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Failure Prediction of Hot-Pressed Si3N4 Ceramics by NDE FREE

[+] Author Affiliations
J. P. Singh, R. A. Roberts, J. J. Vaitekunas, W. A. Ellingson

Argonne National Laboratory, Argonne, IL

Paper No. 87-GT-7, pp. V005T12A003; 4 pages
doi:10.1115/87-GT-7
From:
  • 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

abstract

Results are presented on the detection of critical flaws in hot-pressed Si3N4 with Fe inclusions by nondestructive evaluation (NDE) and fractographic observation. The NDE methods employed included (1) low-energy contact radiography with digital image enhancement and (2) through-transmission and backscatter ultrasonic imaging. A comparison of NDE and fractography results indicates that the backscatter ultrasonic method may be more suitable than low-kV contact radiography for the detection of near-surface flaws.

Copyright © 1987 by ASME
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