Evaluation of TGO growth in thermal barrier coatings using impedance spectroscopy

Huang, Hui; Liu, Chao; Ni, Liyong; Zhou, Chungen

doi:10.1007/s12598-011-0363-z

Cited by 21 publications

(6 citation statements)

References 13 publications

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“…[1,3,4], which makes the performance of TBCs unsatisfactory. As a result, the wide application of TBCs has been entitled to advanced nondestructive test (NDT) techniques for evaluation and failure detection during service [5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Nondestructive Interface Morphology Characterization of Thermal Barrier Coatings Using Terahertz Time-Domain Spectroscopy

Wang

Huang

et al. 2019

Coatings

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In this work, a terahertz time-domain spectroscopy (THz-TDS) system was used to measure the thickness of thermal barrier coatings (TBCs) and characterize the interface morphology of TBCs after erosion. Reflection mode, with an angle of incidence of 0, was used for inspection before and after erosion. The refractive index, thickness, and internal structure evolution tendency of the yttria-stabilized zirconia (YSZ) top coat were estimated under consideration of the interaction between the pulsed THz waves and the TBCs. The surface roughness of the top coat surface was considered for the errors analysis in the refractive index and thickness measurement. To reduce the errors introduced by the refractive index change after erosion, two mathematical models were built to assess the thickness loss. Then, the thickness loss was compared with results estimated by the micrometer inspection method. Finally, the basic erosion sample profile with Ra roughness was obtained, and the broadening of THz pulses were suggested as a possible measure for the top coat porosity change, showing that THz waves can be a novel online non-destructive and non-contact evaluation method that can be widely utilized to evaluate the integrity of TBCs applied to gas turbine blades.

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Section: Introductionmentioning

confidence: 99%

Nondestructive Interface Morphology Characterization of Thermal Barrier Coatings Using Terahertz Time-Domain Spectroscopy

Wang

Huang

et al. 2019

Coatings

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“…Since TGO growth rates related to the square root of time [23], the thickness of TGO in the cycle 60, is determined by the equation. 3:…”

Section: Calculating Coating Parametersmentioning

confidence: 99%

THERMAL SHOCK BEHAVIOR OF MIXED COMPOSITE TOP COAT APS TBCs

Ashofteh¹

2018

Ceramics - Silikaty

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Performance of thermal barrier coatings (TBCs) with mixed composite top coat (MCC) were investigated in thermal shockconditions. To produce MCCs, firstly, the powders are mixed with the specified weight ratio, and then the prepared mixture is fed to the plasma stream of the atmospheric plasma spray (APS) machine. Ceria-yttria stabilized zirconia (CSZ) and microand nano-structured yttria stabilized zirconia (YSZ and YSZ-N)

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“…When the coating undergoes multiple thermal cycles, thermal mismatch stress (σ t ) will be induced due to the different thermo-mechanical properties between the layers [26]. Many research results have indicated that TGO growth at high temperatures is one of the critical causes affecting the coating failure [27,28]. Ceramic sintering at high temperatures is another key factor for coating degradation and delamination [29,30].…”

Section: Introductionmentioning

confidence: 99%

Progress in ceramic materials and structure design toward advanced thermal barrier coatings

et al. 2022

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Thermal barrier coatings (TBCs) can effectively protect the alloy substrate of hot components in aeroengines or land-based gas turbines by the thermal insulation and corrosion/erosion resistance of the ceramic top coat. However, the continuous pursuit of a higher operating temperature leads to degradation, delamination, and premature failure of the top coat. Both new ceramic materials and new coating structures must be developed to meet the demand for future advanced TBC systems. In this paper, the latest progress of some new ceramic materials is first reviewed. Then, a comprehensive spalling mechanism of the ceramic top coat is summarized to understand the dependence of lifetime on various factors such as oxidation scale growth, ceramic sintering, erosion, and calcium-magnesium-aluminium-silicate (CMAS) molten salt corrosion. Finally, new structural design methods for high-performance TBCs are discussed from the perspectives of lamellar, columnar, and nanostructure inclusions. The latest developments of ceramic top coat will be presented in terms of material selection, structural design, and failure mechanism, and the comprehensive guidance will be provided for the development of next-generation advanced TBCs with higher temperature resistance, better thermal insulation, and longer lifetime.

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Evaluation of TGO growth in thermal barrier coatings using impedance spectroscopy

Cited by 21 publications

References 13 publications

Nondestructive Interface Morphology Characterization of Thermal Barrier Coatings Using Terahertz Time-Domain Spectroscopy

Nondestructive Interface Morphology Characterization of Thermal Barrier Coatings Using Terahertz Time-Domain Spectroscopy

THERMAL SHOCK BEHAVIOR OF MIXED COMPOSITE TOP COAT APS TBCs

Progress in ceramic materials and structure design toward advanced thermal barrier coatings

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