Chapter 16. Ultrasonic Detection of Surface Flaws in Sintered Alpha Silicon Carbide

  1. William Smothers
  1. W. P. Rogers and
  2. M. Srinivasan

Published Online: 26 MAR 2008

DOI: 10.1002/9780470320228.ch16

Proceedings of the 8th Annual Conference on Composites and Advanced Ceramic Materials: Ceramic Engineering and Science Proceedings, Volume 5, 7/8

Proceedings of the 8th Annual Conference on Composites and Advanced Ceramic Materials: Ceramic Engineering and Science Proceedings, Volume 5, 7/8

How to Cite

Rogers, W. P. and Srinivasan, M. (1984) Ultrasonic Detection of Surface Flaws in Sintered Alpha Silicon Carbide, in Proceedings of the 8th Annual Conference on Composites and Advanced Ceramic Materials: Ceramic Engineering and Science Proceedings, Volume 5, 7/8 (ed W. Smothers), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470320228.ch16

Author Information

  1. Standard Oil of Ohio Niagara Falls R&D Center Niagara Falls, NY 14302

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1984

ISBN Information

Print ISBN: 9780470374139

Online ISBN: 9780470320228

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Keywords:

  • ultrasonic testing;
  • finite element stress;
  • silicon nitride;
  • knoop indentations;
  • surface acoustic waue techniques

Summary

It is well recognized that surface and near-surface flaws control the strength of the majority of specimens from a population of sintered alpha silicon-carbide test bars. An investigation was carried out to examine the applicability of surface acoustic wave techniques (SAW) to detect two-dimensional Knoop-indented surface cracks in this material. The dependence of defect echo amplitude on the nominal crack size, as well as the direction of the sonic wave to the crack plane, are examined. The room-temperature strength testing of the bars containing these flaws have established, in a preliminary manner, a correlation between the defect echo amplitude and the strength of sintered alpha silicon carbide.