Advanced Ultrasonic NDE Methods for Characterizing Porosity in SiC PUBLIC ACCESS

[+] Author Affiliations
D. C. Kunerth, K. L. Telschow

EG&G Idaho, Inc., Idaho Falls, ID

Paper No. 87-GT-6, pp. V005T12A002; 6 pages
  • ASME 1987 International Gas Turbine Conference and Exhibition
  • Volume 5: Manufacturing Materials and Metallurgy; Ceramics; Structures and Dynamics; Controls, Diagnostics and Instrumentation; Process Industries; General
  • Anaheim, California, USA, May 31–June 4, 1987
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7927-6
  • Copyright © 1987 by ASME


Ultrasonic techniques are being developed to detect and characterize porosity in advanced ceramic materials. The techniques use the acoustic backscatter resulting from the porosity or other anomalies and the ultrasonic signal timing and energy characteristics corresponding to propagation velocity and signal amplitude. Although all of the techniques are acoustic in nature, different signal processing algorithms provide different information about the porosity distribution. Four techniques are presented as well as experimental results from a sample of silicon carbide having a known porosity distribution. Information obtained from radiography and microscopic optical examination are compared with the ultrasonic results.

Copyright © 1987 by ASME
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