Abstract
Laser infrared photothermal radiometry (PTR) offers a nondestructive and remote technique for surface and coating characterization. This study summarizes the application of this technique to determine the thermophysical properties (thermal diffusivity and conductivity) of various thermal spray coated carbon steel substrates. In order to infer the material properties from the measurement scheme, a one-dimensional photothermal model of a 3-layered system in the backscattered mode was introduced and compared with experimental measurements. The uppermost layer was used to represent a roughness-equivalent layer, a second layer represented the thermal sprayed coating and the third layer represented the substrate. The thermophysical parameters of thermal spray coatings examined in this work were obtained when a multi-parameter optimization algorithm was used to fit the PTR experimental results. The results also suggested a good method to determine the thickness of tungsten carbide and stainless steel thermal spray coatings once the thermophysical properties were known. Excellent correlations between the experimental and theoretical results indicates the potential of the PTR technique for in-situ monitoring of coating process and characterization of thermal spray coatings.
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