Chapter 52. Effect of Al2O3 Phase Transformations on Gram Growth in ZrO2-Al2O3Nanocomposites

  1. Don Bray
  1. B. M. Smyser and
  2. R. D. Sisson Jr.

Published Online: 23 MAR 2010

DOI: 10.1002/9780470294499.ch52

22nd Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: B: Ceramic Engineering and Science Proceedings, Volume 19, Issue 4

22nd Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: B: Ceramic Engineering and Science Proceedings, Volume 19, Issue 4

How to Cite

Smyser, B. M. and Sisson, R. D. (1998) Effect of Al2O3 Phase Transformations on Gram Growth in ZrO2-Al2O3Nanocomposites, in 22nd Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: B: Ceramic Engineering and Science Proceedings, Volume 19, Issue 4 (ed D. Bray), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470294499.ch52

Author Information

  1. Worcester Polytechnic Institute, Worcester, MA 01609

Publication History

  1. Published Online: 23 MAR 2010
  2. Published Print: 1 JAN 1998

ISBN Information

Print ISBN: 9780470375594

Online ISBN: 9780470294499

SEARCH

Keywords:

  • corrosion;
  • benchmark;
  • alkaline;
  • evaporation;
  • efficiency

Summary

Tetragonal ZrO2 can be stabilized without chemical dopants by maintaining a grain size of 25 nm or less. In this research, Al2O3 is used to control the grain growth. Previous work indicated that a well dispersed mixture of ZrO2 and Al2O3 is needed to prevent grain growth at high temperatures. The current research is investigating the effect of Al2O3 phase transformations on grain growth at high temperatures and on the ability of Al2O3 to control the grain size of ZrO2. Nanophase Zr2 — Al2O3 powders were produced using several solution based methods. The powders were examined using XRD and TEM to determine the phase distribution and the grain size. Samples that successfully maintained the desired grain size contained mostly transition phases of Al2O3 such as δ- or θ- Al2O3 Samples that showed runaway grain growth tended to have more α- Al2O3 present. This observation indicates that the transition phases grow more slowly and thus are more effective for grains size control than the stable α phase.