Advertisement

High-Frequency Ultrasonic Characterization of ZrO2 Layer Thicknesses Using Digital Spectral Analysis

  • M. S. O’Brien
  • S. M. Kramer
  • M. D. C. Moles
  • A. N. Sinclair
Chapter
Part of the Review of Progress in Quantitative Nondestructive Evaluation book series

Abstract

Embrittlement of Zr−2.5%Nb pressure tubes from CANDU nuclear reactors has recently become a concern in the Canadian nuclear industry. While a full understanding of the mechanisms involved has not yet been achieved, it is known that hydrogen/deuterium, liberated through oxidization of the tube’s inner surface, is absorbed into the metal where it eventually precipitates out as weak, brittle hydride platelets. Knowledge of the nature and extent of oxide formation may thus give indications about the degree of hydrogen uptake and embrittlement in the tubes. In particular, a reliable, nondestructive technique for determining the thickness and integrity of these oxide layers is needed. Theoretically, such an evaluation is possible using ultrasonic spectroscopy.

Keywords

Reflection Coefficient Acoustic Impedance Pressure Tube Magnitude Spectrum Ontario Hydro 
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.
    L. Paradis, R. Saglio and Y. Serruys, “Ultrasonic Signal Processing for Thickness Measurement and Detection of Near-Surface Defects”, Materials Evaluation 44, Oct. 1986.Google Scholar
  2. 2.
    C. J. Bell, N. F. Haynes and P. J. McIntyre, “The Application of Broadband Ultrasonic Spectroscopy to the Study of Layered Media”, J. Acoust. Soc. Am., vol. 64, no. 1, pp 1645–51, Dec. 1978.Google Scholar
  3. 3.
    G. S. Kino, Acoustic Waves: Devices, Imaging and Analog Signal Processing, (Prentice-Hall, Englewood, New Jersey, 1987 ).Google Scholar
  4. 4.
    L. M. Brekhovskikh, Waves in Layered Media, 2nd ed., ( Academic Press Inc, New York, 1980.MATHGoogle Scholar

Copyright information

© Springer Science+Business Media New York 1990

Authors and Affiliations

  • M. S. O’Brien
    • 1
  • S. M. Kramer
    • 1
  • M. D. C. Moles
    • 1
  • A. N. Sinclair
    • 2
  1. 1.Nondestructive and Fracture Evaluation Section KR 174Ontario Hydro Research DivisionTorontoCanada
  2. 2.Dept.of Mechanical EngineeringUniversity of TorontoTorontoCanada

Personalised recommendations