Chapter 60. Superplastically Sinter-Forged Silicon Nitride

  1. Todd Jessen and
  2. Ersan Ustundag
  1. Naoki Kondo,
  2. Yoshikazu Suzuki and
  3. Tatsuki Ohji

Published Online: 28 MAR 2008

DOI: 10.1002/9780470294635.ch60

24th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: B: Ceramic Engineering and Science Proceedings, Volume 21, Issue 4

24th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: B: Ceramic Engineering and Science Proceedings, Volume 21, Issue 4

How to Cite

Kondo, N., Suzuki, Y. and Ohji, T. (2008) Superplastically Sinter-Forged Silicon Nitride, in 24th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: B: Ceramic Engineering and Science Proceedings, Volume 21, Issue 4 (eds T. Jessen and E. Ustundag), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470294635.ch60

Author Information

  1. National Industrial Research Institute of Nagoya Hirate-cho, Kita-ku, Nagoya, Aichi 462–85 10, JAPAN

Publication History

  1. Published Online: 28 MAR 2008
  2. Published Print: 1 JAN 2000

ISBN Information

Print ISBN: 9780470375693

Online ISBN: 9780470294635

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Keywords:

  • superplastic sinter forging technique;
  • superior mechanical;
  • silicon nitride;
  • isotropic silicon nitrides;
  • anisotropic microstructure

Summary

Near-net shape forming of silicon nitride, processed by a superplastic sinter-forging (SPSF) technique, was demonstrated. Also, the microstructure and mechanical properties of silicon nitride, produced by the SPSF technique, were investigated. The obtained specimen exhibited fine and highly anisotropic microstructures, where rod-shaped Si3N4 grains with sub-micrometer size tended to be aligned perpendicular to the forging direction. Very hi h bending strength of 2108 MPa as well as high fracture toughness of 8.3 MPaS·m1/2 were achieved when a stress was applied perpendicularly to the pressing direction. These results indicates that SPSF is a promising technique, since sintering and shape forming are conducted concurrently, and fabricated specimen exhibits superior mechanical properties.