Chapter 50. Thermal Wave Nondestructive Evaluation of Ceramic Matrix Composite Components

  1. J. P. Singh
  1. P. Khandelwal1,
  2. S. M. Shepard2 and
  3. T. Ahmed2

Published Online: 26 MAR 2008

DOI: 10.1002/9780470294444.ch50

Proceedings of the 21st Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - B: Ceramic Engineering and Science Proceedings, Volume 18, Issue 4

Proceedings of the 21st Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - B: Ceramic Engineering and Science Proceedings, Volume 18, Issue 4

How to Cite

Khandelwal, P., Shepard, S. M. and Ahmed, T. (1997) Thermal Wave Nondestructive Evaluation of Ceramic Matrix Composite Components, in Proceedings of the 21st Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - B: Ceramic Engineering and Science Proceedings, Volume 18, Issue 4 (ed J. P. Singh), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470294444.ch50

Author Information

  1. 1

    Allison Engine Company, P.O. Box 420, W-5 Indianapolis, IN 46206–0420

  2. 2

    Thermal Wave Imaging, Inc., 1889 W. 12 Mile Rd., Lathrup Village, MI 48076

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1997

ISBN Information

Print ISBN: 9780470375532

Online ISBN: 9780470294444

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Keywords:

  • delaminations;
  • nondestructive;
  • porosity;
  • capability;
  • delaminations

Summary

Since ceramic matrix composite (CMC) components are typically used in applications where adverse high-temperature conditions prevail, it is extremely important that CMC parts are free of defects, such as anomalous porosity, inclusions, or delaminations, before they are installed. We have investigated the use of a noncontact, time dependent, infrared (IR) method for nondestructive evaluation (NDE) of CMCs on wide variety of calibration standards (variable porosity and discrete flaws) and gas turbine components. The method, pulsed thermal wave imaging (PTWI), utilizes optical flashlamps to generate a thermal pulse at the sample surface, which is transmitted into the bulk. Results indicate that 3 to 5% changes in porosity can be discerned in 2-D and 3-D specimens fabricated using the varying number of pyrolysis cycles. Also, subsurface thermally insulating and conducting targets at various depths were detected. This technique has been applied to inspect gas turbine components at various stages of the manufacturing process.