Chapter 21. Processing Contributions to Microcrack Formation in ZTA Composites

  1. John B. Wachtman Jr.
  1. K. J. Konsztowicz and
  2. S. G. Whiteway

Published Online: 26 MAR 2008

DOI: 10.1002/9780470313053.ch21

14th Annual Conference on Composites and Advanced Ceramic Materials, Part 2 of 2: Ceramic Engineering and Science Proceedings, Volume 11, Issue 9/10

14th Annual Conference on Composites and Advanced Ceramic Materials, Part 2 of 2: Ceramic Engineering and Science Proceedings, Volume 11, Issue 9/10

How to Cite

Konsztowicz, K. J. and Whiteway, S. G. (1990) Processing Contributions to Microcrack Formation in ZTA Composites, in 14th Annual Conference on Composites and Advanced Ceramic Materials, Part 2 of 2: Ceramic Engineering and Science Proceedings, Volume 11, Issue 9/10 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470313053.ch21

Author Information

  1. Atlantic Research Laboratory, National Research Council of Canada, Halifax, N.S., B3H 3Z1

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1990

ISBN Information

Print ISBN: 9780470374931

Online ISBN: 9780470313053

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Keywords:

  • zirconia;
  • microstructure;
  • microcrack;
  • agglomerates;
  • heteroflocculation

Summary

Zirconiai/alumina composites, in which the 3Y-PSZ content was varied between 5 and 30 vol%, were prepared from dense (50 vol% solids) aqueous suspensions by colloidal filtration. A systematic SEM study of the dispersion of particles showed that zirconia provoked the flocculation of powder mixtures. The extent of heteroflocculation appeared to depend upon the amount of zirconia added, and correlated with the properties of dense suspensions (electrophoretic mobility, viscosity, casting constant), as well as with the microstructure and mechanical properties of consolidated bodies. SEM observation of fracture surfaces of green samples revealed the presence of cracklike voids separating the grain clusters. When cast samples were isostatically pressed, a step which should serve to remove the cracklike defects, their mechanical properties changed significantly.