Quantitative detection of thermal barrier coating thickness based on simulated annealing algorithm using pulsed infrared thermography technology

Bu, Chiwu; Tang, Qingju; Liu, Yuanlin; Yu, Fengyun; Chen, Mei; Zhao, Yawei

doi:10.1016/j.applthermaleng.2016.01.143

Cited by 27 publications

(9 citation statements)

References 15 publications

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“…Neither ultrasonic waves nor THz waves are able to transmit throughout the YSZ topcoat because of the large signal attenuation caused by the porous microstructure 20‐24 . In the active thermography method, the temperature difference between the delaminated and nondelaminated areas in TBCs is usually not evident for accurate detection 25‐27 . The signal of TGO thickness detected by the eddy current testing method depends on the microconstituents in TGO, such as Al 2 O 3 , NiO, and Cr 2 O 3 , which complicate the interpretation of the acquired signal for reliable detection.…”

Section: Introductionmentioning

confidence: 99%

“…[20][21][22][23][24] In the active thermography method, the temperature difference between the delaminated and nondelaminated areas in TBCs is usually not evident for accurate detection. [25][26][27] The signal of TGO thickness detected by the eddy current testing method depends on the microconstituents in TGO, such as Al 2 O 3 , NiO, and Cr 2 O 3 , which complicate the interpretation of the acquired signal for reliable detection. The electrochemical impedance can be used to reveal the degradation of TBCs; however, the impedance signal is found to be sensitive to test parameters such as electrode size, voltage amplitude, and environment temperature.…”

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confidence: 99%

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Nondestructive measurements of residual stress in air plasma‐sprayed thermal barrier coatings

et al. 2020

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There is a demand for more efficient and powerful gas turbines, which are characterized by higher operating temperatures, longer lifetimes, and other features. 1-3 This demand has led to great challenges in the development of advanced thermal protection technologies, among which thermal barrier coatings (TBCs) are regarded as one of those most promising to meet the demand. 4-8 Typically, TBCs consist of the following four layers 5,6 : (i) the superalloy substrate, which is the main load-bearing constituent; (ii) the ceramic top coat (TC), which is usually composed of 6-8 wt.% yttria-stabilized zirconia (YSZ) and acts as a temperature insulator; (iii) an aluminum-containing bond coat (BC) between the substrate and the TC, which is usually composed of MCrAlY (where M is Ni and/or Co) and used for alleviating the thermal expansion mismatch stress between the aforementioned two layers; and (iv) a thermally grown oxide (TGO), which forms between TC and BC when they are exposed to high temperature and provides oxidation resistance. Each of these constituent layers presents marked differences in physical, thermal, and mechanical properties, and all contribute to determine performance and durability. Typically, the TBCs are fabricated using either electron-beam physical vapor deposition

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Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

Nondestructive measurements of residual stress in air plasma‐sprayed thermal barrier coatings

et al. 2020

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“…As the external heat transmits into the inside of the object, it produces a thermal contrast gradient during the transient response in areas with subsurface anomalies, which makes it possible to detect subsurface defects. Since the thermal contrast between abnormal and normal regions changes over time, a set of image sequence is recorded and the detected image when the contrast reaches the maximum can be used to identify defects and estimate the corresponding depth underneath the surface [ 8 , 9 ]. Almond et al [ 5 ] applied LPT to metals and composite materials and compared the raw images with PT.…”

Section: Introductionmentioning

confidence: 99%

An Infrared Defect Sizing Method Based on Enhanced Phase Images

Wei

Mao

et al. 2020

Sensors

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Infrared thermography (IRT) is a full-field, contactless technique that has been widely used for nondestructive evaluation of structural materials due to many advantages. One of the major limitations of IRT is the fuzzy edge and low contrast in the inspected images—as well as the cost of the system. An efficient image post-processing with an affordable and portable device is of great interest to the engineering society. In this study, a convenient and economical inspection system using common halogen lamps was constructed. The corresponding image-processing scheme, which includes Fourier phase analysis and specific image enhancement was developed to identify defects with sharp and clear edges and good contrast. This system was applied to localized of defects in glass-fiber-reinforced composite panels. The results showed that defects with an effective diameter as small as 5 mm can be detected with excellent image quality. As a conclusion, the developed system provides an economic alternative to traditional infrared thermography which is able to identify defects with good qualities.

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“…As a new non-destructive testing technology, infrared thermography has been developed rapidly in recent years [3]. According to the different heating modes, the infrared thermal imaging includes pulse thermal (PT) method [4,5], lock-in method [6,7], and linear frequency modulation method [8,9]. The PT method has the advantages of fast detection, convenient on-line detection and so on.…”

Section: Introductionmentioning

confidence: 99%

Infrared thermal imaging detection of debonding defects in carbon fiber reinforced polymer based on pulsed thermal wave excitation

Zhao

Liu

et al. 2020

THERM SCI

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The carbon fiber reinforced composite has been widely used in many fields of the aviation industry due to the good resistance to fatigue damage, impact resistance, and easy processing. Firstly, the pulse heat conduction model of the carbon fiber reinforced composite is established, and the simulation experiment is completed based on the customized specimen with the defects. The influences of the thermal excitation power and pulse width on the defect detection effect are analyzed and obtained. The total harmonic distortion algorithm is used to process the experimental image sequence. The simulation and experimental results are compared and analyzed to verify their unity. It may provide the theoretical basis and empirical guidance for the defect detection of the composite materials.

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Quantitative detection of thermal barrier coating thickness based on simulated annealing algorithm using pulsed infrared thermography technology

Cited by 27 publications

References 15 publications

Nondestructive measurements of residual stress in air plasma‐sprayed thermal barrier coatings

Nondestructive measurements of residual stress in air plasma‐sprayed thermal barrier coatings

An Infrared Defect Sizing Method Based on Enhanced Phase Images

Infrared thermal imaging detection of debonding defects in carbon fiber reinforced polymer based on pulsed thermal wave excitation

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