Investigation of vermiculite infiltration effect on microstructural properties of thermal barrier coatings (TBCs) produced by electron beam physical vapor deposition method (EB-PVD)

Odabas, Okan; Ozgurluk, Yasin; Özkan, Derviş; Binal, Gülfem; Çalış, İbrahim; Karaoğlanlı, Abdullah Cahit

doi:10.1016/j.surfcoat.2022.128645

Cited by 42 publications

(7 citation statements)

References 23 publications

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“…For example, in terms of materials, thermal barrier coatings (TBC) are widely used to extend the lifespan of components. Experts [ 21 , 22 ] have found that in high temperature environments of 718 °C, high temperatures lead to an increase in the oxidation cycle of this material layer, affecting the components’ lifespan. However, considering that it is difficult to control the temperature in the experiment, and according to the literature [ 18 ], it can also be concluded that temperature has less influence on the erosion and wear of the servo valve compared with other factors, in this study, temperature was not taken into account as one of the experimental working conditions.…”

Section: Experimental Design and Data Analysis Of Performance Degrada...mentioning

confidence: 99%

Direct-Drive Electro-Hydraulic Servo Valve Performance Characteristics Prediction Based on Big Data and Neural Networks

Huang

2023

Sensors

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Direct-drive electro-hydraulic servo valves play a key role in aerospace control systems, and their operational stability and safety reliability are crucial to the safety, stability, and efficiency of the entire control system. Based on the prediction of the performance change of the servo valve and the resulting judgement and prediction of its life, this can effectively avoid serious accidents and economic losses caused by failure due to performance degradation in the work. On the basis of existing research, factors such as opening, oil contamination, and pressure difference are used as prerequisites for the operation of direct-drive electro-hydraulic servo valves. In addition to the current research on pressure gain and leakage, the performance parameters of servo valves, such as overlap, threshold, and symmetry, are also expanded and selected as research objects, combined with pressure design servo valve performance degradation experiments for testing instruments such as flow and position sensors, and data are obtained on changes in various performance parameters. The experimental data are analyzed and a prediction model is built to predict the performance parameters of the servo valve by combining the existing popular neural networks, and the prediction error is calculated to verify the accuracy and validity of the model. The experimental results indicate that as the working time progresses, the degree of erosion and wear on the valve core and valve sleeve of the servo valve increases. Overall, it has been observed that the performance parameters of the servo valve show a slow trend of change under different working conditions, and the rate of change is generally higher under high pollution (level 9) conditions than under other conditions. The prediction results indicate that the predicted values of various performance parameters of the servo valve by the prediction model are lower than 0.2% compared to the experimental test set data. By comparing the two dimensions of the accuracy and prediction trend, this model meets industrial needs and outperforms deep learning algorithm models such as the exponential smoothing algorithm and ARIMA model. The experiments and results of this study provide theoretical support for the life prediction model of servo valves based on neural networks and machine learning in artificial intelligence, and provide a reference for the development of direct-drive electro-hydraulic servo valves in aerospace and other industrial fields for use and failure standards.

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Section: Experimental Design and Data Analysis Of Performance Degrada...mentioning

confidence: 99%

Direct-Drive Electro-Hydraulic Servo Valve Performance Characteristics Prediction Based on Big Data and Neural Networks

Huang

2023

Sensors

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“…Thermal barrier coatings (TBCs) are functional coatings used to protect high-temperature components and extend their service life, which have been used for many years on the surfaces of advanced gas turbines, aero-engine blades and other related components 1 , 2 . TBCs layers generally consist of a ceramic top coat (TC) and metal bond coat (BC).…”

Section: Introductionmentioning

confidence: 99%

Research on crack propagation behaviour of EB-PVD TBCs based on TGO evolution

Wang,

Zhan,

Liu

et al. 2023

Sci Rep

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Thermal Barrier Coatings (TBCs) are functional coatings used to protect high-temperature components that are prone to early damage and premature failure under the influence of complex working conditions. This paper examines the crack propagation behaviour of 8% yttria-stabilized zirconia (8YSZ) EB-PVD TBCs under different oxidation conditions at 1100 °C. The morphology of interfacial cracks after oxidation was summarized and the evolution of thermally grown oxide (TGO) was quantified. Based on the evolution of TGO, the causes of crack propagation were analyzed. For the specimens after oxidation experiment, the interfacial crack propagation behaviour was observed and analyzed by SEM, and the reason of lateral crack propagation was explained from the perspective of interfacial fracture toughness. The reason for crack deflection is analyzed from the perspective of energy release rate. The equivalent thickness, normalized rumpling index and two-dimensional roughness index were calculated, then the TGO growth behaviour was comprehensively analyzed and related to the crack propagation.

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“…Thermal corrosion under high‐temperature environment and molten salt corrosion such as CaO–MgO–Al 2 O 3 –SiO 2 (CMAS) are the external factors for the failure of TBCs systems. Ozgurluk 30–40 et al. studied the influence of thermal corrosion effect and CMAS effect at high temperature (1000°C) and analyzed the failure mechanism of TBCs system.…”

Section: Introductionmentioning

confidence: 99%

“…Thermal corrosion under high-temperature environment and molten salt corrosion such as CaO-MgO-Al 2 O 3 -SiO 2 (CMAS) are the external factors for the failure of TBCs systems. Ozgurluk [30][31][32][33][34][35][36][37][38][39][40] et al studied the influence of thermal corrosion effect and CMAS effect at high temperature (1000 • C) and analyzed the failure mechanism of TBCs system. The results show that the molten salt in the air (such as molten vermiculite) interacts with YSZ to generate thermomechanical CMAS damage on the coating surface, the molten salt causes the phase transition of ZrO 2 in the coating, and the volume of ZrO 2 changes during the cooling process, all these lead to the failure of the TBCs system.…”

Section: Introductionmentioning

confidence: 99%

Finite element analysis of TGO thickness on stress distribution and evolution of 8YSZ thermal barrier coatings

Zheng

Lin

et al. 2022

J Am Ceram Soc.

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According to the experimental research results of the thermally grown oxide (TGO) layered growth during the pre‐oxidation process of 8 wt.% yttria‐stabilized zirconia thermal barrier coating (TBC), a two‐dimensional sinusoidal TC/bonding coat (BC) curve interface model of the longitudinal section of TBCs based on finite element simulation was constructed; the thickness and composition of the TGO layer relative to the TC/BC curve interfacial stress distribution and its evolution during the thermal cycling process were studied. The results show that when the TGO layer uses α‐Al2O3 as the main oxide (black TGO), the thicker the black TGO layer, the more uniform the stress distribution of the TC/BC interface. When the TGO layer is dominated by spinel‐structured Co and Cr oxides (gray TGO), the stress “band” of the TC/BC interface is destroyed; it shows the alternating phenomenon of tensile stress zone and compressive stress zone, and after the rapid random growth of TGO, the concentrated tensile stress increased by a large jump. Affected by the thickness of the prefabricated black TGO layer, there is a limit peak in the thickness of the black TGO layer, the normal stress at the TC/BC boundary is minimized, and the magnitude of the stress change is also minimized.

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Investigation of vermiculite infiltration effect on microstructural properties of thermal barrier coatings (TBCs) produced by electron beam physical vapor deposition method (EB-PVD)

Cited by 42 publications

References 23 publications

Direct-Drive Electro-Hydraulic Servo Valve Performance Characteristics Prediction Based on Big Data and Neural Networks

Direct-Drive Electro-Hydraulic Servo Valve Performance Characteristics Prediction Based on Big Data and Neural Networks

Research on crack propagation behaviour of EB-PVD TBCs based on TGO evolution

Finite element analysis of TGO thickness on stress distribution and evolution of 8YSZ thermal barrier coatings

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