Chapter 48. Relationships Between Toughness and Microstructure of Reaction Bonded Si3N4

  1. John B. Wachtman Jr.
  1. Annamarie Lightfoot,
  2. Julia Sigalovsky and
  3. John S. Haggerty

Published Online: 26 MAR 2008

DOI: 10.1002/9780470313978.ch48

Proceedings of the 16th Annual Conference on Composites and Advanced Ceramic Materials, Part 2 of 2: Ceramic Engineering and Science Proceedings, Volume 13, Issue 9/10

Proceedings of the 16th Annual Conference on Composites and Advanced Ceramic Materials, Part 2 of 2: Ceramic Engineering and Science Proceedings, Volume 13, Issue 9/10

How to Cite

Lightfoot, A., Sigalovsky, J. and Haggerty, J. S. (1994) Relationships Between Toughness and Microstructure of Reaction Bonded Si3N4, in Proceedings of the 16th Annual Conference on Composites and Advanced Ceramic Materials, Part 2 of 2: Ceramic Engineering and Science Proceedings, Volume 13, Issue 9/10 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470313978.ch48

Author Information

  1. Massachusetts Institute of Technology Cambridge, MA 02139

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1994

ISBN Information

Print ISBN: 9780470375198

Online ISBN: 9780470313978

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Keywords:

  • concentration;
  • modification;
  • transformation;
  • evaluate;
  • implementation

Summary

Fracture toughnesses of nominally identical batches of reaction bonded silicon nitride differed significantly (-2.0 and -2.7 MPa·ml/2). Detailed fractographic and microstructural characterizations investigated underlying factors. Subtile differences between high and low toughness RBSN and between constituent Si powders have been revealed through SEM/FEG, TEM, BET, Hg-porosimetry, and XRD. The results illustrate the need for behavioral models to guide microstructural design and to interpret properties of brittle materials with intermediate levels of porosity.