Abstract
The flexural strength and fracture toughness of 2.8 mol% Y 2 O 3 -stabilized zirconia polycrystals were investigated. The polycrystals were fabricated by sintering powders prepared by two different methods; the solid phase method (SPM), which involved wet dispersing and mixing using an agitator mill, and the liquid phase precipitation method (LPM). In the case of the LPM sample, the compressive residual stress on the polished surface was lower than of the SPM sample and did not depend on the grain size, while the monoclinic phase fraction on the fracture surface increased with an increase in the grain size. By contrast, for the SPM sample, the compressive residual stress depended on the grain size, and the monoclinic phase fraction on the fracture surface revealed the tendency to decrease with an increase in the grain size. The flexural strength and fracture toughness of the LPM sample were greatly influenced by the stress-induced transformation. However, mechanical properties and transformation behavior of the SPM sample in relation to grain size implied that the SPM sample was dominated not only by the stress-induced transformation but also by the compressive residual stress and the microcracks generated by the transformation. For both SPM and LPM samples, the relationship between the transformed volume V f √h, where V f is the tetragonal phase fraction and h is the transformed depth, and the fracture toughness was linear. The fracture toughness for the SPM sample was more strongly influenced by V f √h than that of the LPM sample.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.