Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7974880 | Materials Science and Engineering: A | 2016 | 5 Pages |
Abstract
The aim of this study was to understand the phase transformation in yttria-stabilized tetragonal zirconia (Y-TZP) dental ceramic and its effect on slow crack growth (SCG) behavior in oral environment. The SCG behavior of Y-TZP dental ceramic was investigated in air and in water at 37 °C by static fatigue testing on pre-cracked specimens. Additionally, Confocal Raman spectroscopy has been used for the quantitative assessments of phase transformation zones at the crack tip. Environmental metastability of Y-TZP dental ceramic took place a stress/water induced tetragonal - to - monoclinic (tâm) phase transformation and proceed with time. The SCG behavior in water at 37 °C is a result of cracking through a zone of monoclinic material ahead of the crack tip. The crack growth rate is proportional to the probability of successful completion of water/stress induced tâm phase transformation. The Raman spectroscopic assessment provides a new angle of view in understanding the SCG behavior of zirconia dental ceramics in different environments.
Related Topics
Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
Jingya Gui, Zhipeng Xie,