Effect of spherical porosity on co-fired dense/porous zirconia bi-layers cambering. Issue 1 (January 2018)

• Record Type: Journal Article
• Authors: Teocoli, Francesca; Marani, Debora; Kiebach, Ragnar; Esposito, Vincenzo
• Is Part Of: Journal of the European Ceramic Society. Volume 38:Issue 1(2018)
• Page Start: 173
• Page End: 179
• Publication Date: 2018-01
• Subjects: Zirconia -- Sintering -- Interface -- Porosity -- SOFC; Ceramic materials -- Periodicals; Composite materials -- Periodicals; Matériaux céramiques -- Périodiques; Composites -- Périodiques; Ceramic materials; Composite materials; Periodicals; Electronic journals; 666.05
• DOI: 10.1016/j.jeurceramsoc.2017.08.039
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: Geometrical instability leading to cambering is recorded during co-sintering of zirconia dense/porous bi-layered planar structures. Sintering strain in the bi-layers rises mainly from mismatch between the different porosity volume fractions at the layers and their interface. In this paper, we analyze the model case of dense taped of 8 mol% Y2 O3 -stabilized ZrO2 laminated on ca. 400 μ thick 3 mol% Y2 O3 doped zirconia porous tapes, with homogenous spherical porosity of 13 vol%, 46 vol%, and 54 vol%. Sintering stress during densification is evaluated from the shrinkage rates and viscoelastic behavior during sintering by thermo-mechanical analysis, using cyclic loading dilatometry. The camber development of the bi-layers is measured by in-situ optical dilatometry. In accordance with the model prediction, cambering can be controlled tuning the porosity while achieving a synergetic effect between densification and formation of open porosity at the bilayers.