Effects of residual stress on the mechanical properties of plasma-sprayed thermal barrier coatings

Zhang, Xiancheng; Watanabe, Makoto; Katayama, Seiji

doi:10.1016/j.engfracmech.2013.08.016

Cited by 44 publications

(17 citation statements)

References 35 publications

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“…Residual stresses are readily generated by inhomogeneous heat treatment or local plastic deformation involving bulk solids, 1-3 thin films, 4-6 and coatings [7][8][9] used in various industrial components. The existing residual stress field in these components has a significant effect on their performance such as mechanical properties, 10 fatigue strength, 11 wear and fracture properties, 12,13 etc.…”

Section: Introductionmentioning

confidence: 99%

Measurement of Residual Stresses Using Nanoindentation Method

Zhu

Xu²,

Wang

et al. 2014

Critical Reviews in Solid State and Materials Sciences

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Instrumented indentation, which is also known as nanoindentation or depth-sensing indentation, is increasingly being used to probe the residual stresses of materials including bulk solids, thin films, and coatings. The residual stresses are proved to have significant effects on various nanoindentation parameters such as hardness, loading curve, unloading curve, pile-up amount around indentation, and true contact area. By analyzing these parameters, numerous methods are developed to evaluate the residual stresses of materials in recent years. This article reviews six commonly used models which determine residual stresses from analyzing load-depth curves, as well as indentation fracture technique which is based on the classical fracture mechanics. Emphasis is placed on the principle, application and limitation of each nanoindentation method.

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Section: Introductionmentioning

confidence: 99%

Measurement of Residual Stresses Using Nanoindentation Method

Zhu

Xu²,

Wang

et al. 2014

Critical Reviews in Solid State and Materials Sciences

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show abstract

“…Many methods have been developed to measure the deformation, mainly including contact measurement and non-contact measurement method. In the contact measurement method, the deformation at specific point is measured by the highprecision contact displacement sensors, such as extensometers, linear variable differential transformer and so on [46,47]. In the non-contact measurement method, the deformation of the substrate is measured by a non-contact displacement measuring device, such as laser displacement sensor, optical microscope, CCD camera, and so on [48,49].…”

Section: Curvature Measurement Methodsmentioning

confidence: 99%

Stress among the APS-Prepared TBCs: Testing and Analysis

Qu¹,

He²,

Fang³

2020

Methods for Film Synthesis and Coating Procedures

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Stress state in thermal barrier coatings (TBCs) has an influence on the service property and safety of coatings. The stress in TBCs should be characterized and measured. This is helpful for the guidance of design and preparation, the study of failure mechanism and the promotion of application of TBCs. This chapter reviewed the research progress on the stress measurement for air plasma spray (APS)-prepared TBCs. The origin and category of stress during preparation process and service were discussed. Then, the measurement technology and characterization method for stress in APS-prepared TBCs were focused. The common stress measurement techniques such as X-ray diffraction, neutron diffraction, Raman spectroscopy, photoluminescence piezospectroscopy, curvature measurement, material removal and indentation method were detailed. Furthermore, some suggestions were presented for the future work by summarizing the shortcomings of the exiting research. Methods for Film Synthesis and Coating Procedures2 'partially stabilized' with about 6-8 wt.% yttria (7YSZ), which has the good heatinsulating property and long thermal cycle life. TGO, whose composition is α-Al 2 O 3 , is formed by the reaction between aluminum diffusing from the bond coat and exterior oxygen. TGO can provide good bonding of TBC to bond coat. The bond coat contains the source of elements to create TGO in oxidizing environment and provides oxidation protection, primarily of NiCoCrAlY-or NiAlPt-based compositions. The superalloy substrate, which has high strength at high temperatures, can experience complicated mechanical loads during service [1,2,4].Recently, many methods have been developed to prepare the ceramic top coat, such as air plasma spray (APS) and electron beam physical vapor deposition (EB-PVD) process [5,6]. In APS process, the ceramic feedstock are injected into the high temperature plasma plume, heated to the molten or high-plasticity condition, impinge onto the surface of specimen with a certain momentum, and rapidly solidify. Then the lamellar microstructures, which consist of a large number of overlapped splats, are formed, as shown in Figure 2(a). In EB-PVD process, ingots of a ceramic composition are vaporized in a vacuum chamber using a focused electron beam. The ceramic vapor gradually deposit on the specimen and form columnar microstructure, which are perpendicular to the surface of specimen, as shown in Figure 2(b).TBCs prepared by APS process, which has lower cost, has been widely used in the larger stationary components. However, the failure behavior such as premature spallation of TBCs during preparation and operation process is still an overriding concern. The premature spallation of TBCs may expose the superalloy substrate to hot gases, resulting in the oxidization of superalloy. This may influence the service performance, lifetime and safety of aircraft, even lead to catastrophic damage [7]. The premature spallation of TBCs mainly results from intralayer and interlayer fractures [8]. The fracture behavior of materials is closely...

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“…The substrate preheating temperature also affects the residual stress in the coating. A higher preheating temperature and deposition temperature, coating deposited at high temperature result in formation of higher compressive residual stress [110]. The increase in compressive residual stress results in increase in fracture toughness of the coating.…”

Section: Residual Stress In Thermal Barrier Coatingmentioning

confidence: 99%

Thermal Barrier Coatings—A State of the Art Review

et al. 2020

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Thermal barrier coatings (TBCs) have seen considerable advancement since the initial testing and development of thermal spray coating. Thermal barrier coatings are currently been utilized in various engineering areas which include internal combustion engines, gas turbine blades of jet engines, pyrochemical reprocessing units and many more. The development of new materials, deposition techniques is targeted at improving the life of the underlying substrate. Hence, the performance of the coating plays a vital role in improving the life of substrate. The scope for advancement in thermal barrier coatings is very high and continuous efforts are being made to produce improved and durable coatings. Thermal barrier coatings have the potential to address long term and short-term problems in gas turbine, internal combustion and power generation industry. The study of thermal barrier coating material, performance and life estimation is a critical factor that should be understood to introduce any advancement. The present review gives an overview of the thermal spraying techniques and current advancements in materials, mechanical properties, understanding the high temperature performance, residual stress in the coating, understanding the failure mechanisms and life prediction models for coatings.

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Effects of residual stress on the mechanical properties of plasma-sprayed thermal barrier coatings

Cited by 44 publications

References 35 publications

Measurement of Residual Stresses Using Nanoindentation Method

Measurement of Residual Stresses Using Nanoindentation Method

Stress among the APS-Prepared TBCs: Testing and Analysis

Thermal Barrier Coatings—A State of the Art Review

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