Chapter 28. Ultrasonic Characterization of Ceramic Joints

  1. John B. Wachtman Jr.
  1. W. A. Simpson Jr. and
  2. R. W. McClung

Published Online: 26 MAR 2008

DOI: 10.1002/9780470312568.ch28

Proceedings of the International Forum on Structural Ceramics Joining: Ceramic Engineering and Science Proceedings, Volume 10, Issue 11/12

Proceedings of the International Forum on Structural Ceramics Joining: Ceramic Engineering and Science Proceedings, Volume 10, Issue 11/12

How to Cite

Simpson, W. A. and McClung, R. W. (2008) Ultrasonic Characterization of Ceramic Joints, in Proceedings of the International Forum on Structural Ceramics Joining: Ceramic Engineering and Science Proceedings, Volume 10, Issue 11/12 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470312568.ch28

Author Information

  1. Metals and Ceramics Division Oak Ridge National Laboratory Oak Ridge, TN 37831

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1989

ISBN Information

Print ISBN: 9780470374887

Online ISBN: 9780470312568

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Keywords:

  • structural;
  • evaluation;
  • lamb waves;
  • detection;
  • thermal

Summary

The increasing use of structural ceramics in high-temperature applications has led to the need for nondestructive evaluation techniques to ensure the integrity of joints consisting of ceramics bonded to ceramics or to metals. We describe the development of ultrasonic techniques for the characterization of ceramic joints, including the ability to determine which face of a 50-μm-thick layer of braze filler metal is unbonded, thus providing information about the integrity of the ceramic-filler metal bond. We also describe the development of a rapid technique using Lamb waves to probe the bond between alumina coupons in flexure-strength specimens, whose geometry makes conventional ultrasonic evaluation of the bond difficult. Also described are techniques for the detection of cracking under sessile drops on alumina disks and the determination of the extent and profile of cracks produced in the bond of flexure-strength specimens subjected to three-point bending.