Chapter 5. Fabrication and Properties of Si3N4 Composites Reinforced by SiC Whiskers and Particles

  1. John B. Wachtman Jr.
  1. Hironori Kodama and
  2. Tadahiko Miyoshi

Published Online: 28 MAR 2008

DOI: 10.1002/9780470310588.ch5

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

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

How to Cite

Kodama, H. and Miyoshi, T. (1989) Fabrication and Properties of Si3N4 Composites Reinforced by SiC Whiskers and Particles, in A Collection of Papers Presented at the 13th Annual Conference on Composites and Advanced Ceramic Materials, Part 2 of 2: Ceramic Engineering and Science Proceedings, Volume 10, Issue 9/10 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470310588.ch5

Author Information

  1. Hitachi Research Laboratory Hitachi, Ltd. 4026 Kuji-cho, Hitachi-shi Ibaraki-ken 319-12 Japan

Publication History

  1. Published Online: 28 MAR 2008
  2. Published Print: 1 JAN 1989

ISBN Information

Print ISBN: 9780470374870

Online ISBN: 9780470310588

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Keywords:

  • silicon nitride;
  • silicon carbide momfilament fibers;
  • textron specialty materials;
  • carbon coating;
  • matrix powder

Summary

Effects of adding SiC in both the whisker and particulate forms as reinforcing materials to Si3N4 matrix ceramics on composite properties were investigated. The maximum fracture toughness of these composites was 10.5 MPa m1/2, and flexural strength was 550 MPa for addition of 20 vol% of SiC whiskers and 10 vol% of SiC particles having an average particle size of 40 μm. Reinforcing mechanisms observed in these composites were crack deflection and crack branching by SiC particles and pullout of SiC whiskers. The effectiveness of utilizing two different reinforcing mechanisms together, that is, the mechanisms acting on the crack front (crack deflection, crack branching, and crack pinning) and the mechanism of fiber pullout, for improving fracture toughness of composites was demonstrated in this study.