Chapter 8. The Mechanical Properties and Hydrothermal Stability of Porous, Partially (Biscuit-) Sintered Y-TZP Ceramics

  1. Rajan Tandon,
  2. Andrew Wereszczak and
  3. Edgar Lara-Curzio
  1. Tomaz Kosmac1,
  2. Mariusz Andrzejczuk2 and
  3. Krzysztof J Kurzydlowski2

Published Online: 27 MAR 2008

DOI: 10.1002/9780470291313.ch8

Mechanical Properties and Performance of Engineering Ceramics II: Ceramic Engineering and Science Proceedings, Volume 27, Issue 2

Mechanical Properties and Performance of Engineering Ceramics II: Ceramic Engineering and Science Proceedings, Volume 27, Issue 2

How to Cite

Kosmac, T., Andrzejczuk, M. and Kurzydlowski, K. J. (2006) The Mechanical Properties and Hydrothermal Stability of Porous, Partially (Biscuit-) Sintered Y-TZP Ceramics, in Mechanical Properties and Performance of Engineering Ceramics II: Ceramic Engineering and Science Proceedings, Volume 27, Issue 2 (eds R. Tandon, A. Wereszczak and E. Lara-Curzio), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470291313.ch8

Author Information

  1. 1

    Ceramics Department Jozef Stefan Institute Jamova 39, 1000 Ljubljana, Slovenia

  2. 2

    Faculty of Materials Science and Engineering Warsaw University of Technology 141 Woloska Str. 02–507 Warsaw, Poland

Publication History

  1. Published Online: 27 MAR 2008
  2. Published Print: 1 JAN 2006

ISBN Information

Print ISBN: 9780470080528

Online ISBN: 9780470291313

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Keywords:

  • agglomeration;
  • mechanical properties;
  • degradation;
  • hydrothermal;
  • Y-TZP

Summary

Porous 3 Y–TZP ceramics with a fractional density covering a wide range, from <60% to >95%, were produced by biscuit–sintering dry–pressed pellets at different temperatures in an ambient air atmosphere. Other processing variables were the specific surface area of the starting powders and the compaction pressure. After sintering, the materials were verified for biaxial flexural strength, grinding–induced transformability and hydrothermal stability.

The flexural strength of the porous, biscuit–sintered Y–TZP ceramics progressively increased with the fractional density, starting from 150–200 MPa at 55–60 % theoretical density (TD), and reaching values exceeding 800 MPa at 90–94 % TD, i.e., before the porosity becomes closed and the grains start to grow more intensively. The XRD patterns of the ground surfaces revealed that a reverse transformation had taken place during the grinding of the ceramics sintered to a fractional density exceeding 75–80 % TD, which also indicates that these ceramics already experience transformation toughening. All the specimens sintered to a fractional density of less than 94–96 % TD exhibited full hydrothermal stability upon autoclaving in water at 200°C for 24 hours.