Thermal property measurement for thermal barrier coatings using pulsed thermal imaging – multilayer analysis method

Sun, Jie; Tao, Ning

doi:10.1063/1.4940564

Cited by 5 publications

(4 citation statements)

References 12 publications

(17 reference statements)

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“…They compared pulsed thermography and thermal wave interferometry to estimate ageing effects of the TBC [195,196]. Sun et al showed a multilayer analysis method to detect change in TBC properties as well [197]. Meola et al developed a non-destructive testing method to detect small remaining ceramic fragments in the casted core [198].…”

Section: Hot Gas Component Monitoringmentioning

confidence: 99%

A Review of NDT/Structural Health Monitoring Techniques for Hot Gas Components in Gas Turbines

Mevissen

Meo

2019

Sensors

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The need for non-destructive testing/structural health monitoring (SHM) is becoming increasingly important for gas turbine manufacturers. Incipient cracks have to be detected before catastrophic events occur. With respect to condition-based maintenance, the complex and expensive parts should be used as long as their performance or integrity is not compromised. In this study, the main failure modes of turbines are reported. In particular, we focus on the turbine blades, turbine vanes and the transition ducts of the combustion chambers. The existing monitoring techniques for these components, with their own particular advantages and disadvantages, are summarised in this review. In addition to the vibrational approach, tip timing technology is the most used technique for blade monitoring. Several sensor types are appropriate for the extreme conditions in a gas turbine, but besides tip timing, other technologies are also very promising for future NDT/SHM applications. For static parts, like turbine vanes and the transition ducts of the combustion chambers, different monitoring possibilities are identified and discussed.

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Section: Hot Gas Component Monitoringmentioning

confidence: 99%

A Review of NDT/Structural Health Monitoring Techniques for Hot Gas Components in Gas Turbines

Mevissen

Meo

2019

Sensors

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“…When determining these characteristics experimentally, apparent values of effusivity may significantly differ from 'true' ones because of their dependence on test conditions. In TNDT, the use of the effusivity parameter was first discussed by Balageas et al [8] and later developed by Sun [9]. The methodology of determining diffusivity by applying flash heating was first suggested in the framework of the heat conduction theory by Parker et al [10] and later extended by several researchers to include TNDT [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Characterizing impact damage in GFRP/CFRP composites by determining thermal effusivity/diffusivity

Вавилов

Чулков

Smotrov

et al. 2019

Meas. Sci. Technol.

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Local variations of thermal effusivity and diffusivity are suggested as indicators of severity of impact damage in composites. A relative variation of diffusivity is a unique parameter of composite quality, while relative variations of apparent effusivity are time-dependent in non-adiabatic samples heated with a square pulse thus requiring a proper choice of optimum observation time. In this study, 36 samples made of glass-fiber-reinforced plastic and 54 samples made of carbon-fiber-reinforced plastic were fabricated. Each sample was subjected to a series of three impacts at the same location on each specimen. The energies of these impacts were 5, 10, and 20 J, applied in that or reverse order. Composite thermal properties were determined in a semi-automatic way with a small participation of the thermographer. This provided data spread from 0.6% to 2.4% for all evaluated parameters. The damage after each impact was evaluated by both one-and two-sided thermal nondestructive testing procedures on each impact site and on the surface opposite each impact site. The test results were statistically evaluated and revealed increasing values of effusivity/diffusivity as the impact energy increased and as second and third impacts were applied. However, if the order of impact energies was reversed, and changed to 20, 10, and 5 J, much smaller changes in damage were observed after each sequential impact. It appears that the most severe defect occurs after the first impact of 20 J, and further impacts of lower energies do not create much additional damage.

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“…Thus, the effectiveness of non-destructive testing (NDT) for the evaluation of coating is of great significance. Infrared thermography (IRT) as a NDT can be used for the testing and evaluation of coating [10][11][12][13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Thermal Analysis of Silicon Carbide Coating on a Nickel based Superalloy Substrate and Thickness Measurement of Top Layers by Lock-in Infrared Thermography

Shrestha¹,

Kim²

2017

Journal of the Korean Society for Nondestructive Testing

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In this paper, we investigate the capacity of the lock-in infrared thermography technique for the evaluation of non-uniform top layers of a silicon carbide coating with a nickel based superalloy sample. The method utilized a multilayer heat transfer model to analyze the surface temperature response. The modelling of the sample was done in ANSYS. The sample consists of three layers, namely, the metal substrate, bond coat and top coat. A sinusoidal heating at different excitation frequencies was imposed upon the top layer of the sample according to the experimental procedures. The thermal response of the excited surface was recorded, and the phase angle image was computed by Fourier transform using the image processing software, MATLAB and Thermofit Pro. The correlation between the coating thickness and phase angle was established for each excitation frequency. The most appropriate excitation frequency was found to be 0.05 Hz. The method demonstrated potential in the evaluation of coating thickness and it was successfully applied to measure the non-uniform top layers ranging from 0.05 mm to 1 mm with an accuracy of 0.000002 mm to 0.045 mm.

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Thermal property measurement for thermal barrier coatings using pulsed thermal imaging – multilayer analysis method

Cited by 5 publications

References 12 publications

A Review of NDT/Structural Health Monitoring Techniques for Hot Gas Components in Gas Turbines

A Review of NDT/Structural Health Monitoring Techniques for Hot Gas Components in Gas Turbines

Characterizing impact damage in GFRP/CFRP composites by determining thermal effusivity/diffusivity

Thermal Analysis of Silicon Carbide Coating on a Nickel based Superalloy Substrate and Thickness Measurement of Top Layers by Lock-in Infrared Thermography

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