Chapter 29. Characterization of Grain-Boundary Fracture in Ceramics

  1. J. P. Singh
  1. T. Nishida1,
  2. K. Maruyama1,
  3. N. Muraki2,
  4. H.-J. Kleebe3 and
  5. G. Pezzotti1

Published Online: 26 MAR 2008

DOI: 10.1002/9780470294437.ch29

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

Nishida, T., Maruyama, K., Muraki, N., Kleebe, H.-J. and Pezzotti, G. (1997) Characterization of Grain-Boundary Fracture in Ceramics, 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.ch29

Author Information

  1. 1

    Department of Materials, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, 606 Kyoto, Japan

  2. 2

    Toray Research Center, Inc., Sonoyama 3–3–7, Otsu-shi, Shiga 520, Japan

  3. 3

    Institut fur Materialforschung, Universitat Bayreuth, Ludwig-Thoma Strasse 36B, D-95440 Bayreuth, Germany

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:

  • ceramics;
  • phase-boundary film;
  • systematic modifications;
  • model materials;
  • quantitative fractography

Summary

The effect of systematic modifications in the chemistry of the phase-boundary film on the fracture mode and the macroscopic mechanical properties of Si3N4 ceramic and related composites was investigated. Model materials were prepared and only the bulk anion composition of the glassy-SiO2 intergranular phase was varied by adding increasing amounts of fluorine or chlorine to the material. Quantitative fractography and fracture mechanics characterizations were performed as a function of the amount of anion dopant. A threshold value for the anion amount in the grain-boundary glass (i.e., ? 1.5 wt %) was revealed for a large fraction of intergranular fracture to occur. Its existence is conceivable according to a percolation process of non-bridged SiO4-tetrahedra, which arises from the incorporation of anions into the intergranular film network.