Chapter 12. Fracture Toughness of Oxide Fiber Reinforced Silicon Carbide Composites

  1. John B. Wachtman Jr
  1. Robert S. Kirk

Published Online: 26 MAR 2008

DOI: 10.1002/9780470314715.ch12

Proceedings of the 19th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - A: Ceramic Engineering and Science Proceedings, Volume 16, Issue 4

Proceedings of the 19th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - A: Ceramic Engineering and Science Proceedings, Volume 16, Issue 4

How to Cite

Kirk, R. S. (1995) Fracture Toughness of Oxide Fiber Reinforced Silicon Carbide Composites, in Proceedings of the 19th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - A: Ceramic Engineering and Science Proceedings, Volume 16, Issue 4 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470314715.ch12

Author Information

  1. 3M Company - St. Paul, MN 55144

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1995

ISBN Information

Print ISBN: 9780470375372

Online ISBN: 9780470314715

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Keywords:

  • fiber-reinforced;
  • siconex;
  • displacement;
  • pullout;
  • propagated

Summary

The fracture toughness of SICONEX™ Fiber-Reinforced Ceramic Composites, produced by the chemical vapor deposition of silicon carbide onto braided NEXTEL™ 312 Ceramic Fibers, was measured using a compact tension tester. The composites yielded a distinct R curve for the fracture toughness, beginning at 10 MPa m™ for composites where the silicon carbide was deposited at two times the weight of the fibers. Ceramic fiber braids coated with their weight of silicon carbide produced similar initial fracture toughness but little R curve behavior. Microscopic examination of the fracture surfaces indicated that the fiber tows, rather than the individual fibers, acted to give long-range clamping to the fractures. It was also shown that the angle of the braid relative to the fracture plane could change the bend strength by a factor of two.