Measurement of Thermal Expansion Coefficients of a Thin Film of Different Ceramic Coatings by Shearography


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In the present work, thermal expansion coefficients of a number of ceramic coatings were studied by a non-destructive technique (NDT) known as shearography. Ceramic coatings, i.e., a white enamel and a yellow Acrylic Lacquer on a metallic alloy, i.e., carbon steels, were investigated at a temperature range simulating the severe weather temperatures in Kuwait, especially between the daylight and the night time temperatures, 20-60 0C. The investigation was focused on determining the in-plane displacement of the coating, which corresponds to the thermal deformation (strain), with respect to the applied temperature range. A mathematical relationship was derived along with the experimental data. The mathematical relationship described the thermal deformation of a coated film as a function of temperature. Furthermore, results of shearography indicate that the technique is found very useful NDT method not only for determining the thermal expansion coefficients of different coatings, but also the technique can be used as a 2D- microscope for monitoring the deformation of various coatings in at a submicroscopic scale.



Key Engineering Materials (Volumes 334-335)

Edited by:

J.K. Kim, D.Z. Wo, L.M. Zhou, H.T. Huang, K.T. Lau and M. Wang




K. Habib, "Measurement of Thermal Expansion Coefficients of a Thin Film of Different Ceramic Coatings by Shearography", Key Engineering Materials, Vols. 334-335, pp. 529-532, 2007

Online since:

March 2007





[1] K. Robert, ERF, Speckle Metrology, Academic Press, New York (1978), P. 2.

[2] H. Zhang and J. Ke, Determination of Residual Stress by Laser Speckle Shearing Interformetry and Hole Drilling Method, J. Exp. Mech. Vol. 1 (1986) pp.181-188.

[3] J. Shigley, Mechanical Engineering Design, McGraw-Hill 3 rd Edition, New York (1978), pp.67-69.

[4] K. Habib, Thermally induced deformations measured by shearography", Optics and Laser Technology. Vol. 37 (2005) pp.509-512.