44][45] RE 2 SiO 5 and RE 2 Si 2 O 7 have been widely studied as EBCs 2 ; however their phase transition and poor CaO-MgO-AlO 1.5 -SiO 2 (CMAS) corrosion resistance limit their further applications. 40,41,[46][47][48] CMAS particles in the atmosphere originating mainly from volcanoes eruptions and sandstorms, can melt and corrode TBCs and EBCs at high temperatures (≧1200 • C).…”

Section: Introductionmentioning

confidence: 99%

“…Yttria‐stabilized zirconia (6∼8 wt% YSZ) ceramics, currently used as TBCs, suffer from two prominent shortcomings: low working temperatures (≦1200°C) and high thermal conductivities (2.5–3.6 W·m −1 ·K −1 at 25–1000°C). This has motivated the search for materials capable of satisfying the requirements of advanced TBCs 36,43–45 . RE 2 SiO 5 and RE 2 Si 2 O 7 have been widely studied as EBCs 2 ; however their phase transition and poor CaO‐MgO‐AlO 1.5 ‐SiO 2 (CMAS) corrosion resistance limit their further applications 40,41,46–48 .…”

Section: Introductionmentioning

confidence: 99%

Ferroelastic rare‐earth tantalates for multifunctional thermal/environmental barrier coatings: A perspective

Chen,

Wang,

Zhang

et al. 2023

J Am Ceram Soc.

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This perspective outlines the research directions of ferroelastic rare‐earth (RE) tantalates (RETaO4), which have been studied as multifunctional thermal/environmental barrier coatings (T/EBCs) with working temperatures above 1600°C. Ferroelastic RETaO4 ceramics exhibit several distinct features, including the reversible second‐order ferroelastic phase transition, high toughness, low thermal conductivity, low oxygen ion conductivity, and adjustable thermal expansion coefficients. This perspective provides a concise summary of the research progress on tantalate coatings synthesized via air plasma spraying and electron beam physical vapor deposition. The service performance of tantalate coatings is typically evaluated through thermal fatigue and shock measurements. Uncovering the failure mechanisms and understanding influencing factors are key aspects for future studies. In this regard, establishing the synthesis‐structure‐property relationship of RETaO4 coatings is essential. This brief perspective can serve as a guide for future work on RETaO4 coatings and further advancements in their applications across various fields, including aviation engines and gas turbines.This article is protected by copyright. All rights reserved

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Effect of cooling rate on phase transformation in 6–8 wt% YSZ APS TBCs

Cited by 29 publications

References 18 publications

Damage Grading Evaluation of Thermal Barrier Coatings under CMAS Corrosion

Damage Grading Evaluation of Thermal Barrier Coatings under CMAS Corrosion

Prediction of Microstructure and Mechanical Properties of Atmospheric Plasma-Sprayed 8YSZ Thermal Barrier Coatings Using Hybrid Machine Learning Approaches

Ferroelastic rare‐earth tantalates for multifunctional thermal/environmental barrier coatings: A perspective

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