Chapter 20. Intra-Granular Strengthening and Toughening by Brittle Nanoparticles in Ceramic Nanocomposites

  1. J. P. Singh
  1. Tatsuki Ohji

Published Online: 26 MAR 2008

DOI: 10.1002/9780470294437.ch20

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

Ohji, T. (1997) Intra-Granular Strengthening and Toughening by Brittle Nanoparticles in Ceramic Nanocomposites, 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.ch20

Author Information

  1. National Industrial Research Institute of Nagoya, Nagoya, 462 Japan Yong-Ho Choa, and Koichi Niihara

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:

  • ceramic nanocomposite;
  • fracture strength;
  • residual stress;
  • strengthening mechanism;
  • transgranular fracture

Summary

Crack tip bridging by particles is considered to be the primary strengthening mechanism of a ceramic nanocomposite. Small, brittle particulate inclusions have been shown to cause crack tip bridging at short distances behind the crack-tip. This mechanism leads to modest toughness increases but to a very steep R-curve, and it is the latter that results in the very high fracture strength of ceramic nanocomposite. The localized high residual stress about the particles (particularly in the case of silicon carbide/alumina material) causes this strengthening mechanism even at a small volume fraction of 5%. The present study predicts the magnitude of the toughness increase and the extent of R-curve behavior for nanocomposite.