Chapter 22. Grain Size Control and Phase Transformations in Nanophase Al2O3-ZrO2

  1. J. P. Singh
  1. Bridget M. Smyser1,
  2. Jane F. Connelly1,
  3. Richard D. Sisson Jr.1 and
  4. Virgil Provenzano2

Published Online: 26 MAR 2008

DOI: 10.1002/9780470294437.ch22

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

Smyser, B. M., Connelly, J. F., Sisson, R. D. and Provenzano, V. (1997) Grain Size Control and Phase Transformations in Nanophase Al2O3-ZrO2, 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.ch22

Author Information

  1. 1

    Worcester Polytechnic Institute, Department of Materials Engineering, Worcester, MA 01609

  2. 2

    Naval Research Laboratory, Code 6320, Washington, DC 20375–5343

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:

  • nanophase;
  • phase distribution;
  • grain size;
  • grain growth;
  • mixing

Summary

The evolution of grain size and phase distribution in ZrO2-Al2O3 powders as a function of composition and heat treatment has been investigated. Colloidal dispersions of Al2O3 and ZrO2 were combined to obtain mixtures of 10%, 20%, 30% and 50% vol% Al2O3 in ZrO2. The powders were then calcined at 600 °C for 17 hours in air and heat treated at 1100 °C for 24 and 120 hours and at 1200 °C for 2 hours. XRD and TEM were used to determine the phases present and the grain size. The samples that maintained 100% tetragonal ZrO2 tended to have Al2O3 grains that were larger than the ZrO2 grains, precluding a grain boundary pinning mechanism for grain size control. In several cases, evidence of excessive grain growth in Al2O3 was found. In order to maintain the desired ZrO2 grain size with a smaller quantity of Al2O3, it will be necessary to improve the mixing of the two components and to reduce the starling size of Al2O3.