Chapter 43. Improving the Reliability of High-Performance Ceramics Using Nondestructive Evaluation

  1. John B. Wachtman Jr
  1. D. J. Cotter,
  2. W. D. Koenigsberg,
  3. A. E. Pasto and
  4. L. J. Bowen

Published Online: 26 MAR 2008

DOI: 10.1002/9780470310502.ch43

12th Annual Conference on Composites and Advanced Ceramic Materials, Part 2 of 2: Ceramic Engineering and Science Proceedings, Volume 9, Issue 9/10

12th Annual Conference on Composites and Advanced Ceramic Materials, Part 2 of 2: Ceramic Engineering and Science Proceedings, Volume 9, Issue 9/10

How to Cite

Cotter, D. J., Koenigsberg, W. D., Pasto, A. E. and Bowen, L. J. (1988) Improving the Reliability of High-Performance Ceramics Using Nondestructive Evaluation, in 12th Annual Conference on Composites and Advanced Ceramic Materials, Part 2 of 2: Ceramic Engineering and Science Proceedings, Volume 9, Issue 9/10 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470310502.ch43

Author Information

  1. GTE Laboratories Incorporated Waltham, MA 02254

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1988

ISBN Information

Print ISBN: 9780470374818

Online ISBN: 9780470310502

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Keywords:

  • nondestructive;
  • radiography;
  • NDE;
  • microfocus;
  • silicon nitride

Summary

Results are presented from a program to improve the reliability of advanced silicon nitride ceramics through the use of nondestructive evaluation. A large quantity of silicon nitride test bars was inspected by microfocus radiography. In total, 76 bars were rejected because they contained major naturally occurring voids. A digital image processing system was used to obtain data on size, shape, and location of the voids. Failure stress was predicted based on a fracture mechanics model. For comparison, actual failure stress was measured for the bars and then related to the stress at the flaw location by an elemental analysis. Fractography was also performed on the broken bars. The Weibull modulus of the NDE rejected samples was 3.9 compared with 13.0 for the NDE accepted samples.