Journal article
Effect of spherical porosity on co-fired dense/porous zirconia bi-layers cambering
Department of Energy Conversion and Storage, Technical University of Denmark1
Ceramic Engineering & Science, Department of Energy Conversion and Storage, Technical University of Denmark2
Universidade Federal do ABC3
Mixed Conductors, Department of Energy Conversion and Storage, Technical University of Denmark4
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% Y2O3-stabilized ZrO2 laminated on ca. 400 μ thick 3 mol% Y2O3 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.
Language: | English |
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Year: | 2018 |
Pages: | 173-179 |
ISSN: | 1873619x and 09552219 |
Types: | Journal article |
DOI: | 10.1016/j.jeurceramsoc.2017.08.039 |
ORCIDs: | Teocoli, Francesca , Kiebach, Wolff-Ragnar and Esposito, Vincenzo |