Effect of spherical porosity on co-fired dense/porous zirconia bi-layers cambering

Francesca Teocoli*, Debora Marani, Wolff-Ragnar Kiebach, Vincenzo Esposito

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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% 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.
Original languageEnglish
JournalJournal of the European Ceramic Society
Volume38
Issue number1
Pages (from-to)173-179
ISSN0955-2219
DOIs
Publication statusPublished - 2018

Keywords

  • Zirconia
  • Sintering
  • Interface
  • Porosity
  • SOFC

Cite this

@article{71e8fa27c7a147df88a3906fd425c79d,
title = "Effect of spherical porosity on co-fired dense/porous zirconia bi-layers cambering",
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{\%} 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.",
keywords = "Zirconia, Sintering, Interface, Porosity, SOFC",
author = "Francesca Teocoli and Debora Marani and Wolff-Ragnar Kiebach and Vincenzo Esposito",
year = "2018",
doi = "10.1016/j.jeurceramsoc.2017.08.039",
language = "English",
volume = "38",
pages = "173--179",
journal = "Journal of the European Ceramic Society",
issn = "0955-2219",
publisher = "Elsevier",
number = "1",

}

Effect of spherical porosity on co-fired dense/porous zirconia bi-layers cambering. / Teocoli, Francesca; Marani, Debora; Kiebach, Wolff-Ragnar; Esposito, Vincenzo.

In: Journal of the European Ceramic Society, Vol. 38, No. 1, 2018, p. 173-179.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Effect of spherical porosity on co-fired dense/porous zirconia bi-layers cambering

AU - Teocoli, Francesca

AU - Marani, Debora

AU - Kiebach, Wolff-Ragnar

AU - Esposito, Vincenzo

PY - 2018

Y1 - 2018

N2 - 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.

AB - 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.

KW - Zirconia

KW - Sintering

KW - Interface

KW - Porosity

KW - SOFC

U2 - 10.1016/j.jeurceramsoc.2017.08.039

DO - 10.1016/j.jeurceramsoc.2017.08.039

M3 - Journal article

VL - 38

SP - 173

EP - 179

JO - Journal of the European Ceramic Society

JF - Journal of the European Ceramic Society

SN - 0955-2219

IS - 1

ER -