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Thermophysical Properties of Thermal Sprayed Coatings on Carbon Steel Substrates by Photothermal Radiometry

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Abstract

Laser infrared photothermal radiometry (PTR) was used to measure the thermophysical properties (thermal diffusivity and conductivity) of various thermal sprayed coatings on carbon steel. A one-dimensional photothermal model of a three-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 sprayed coatings examined in this work were obtained when a multiparameter-fit optimization algorithm was used with the backscattered 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 are known. The ability of PTR to measure the thermophysical properties and the coating thickness has a strong potential as a method for in situ characterization of thermal spray coatings.

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Authors and Affiliations

  1. Photothermal and Optoelectronic Diagnostics Laboratories, Department of Mechanical and Industrial Engineering, University of Toronto, Toronto, Ontario, M5S 3G8, Canada

    J. A. Garcia & A. Mandelis

  2. Edison Welding Institute, Columbus, Ohio, 43221-3585, U.S.A

    B. Farahbakhsh & I. Harris

  3. U.S. Air Force Research Laboratories, 2230 Tenth St., Suite 1, Wright Patterson Air Force Base, Ohio, 45433, U.S.A

    C. Lebowitz

Authors
  1. J. A. Garcia
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  2. A. Mandelis
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  3. B. Farahbakhsh
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  4. C. Lebowitz
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  5. I. Harris
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Garcia, J.A., Mandelis, A., Farahbakhsh, B. et al. Thermophysical Properties of Thermal Sprayed Coatings on Carbon Steel Substrates by Photothermal Radiometry. International Journal of Thermophysics 20, 1587–1602 (1999). https://doi.org/10.1023/A:1021457625651

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  • DOI: https://doi.org/10.1023/A:1021457625651

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