Theoretical and experimental study on thermal barrier coating (TBC) uneven thickness detection using pulsed infrared thermography technology

Tang, Qingju; Liu, Junyan; Dai, Jingmin; Yu, Zhou

doi:10.1016/j.applthermaleng.2016.12.032

Cited by 43 publications

(11 citation statements)

References 11 publications

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“…Figure 8 shows the vs. coating thickness dependence with the 1.34 (K −1 s −1/2 ) threshold value obtained by Equation (8). Based on the linear fitting of the data in Figure 8, the equation for coating thickness dependence on the threshold time has been obtained in the form:…”

Section: Resultsmentioning

confidence: 99%

“…There have been a lot of IR thermographic test procedures and data processing algorithms suggested for evaluating coating thickness [ 7 ]. Thermal contrast methods [ 8 ] require choosing a reference point (area) that is suitable for defect detection but may be difficult for coating thickness quantification if heating is uneven. Pulse phase and lock-in thermographic techniques allow finding a correlation between the Fourier phase and coating thickness, but the corresponding relationships are complicated, like a fourth-order polynomial [ 9 ].…”

Section: Introductionmentioning

confidence: 99%

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Active IR Thermography Evaluation of Coating Thickness by Determining Apparent Thermal Effusivity

et al. 2020

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Pulsed thermography is a common technique for nondestructive testing (NDT) of materials. This study presents the apparent effusivity method for the quantitative evaluation of coating thickness in a one-sided thermal NDT procedure. The proposed algorithm is based on determining a threshold value of apparent effusivity, which can be found for particular coating-on-substrate structures. It has been found that the square root of the time at which the apparent effusivity curve reaches this threshold is proportional to the coating thickness. The efficiency of the proposed approach is demonstrated by analytical modeling and experimentation performed on thermally-sprayed coatings.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Active IR Thermography Evaluation of Coating Thickness by Determining Apparent Thermal Effusivity

et al. 2020

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“…Thermal barrier coatings mainly prevent heat transfer and penetration of corrosive salts in base metal structures. These coatings may be used to increase the efficiency of hightemperature turbines [15][16][17][18]. Considering that repairing a turbine to change old blades entails high cost, the development of thermal barrier coatings leads to low-cost repair by depositing a coating instead of replacing old blades.…”

Section: Introductionmentioning

confidence: 99%

Mechanical and corrosion performance of multilayer ceramic coatings deposited on an austenitic stainless steel using plasma spray

Kiahosseini

Aminian

2019

Bull Mater Sci

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This research investigated consecutive multilayer thermal barrier coatings, including Ni 3 Al-Al 2 O 3-Al 2 O 3 /MgO, produced by plasma spray with outer layer thicknesses of 50, 100 and 150 μm deposited on an AISI 316 stainless steel. X-ray diffraction, scanning electron microscopy, Rockwell-B hardness measurements, pin-on-disk wear test and potentiodynamic polarization test were performed to evaluate the specimens. The results revealed that the structure of the produced coatings was completely crystalline. An increase in the coating thickness formed a smooth surface and a low degree of roughness and promoted grain growth. According to the Hall-Petch equation, the degree of hardness decreased from 99 to 92 HRB, and the friction coefficient decreased from 1.25 to 0.6 because of low surface roughness. An adherence test performed with a Brinell hardness test showed that an increase in the layer thickness improved the coating adherence coefficient (d p/dr) from 0.083 to 0.118 kg μm −1. The corrosion test results indicated that the increase in the coating thickness caused a decrease in corrosion current density from 1.1 to 0.008 mA cm −2 .

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“…Temperature is a very important physical quantity. For temperature measurement, many techniques are available, e.g., thermocouple [1,2], thermistor [3], resistance temperature detector [4], and infrared thermography [5][6][7][8], etc. As an advanced measurement technology, infrared thermography can transform the thermal energy emitted by objects into an electronic video signal [9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Application of silicon-based camera for measurement of non-homogeneous thermal field on realistic specimen surface

Zhang

Marty

Maynadier

et al. 2019

Applied Thermal Engineering

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The high-cost low-resolution infrared cameras operating in middle infrared spectral ranges are widely used to detect the thermal fields. In this study, a low-cost high-resolution silicon-based sensor camera operating in near infrared spectral ranges is used to perform the observation of the thermal fields on the realistic specimen surface. In near-infrared spectral ranges, a small temperature variation led to a large modification in the sensor illumination, inducing acquired images with over saturation or poor dynamic range of gray levels. To address this problem, an algorithm was used to precisely adjust the exposure time to acquire images with constant gray level whatever the temperature evolution is, and then used in heating experiment of a steel specimen. Results showed that images with constant gray level could be acquired during the experiment. A special radiometric model was used to perform near-infrared thermography. Based on this radiometric model, the thermal fields on steel specimen surface were successfully reconstructed without measuring surface emissivity.

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Theoretical and experimental study on thermal barrier coating (TBC) uneven thickness detection using pulsed infrared thermography technology

Cited by 43 publications

References 11 publications

Active IR Thermography Evaluation of Coating Thickness by Determining Apparent Thermal Effusivity

Active IR Thermography Evaluation of Coating Thickness by Determining Apparent Thermal Effusivity

Mechanical and corrosion performance of multilayer ceramic coatings deposited on an austenitic stainless steel using plasma spray

Application of silicon-based camera for measurement of non-homogeneous thermal field on realistic specimen surface

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