Chapter 8. The Mechanical Properties and Hydrothermal Stability of Porous, Partially (Biscuit-) Sintered Y-TZP Ceramics
- Rajan Tandon,
- Andrew Wereszczak and
- Edgar Lara-Curzio
Published Online: 27 MAR 2008
Copyright © 2007 The American Ceramics Society
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
- Published Online: 27 MAR 2008
- Published Print: 1 JAN 2006
Print ISBN: 9780470080528
Online ISBN: 9780470291313
- mechanical properties;
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.