Chapter 15. Mechanical Properties and Microstructure of Si3N4-Whisker-Reinforced Si3N4 Matrix Composites

  1. John B. Wachtman Jr.
  1. C. -Y. Chu and
  2. J. P. Singh

Published Online: 26 MAR 2008

DOI: 10.1002/9780470313008.ch15

A Collection of Papers Presented at the 14th Annual Conference on Composites and Advanced Ceramic Materials, Part 1 of 2: Ceramic Engineering and Science Proceedings, Volume 11, Issue 7/8

A Collection of Papers Presented at the 14th Annual Conference on Composites and Advanced Ceramic Materials, Part 1 of 2: Ceramic Engineering and Science Proceedings, Volume 11, Issue 7/8

How to Cite

Chu, C. .-Y. and Singh, J. P. (2008) Mechanical Properties and Microstructure of Si3N4-Whisker-Reinforced Si3N4 Matrix Composites, in A Collection of Papers Presented at the 14th Annual Conference on Composites and Advanced Ceramic Materials, Part 1 of 2: Ceramic Engineering and Science Proceedings, Volume 11, Issue 7/8 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470313008.ch15

Author Information

  1. Materials and Components Technology Division Argonne National Laboratory Argonne, IL 60439

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1990

ISBN Information

Print ISBN: 9780470374924

Online ISBN: 9780470313008

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Keywords:

  • microstructures;
  • elastic modulus;
  • flexural strength;
  • ceramic;
  • degradation

Summary

Room-temperature elastic modulus, hardness, flexural strength, and fracture toughness of silicon nitride (Si3N4)-whisker-reinforced Si3N4 matrix composites with up to 35 vol% of whisker were measured and correlated with microstructures. Both scanning and transmission electron microscopy were used for structural characterization. The toughness of the composite was observed to increase from 6.5–8.8 MPa ✓m with the addition of 5 vol% Si3N4 whisker. This represents a 1.4-fold increase in toughness. Correspondingly, the strength increased from 673–802 MPa. The toughness and strength of the composites is believed to be controlled by both whisker strengthening and matrix grain size effects.