Towards the prediction of hydrothermal ageing of 3Y-TZP bioceramics from processing parameters

Chong Wei (1) , Laurent Gremillard (1)

1 MATEIS - Matériaux, ingénierie et science [Villeurbanne]

Hydrothermal ageing of yttria-stabilized tetragonal zirconia ceramics can have a strong influence on the lifetime of zirconia devices. Ageing kinetics are often described by the Mehl-Avrami-Johnson equation, most often used as a phenomenological description. This work seeks to relate the parameters of MAJ equations (V max , n, b 0 and Q) to microstructural characteristics of the zirconia material: grain sizes, Y 2 O 3 partitioning, monoclinic, tetragonal and cubic phases ratio. Samples with identical nominal composition of 3Y-TZP were prepared with grain sizes ranging from 190 nm to 773 nm. From their microstructural parameters, a relationship between microstructural parameters and sintering cycles was first proposed, followed by a relationship between ageing parameters and microstructural parameters. These results provide a convenient framework to better develop the sintering cycle of zirconia biomaterial in order to maximize their resistance to hydrothermal ageing.

Domaines: Matériaux

Chong Wei, Laurent Gremillard. Towards the prediction of hydrothermal ageing of 3Y-TZP bioceramics from processing parameters. Acta Materialia, 2018, 144, pp.245 - 256. ⟨10.1016/j.actamat.2017.10.061⟩. ⟨hal-01758663⟩