Effect of low-temperature aging on the mechanical behavior of ground Y-TZP

G. K.R. Pereira, M. Amaral, P. F. Cesar, M. C. Bottino, C. J. Kleverlaan, L. F. Valandro

Research output: Contribution to journalArticle

38 Scopus citations

Abstract

This study evaluated the effects of low-temperature aging on the surface topography, phase transformation, biaxial flexural strength, and structural reliability of a ground Y-TZP ceramic. Disc-shaped specimens were manufactured and divided according to two factors: "grinding" - without grinding (as-sintered, Ctrl), grinding with an extra-fine diamond bur (25 μm Xfine) and coarse diamond bur (181 μm Coarse); and "low-temperature-aging" (absence or presence). Grinding was performed using a contra-angle handpiece under water-cooling. Aging was performed in an autoclave at 134 °C, under 2 bar, over a period of 20 h. Surface topography analysis showed an increase in roughness based on grit-size (Coarse>Xfine>Ctrl), and aging promoted different effects on roughness (Ctrl Ag<Ctrl; Xfine Ag<Xfine Coarse Ag>Coarse). Grinding and aging promoted an increase in the amount of m-phase, although different susceptibilities to degradation were observed. Weibull analysis showed an increase in characteristic strength after grinding (Coarse=Xfine>Ctrl); however, distinct effects were observed for aging (Ctrl<Ctrl Ag; Xfine=Xfine Ag; Coarse>Coarse Ag). Weibull moduli were statistically similar. Grinding promoted an increase in characteristic strength as a result of an increase in m-phase content; when the Y-TZP surface was ground by coarse diamond burs followed by aging, characteristic strength was reduced, meaning the low-temperature degradation appeared to intensify for rougher Y-TZP surfaces.

Original languageEnglish (US)
Pages (from-to)183-192
Number of pages10
JournalJournal of the Mechanical Behavior of Biomedical Materials
Volume45
DOIs
StatePublished - May 1 2015

Keywords

  • Grinding
  • Hydrothermal aging
  • Low-temperature degradation
  • Mechanical properties
  • Phase transformation
  • Structural reliability
  • Zirconium oxide partially stabilized by yttrium

ASJC Scopus subject areas

  • Biomaterials
  • Biomedical Engineering
  • Mechanics of Materials

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    Pereira, G. K. R., Amaral, M., Cesar, P. F., Bottino, M. C., Kleverlaan, C. J., & Valandro, L. F. (2015). Effect of low-temperature aging on the mechanical behavior of ground Y-TZP. Journal of the Mechanical Behavior of Biomedical Materials, 45, 183-192. https://doi.org/10.1016/j.jmbbm.2014.12.009