Chapter 3. Effect of Anisotropic Thermal Expansion on the Strength of Phosphate-Bonded Al2O3 Bicrystals

  1. William J. Smothers
  1. Morteza Soltani and
  2. James F. Benzel

Published Online: 26 MAR 2008

DOI: 10.1002/9780470310465.ch3

Application of Refractories: Ceramic Engineering and Science Proceedings, Volume 9, Issue 1/2

Application of Refractories: Ceramic Engineering and Science Proceedings, Volume 9, Issue 1/2

How to Cite

Soltani, M. and Benzel, J. F. (1988) Effect of Anisotropic Thermal Expansion on the Strength of Phosphate-Bonded Al2O3 Bicrystals, in Application of Refractories: Ceramic Engineering and Science Proceedings, Volume 9, Issue 1/2 (ed W. J. Smothers), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470310465.ch3

Author Information

  1. School of Materials Engineering, Georgia Institute of Technology, Atlanta, GA 30332

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1988

ISBN Information

Print ISBN: 9780470374764

Online ISBN: 9780470310465

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Keywords:

  • residual stress;
  • utilized;
  • polycrystalline;
  • thermal expansion;
  • anisotropy

Summary

Alumina bicrystals were produced using sodium metaphosphate as the bonding agent. The room temperature tensile strengths of bicrystals containing no crystallographic mismatch, or controlled amounts of twist, tilt and combinations of twist and tilt mismatch were determined. These results indicated that the strength of the bicrystal grain boundaries decreased as the amount of residual stress present increased. These stresses were directly proportional to the differential thermal expansion across the grain boundary which is proportional to the degree of mismatch and maximum firing temperature.