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http://dx.doi.org/10.7779/JKSNT.2017.37.2.75

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

Ranjit, Shrestha (Dept. of Mechanical Engineering, Graduate School, Kongju National University)
Kim, Wontae (Div. of Mechanical & Automotive Engineering, Kongju National University)
Publication Information
Journal of the Korean Society for Nondestructive Testing / v.37, no.2, 2017 , pp. 75-83 More about this Journal
Abstract
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.
Keywords
Silicon Carbide Coating; Nickel Based Superalloy; Thickness Measurement; Lock-In Thermography; Phase Angle;
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Times Cited By KSCI : 3  (Citation Analysis)
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