Chapter 14. Material Improvement Through Iterative Process Development

  1. William Smothers
  1. David W. Richerson1,
  2. Jay R. Smyth1 and
  3. Karsten H. Styhr2

Published Online: 26 MAR 2008

DOI: 10.1002/9780470320167.ch14

Proceedings of the 7th Annual Conference on Composites and Advanced Ceramic Materials: Ceramic Engineering and Science Proceedings, Volume 4, Issue 9/10

Proceedings of the 7th Annual Conference on Composites and Advanced Ceramic Materials: Ceramic Engineering and Science Proceedings, Volume 4, Issue 9/10

How to Cite

Richerson, D. W., Smyth, J. R. and Styhr, K. H. (1983) Material Improvement Through Iterative Process Development, in Proceedings of the 7th Annual Conference on Composites and Advanced Ceramic Materials: Ceramic Engineering and Science Proceedings, Volume 4, Issue 9/10 (ed W. Smothers), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470320167.ch14

Author Information

  1. 1

    Garret Turbine Engine Co. Box 5217, Phoenix, AZ 85010

  2. 2

    AiResearch Casting Co. 19800 Van Ness Ave., Torrance, CA 90509

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1983

ISBN Information

Print ISBN: 9780470374047

Online ISBN: 9780470320167

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Keywords:

  • reliability;
  • sintered;
  • reliability;
  • optimized;
  • schematically

Summary

The use of an iterative process development approach is described for improvement of the properties and reliability of hot-pressed silicon nitride, slip-cast reaction-bonded silicon nitride, and injection-molded sintered silicon nitride. The 1375°C strength of the hot-pressed silicon nitride was increased from 140 MPa to >350 MPa, and the Weibull slope was increased from 7.2 to >10. The room-temperature strength of slip-cast reaction-bonded silicon nitride was improved from typically 220 MPa with a Weibull slope of 7.8 to 330 MPa with a Weibull slope of 15.8. The room-temperature and 1230°C strength of injection-molded sintered silicon nitride were increased respectively from 495 to 765 MPa and from 360 to 575 MPa.