Chapter 26. Fracture Toughness of MgCr2O4-ZrO2 Composites

  1. William Smothers
  1. J. P. Singh

Published Online: 26 MAR 2008

DOI: 10.1002/9780470320280.ch26

Proceedings of the 9th Annual Conference on Composites and Advanced Ceramic Materials: Ceramic Engineering and Science Proceedings, Volume 6, Issue 7/8

Proceedings of the 9th Annual Conference on Composites and Advanced Ceramic Materials: Ceramic Engineering and Science Proceedings, Volume 6, Issue 7/8

How to Cite

Singh, J. P. (1985) Fracture Toughness of MgCr2O4-ZrO2 Composites, in Proceedings of the 9th Annual Conference on Composites and Advanced Ceramic Materials: Ceramic Engineering and Science Proceedings, Volume 6, Issue 7/8 (ed W. Smothers), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470320280.ch26

Author Information

  1. Materials Science and Technology Div. Argonne National Laboratory, Argonne, IL 60439

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1985

ISBN Information

Print ISBN: 9780470374337

Online ISBN: 9780470320280

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Keywords:

  • molten slag;
  • ZrO2;
  • crack-arresting;
  • notched-beam;
  • brittle

Summary

The effect of unstabilized ZrO2 inclusions on the fracture surface enrgy of MgCr2O4 was studied as a function of ZrO2 content. It was observed that fracture surface energy increases with increasing ZrO2 content, and reaches the maximum value of 24.5 J/m2 at 165 vol% ZrO2. This represents an ≈ fourfold increase in the fracture surface energy of MgCr2O4 as a result of ZrO2 inclusions. It is proposed that this improvement results from the energy absorbed by the microcracks formed in the MgCr2O4 matrix as a result of the tetragonal [RIGHTWARDS ARROW] monoclinic phase transformation of ZrO2 and the associated volume expansion.