Chapter 66. Fabrication and Properties of Quasi-Isotropic Silicon Nitride-Boron Nitride Fibrous Monoliths

  1. J. P. Singh
  1. Gene A. Danko1,
  2. Gregory E. Hilmas1,
  3. John W. Halloran2 and
  4. Bruce King2

Published Online: 26 MAR 2008

DOI: 10.1002/9780470294437.ch66

Proceedings of the 21st Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 18, Issue 3

Proceedings of the 21st Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 18, Issue 3

How to Cite

Danko, G. A., Hilmas, G. E., Halloran, J. W. and King, B. (1997) Fabrication and Properties of Quasi-Isotropic Silicon Nitride-Boron Nitride Fibrous Monoliths, in Proceedings of the 21st Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 18, Issue 3 (ed J. P. Singh), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470294437.ch66

Author Information

  1. 1

    Advanced Ceramics Research, Inc., Tuscon AZ 85713

  2. 2

    University of Michigan, Ann Arbor, MI 48109–2136

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1997

ISBN Information

Print ISBN: 9780470375495

Online ISBN: 9780470294437

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Keywords:

  • fibrous monolithic ceramics;
  • green fiber;
  • room temperature;
  • delamination;
  • fracture energy

Summary

Quasi-isotropic Si3N4/BN fibrous monoliths have been fabricated from single-filament co-extruded green fiber with the [0°/45°/90°]s architecture. They are elasticly isotropic, with room temperature Young's modulus of 216°1 GPa. They exhibit graceful failure in flexure. The peak strength at room temperature is 330 MPa, associated with delamination along on-axis cell boundaries. Off-axis cell boundaries begin to fracture at a proportional limit of 280 MPa. Total work-of-fracture is 4700 J/m2 at room temperature. Graceful fracture also occurs at 1000°C and 1200°C, where the peak strength is 260 MPa and 143 MPa, respectively.