Advertisement

Parallel Imaging of Thickness Variations and Disbonding of Thermal Barrier Coatings by Time-Resolved Infrared Radiometry (TRIR)

  • J. W. Maclachlan Spicer
  • W. D. Kerns
  • L. C. Aamodt
  • J. C. Murphy
Chapter
Part of the Review of Progress in Quantitative Nondestructive Evaluation book series

Abstract

Pulsed photothermal radiometry has been shown to be a useful thermally-based nondestructive evaluation technique for various thin films and layered specimens [1,2]. In this method the time development of the surface temperature is studied for both heating and cooling, during and after the application of a step heating pulse of duration, T. In this paper, we show that the method gives quantitative information about layered materials including measurement of coating thickness and the detection and characterization of disbonding between layers. Since all times are monitored, it is not necessary to know the thickness of the coating provided the heating pulse is set longer than the thermal transit time of the coating. As a result, both coating thickness and the integrity of the coating-substrate bond can be determined simultaneously.

Keywords

Coating Thickness Thermal Barrier Coating Heat Pulse Zirconia Coating Superalloy Substrate 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    P. Cielo, J. Appl. Phys. 56, No. 1, 230–234 (1984).CrossRefGoogle Scholar
  2. 2.
    R. E. Imhof, D. J. S. Birch, F. R. Thornley, J. R. Gilchrist and T. A. Strivens, J. Phys. D: Appl. Phys., 18, pp. L103 - L106 (1985).CrossRefGoogle Scholar
  3. 3.
    D. P. Almond, P. M. Patel and H. Reiter, Materials Evaluation 45, 471–475 (1987).Google Scholar
  4. 4.
    J. C. Murphy, J. W. Maclachlan, and L. C. Aamodt, in Review of Progress in Quantitative NDE, edited by D. O. Thompson and D.E. Chimenti ( Plenum Press, New York, 1988 ), Vol. 7, pp. 245–252.Google Scholar
  5. 5.
    J. W. Maclachlan, L. C. Aamodt, and J. C. Murphy, Ceram. Eng. Sci. Proc., Vol. 9, No. 9–10, pp. 1181–1188 (1988).CrossRefGoogle Scholar
  6. 6.
    J. W. Maclachlan Spicer, W. D. Kerns, L. C. Aamodt and J. C. Murphy, submitted to J. Nondestruct. Eval. (1989).Google Scholar
  7. 7.
    J. W. Maclachlan, L. C. Aamodt, and J. C. Murphy, in Review of Progress in Quantitative NDE, edited by D. 0. Thompson and D. E. Chimenti (Plenum Press, New York, 1989 ) Vol. 8, pp. 1297–1304.Google Scholar
  8. 8.
    L. C. Aamodt, J. W. Maclachlan Spicer, and J. C. Murphy, submitted to Photoacoustic and Photothermal Phenomena, Springer Series in Optical Sciences (Springer, Berlin, Heidelberg, 1990 ).Google Scholar
  9. 9.
    J. W. Maclachlan Spicer, W. D. Kerns, L. C. Aamodt, and J. C. Murphy, submitted to Photoacoustic and Photothermal Phenomena, Springer Series in Optical Sciences (Springer, Berlin, Heidelberg, 1990 ).Google Scholar

Copyright information

© Springer Science+Business Media New York 1990

Authors and Affiliations

  • J. W. Maclachlan Spicer
    • 1
  • W. D. Kerns
    • 1
  • L. C. Aamodt
    • 1
  • J. C. Murphy
    • 1
  1. 1.Center for NDE, Applied Physics LaboratoryThe Johns Hopkins UniversityLaurelUSA

Personalised recommendations