Chapter 39. Effects of the Interfaces Between Flocs in Wet Processed Zirconia-Alumina on the Mechanical Properties of Smtered Composites.

  1. John B. Wachtman Jr.
  1. K. J. Konsztowicz1 and
  2. R. Langlois2

Published Online: 26 MAR 2008

DOI: 10.1002/9780470313978.ch39

Proceedings of the 16th Annual Conference on Composites and Advanced Ceramic Materials, Part 2 of 2: Ceramic Engineering and Science Proceedings, Volume 13, Issue 9/10

Proceedings of the 16th Annual Conference on Composites and Advanced Ceramic Materials, Part 2 of 2: Ceramic Engineering and Science Proceedings, Volume 13, Issue 9/10

How to Cite

Konsztowicz, K. J. and Langlois, R. (1994) Effects of the Interfaces Between Flocs in Wet Processed Zirconia-Alumina on the Mechanical Properties of Smtered Composites., in Proceedings of the 16th Annual Conference on Composites and Advanced Ceramic Materials, Part 2 of 2: Ceramic Engineering and Science Proceedings, Volume 13, Issue 9/10 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470313978.ch39

Author Information

  1. 1

    ARL-National Research Council, Halifax, NS B3H 321

  2. 2

    IMI-National Research Council, Boucherville, QC J4B 6Y4 Canada

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1994

ISBN Information

Print ISBN: 9780470375198

Online ISBN: 9780470313978

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Keywords:

  • microstructual;
  • nano-sized dispersions;
  • structural materials;
  • composites;
  • atmosphere

Summary

Dense aqueous suspensions (51 vol% solids) of zirconia-alumina were prepared, the content of 3Y-TZ varying from 5 to 30 vol %. Samples were slip cast, and then half of them were additionally isostatically pressed. After sintering in air, there was no difference in strength between “cast-only” and “cast-then-isopressed” composites. However, the fracture toughness of cast-only samples increased significantly with Zr02 content, whereas the toughness of samples isopressed after casting remained independent of zirconia content. This suggests that impressing causes the closure of interfaces between grain flocs and thus prevents formation of “weak boundaries” upon sintering. Such weak boundaries facilitate microcrack formation due to residual stresses, and provide the only toughening mechanism in ZTA composites with non-transforming Zr02.