Chapter 24. Sinter-Plus-Hiping of Zirconia and Zirconia-Toughened Alumina (ZTA) Ceramic Matrix Composites

  1. J. P. Singh
  1. A. G. Solomah

Published Online: 26 MAR 2008

DOI: 10.1002/9780470294437.ch24

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

Solomah, A. G. (1997) Sinter-Plus-Hiping of Zirconia and Zirconia-Toughened Alumina (ZTA) Ceramic Matrix Composites, 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.ch24

Author Information

  1. SAC International Ceramics. 61–5359 Timberlea Blvd., Mississauga, Ontario Canada

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:

  • ceramic matrix composites;
  • zirconia;
  • alumina;
  • high-temperature annealing;
  • cubic phase

Summary

Yttria-tetragonal zirconia polycrystals (Y-TZP), and yttria-partially stabilized zirconia composites containing different weight percentages of aluminum oxide (Zirconia-Toughened Alumina (ZTA)) were successfully post-sintering hot-isostatically pressed (Sinter-plus-HIPed) to their theoretical density, i.e. > 99.5% TD. Hiping has no measurable effects on hardness (H) and fracture toughness (KIc) properties, as they were determined using Vicker's micro-indentation technique. No phase changes in the crystallinity of these oxide ceramic composites, due to hiping, were observed. Low temperature annealing, i.e., < = 573 K, in a humid atmosphere has caused severe degradation of as-sintered, as well as, the sinter-plus-hiped Y-TZP ceramics. The alumina-containing Y-PSZ composites have shown an excellent resistance to low-temperature annealing. High-temperature annealing, i.e., 1573 K in air atmosphere, had insignificant effects on H and KIc of Y-TZP, while about 10% decrease in the KIc value of Y-PSZ/alumina composites was observed due to the increase in the mole fraction of the cubic phase of zirconia with consistent decrease in the fraction of the tetragonal phase, as it has been determined by quantitative phase analyses using x-ray diffractometry.