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Lifetime estimation of a zirconia-alumina composite for biomedical applications

TitleLifetime estimation of a zirconia-alumina composite for biomedical applications
Publication TypeArticolo su Rivista peer-reviewed
Year of Publication2014
AuthorsFabbri, Paride, Piconi C., Burresi Emiliano, Magnani G., Mazzanti Francesca, and Mingazzini C.
JournalDental Materials
Volume30
Pagination138-142
ISSN01095641
KeywordsActivation energy, Alumina, Alumina-zirconia composites, aluminum oxide, Arrhenius plots, chemistry, electron, Hydrothermal stabilities, Kinetics, Lifetime prediction, Low-temperature degradations, Medical applications, Microscopy, Nucleation and growth model, Scanning, Scanning electron microscopy, Tetragonal-to-monoclinic transformation, X ray diffraction, X-Ray Diffraction, Zirconia, Zirconia toughened alumina, Zirconia-alumina composites, zirconium, zirconium oxide
Abstract

Objectives In this work long term stability of a zirconia toughened alumina (ZTA) composite was investigated. Methods Accelerated aging tests under hydrothermal environment, in autoclave and hot water, at different temperature, was conducted on material sample. Tetragonal to monoclinic transformation was evaluated by XRD analysis and the monoclinic content was plot as a function of the exposure time. The kinetic of transformation was studied by means Mehl-Avrami-Johnson (MAJ) nucleation and growth model. Results An activation energy for tetragonal to monoclinic transformation of 99 kJ/mol was found by the Arrhenius plot of reaction rate, value in agreement with other bibliography works regarding Y-TZP and alumina-zirconia composites. The in vivo hydrothermal stability simulation, estimated by the obtained activation energy, predicts in 65 years the time necessary to reach 25 vol% of monoclinic phase. Significance These results support the material suitability in biomedical field, especially in dentistry applications as implantology. © 2013 Academy of Dental Materials.

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URLhttps://www.scopus.com/inward/record.uri?eid=2-s2.0-84892675119&doi=10.1016%2fj.dental.2013.10.006&partnerID=40&md5=b47129f239c4ccef6d1d77014a97c6ad
DOI10.1016/j.dental.2013.10.006
Citation KeyFabbri2014138