Structural stability of zirconia ceramic in water and acid solutions
|Mariusz Andrzejczuk 1, Malgorzata Lewandowska 1, Tomaz Kosmac 2, Krzysztof J. Kurzydlowski 1|
1. Warsaw University of Technology, Faculty of Materials Science and Engineering (InMat), Wołoska 141, Warszawa 02-507, Poland
Yttria-tetragonal zirconia is used as biomaterial for dental applications e.g. inlays, crowns, bridges. Since Y-TZP may undergo phase transformation, which can results in micro-cracking, structural stability in oral environment is of great importance.
The results showed that specimens sintered at higher temperature (1450o-1500oC) to a fractional density above 95% of the theoretical exhibit low tetragonal to monoclinic phase transformation upon autoclaving in water at 200oC for 24 hours. The volume expansion due to phase transformation created micro cracks, which reduced flexural strength. The effect of environment pH on phase transformation is also discussed.
Presentation: Poster at E-MRS Fall Meeting 2006, Symposium I, by Mariusz Andrzejczuk
See On-line Journal of E-MRS Fall Meeting 2006
Submitted: 2006-05-11 10:26 Revised: 2009-06-07 00:44