Alumina-toughened zirconia nanocomposite: Aging effect on microstructural, optical, and mechanical properties

Piza, Mariana M.T.; Bergamo, Edmara T.P.; Campos, Tiago M.B.; Carvalho, Laura F.; Goulart, Celso A.; Gutierres, Eliezer; Lopes, Adolfo C.O.; Benalcazar Jalkh, Ernesto B.; Bonfante, Estevam A.

doi:10.1016/j.dental.2023.09.005

Cited by 2 publications

(1 citation statement)

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“…Nonetheless, the minimum biax- ial flexural strength result is still higher than the maximum values from the other groups of 1 155 and 1 420 MPa for CS and NNHYD, respectively. The volume expansion generated by the forced 𝑡→𝑚 transformation in the artificial aging leads to a surface toughening effect, which is beneficial for CS 3Y-TZP 44 in experimental conditions, as indicated by the increase in characteristic strength for the aged CS group, with no significant impact on the Weibull modulus. On the other hand, this effect can be detrimental to nanostructured Y-TZP materials 29 since the amount of the monoclinic phase formed is more restricted to the near-surface region (Figure 4), which can cause microcracking due to the excessive stresses localized in a smaller volume.…”

Section: Resultsmentioning

confidence: 99%

Cyclic fatigue behavior of Y‐TZP nanostructures with non‐homogeneous yttria distribution

Goulart,

Piza,

Carvalho

et al. 2024

J Am Ceram Soc.

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Nanostructured Y‐TZP samples with Non‐Homogeneous Yttria Distribution (NNHYD) were prepared by mixing co‐precipitated 3Y‐TZP powder (Tosoh TZ‐3Y) with yttria‐free monoclinic powder (Tosoh TZ‐0), yielding an overall yttria content of 2 mol%. The cyclic fatigue behavior of NNHYD was evaluated by Step‐Stress Accelerated Life Testing (SSALT) and mechanical cycling in a biaxial flexural strength test (BFST) setup and compared to Conventional Submicrometric 3Y‐TZP (CS). Physical, structural, microstructural, and mechanical characterizations of all groups were also evaluated and compared before and after artificial aging in autoclave. NNHYD presented a higher capacity for damage accumulation and maintenance of phase transformation potential than CS, associated with elevated resistance to the propagation of Low‐Temperature Degradation (LTD). A nanostructured 3Y‐TZP surface layer introduced in NNHYD by dip coating (DC‐NNHYD) improved resistance to LTD at the cost of reduced reliability under cyclic fatigue by increasing the stability of the tetragonal phase. This surface alteration highlights the impact of surface properties on mechanical performance. The results of this study present practical possibilities to help achieve the ideal balance between strength, toughness, and LTD resistance to improve the lifetime of zirconia‐based biomaterials.

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Section: Resultsmentioning

confidence: 99%