Sintering of Multilayered Porous Structures: Part I‐Constitutive Models

Olevsky, Eugene A.; Molla, Tesfaye Tadesse; Frandsen, Henrik Lund; Bjørk, Rasmus; Esposito, Vincenzo; Ni, De Wei; Ilyina, A. M.; Pryds, Nini

doi:10.1111/jace.12375

Cited by 32 publications

(40 citation statements)

References 33 publications

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“…If there was no effect of gravity on the development of the distortions, all the three bilayer systems should have shown the same evolutions of curvatures. This is because the internal stresses balance over the thickness of the layers which makes the curvature to be affected only by the thicknesses in addition to the material properties . However, it is observed that the curvature varies depending on the length of the samples where less curvature is shown as the length of the sample increases because of gravity.…”

Section: Resultsmentioning

confidence: 99%

“…Sometimes the viscous parameters of the porous body are measured and reported in terms of the uniaxial viscosity, η u , and viscous Poisson's ratio,ν v , as:

{normalη}_{normalu} = \frac{18 {normalη}_{0} ψ φ}{6 ψ + φ} and {normalν}_{normalv} = \frac{3 ψ - φ}{6 ψ + φ}

…”

Section: Model Developmentmentioning

confidence: 99%

“…However, camber evolution is also affected by geometrical parameters such as the ratio of layers’ thickness and length of the sample . Furthermore, additional factors like own weight of the sample (gravity) and friction (between the edges of the bilayer and the surface of the sample support while the bi‐layer deforms) have often significant effect on the overall distortion of the sample …”

Section: Introductionmentioning

confidence: 99%

“…With regards to the effect of geometrical parameters, methodical studies describing the effect of the thickness ratio of layers on the camber evolution have been previously reported . Olevsky et al .…”

Section: Introductionmentioning

confidence: 99%

“…Olevsky et al . also discussed how the initial porosity of each layer making the bi‐layer could also be used to optimize the camber evolution during cofiring . On the other hand, Mücke et al .…”

Section: Introductionmentioning

confidence: 99%

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Finite Element Modeling of Camber Evolution During Sintering of Bilayer Structures

Molla

Bulatova

et al. 2014

J. Am. Ceram. Soc.

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The need for understanding the mechanisms and optimization of shape distortions during sintering of bilayers is necessary while producing structures with functionally graded architectures. A finite element model based on the continuum theory of sintering was developed to understand the camber developments during sintering of bilayers composed of La0.85Sr0.15MnO3 and Ce0.9Gd0.1O1.95 tapes. Free shrinkage kinetics of both tapes were used to estimate the parameters necessary for the finite element models. Systematic investigations of the factors affecting the kinetics of distortions such as gravity and friction as well as the initial geometric parameters of the bilayers were made using optical dilatometry experiments and the model. The developed models were able to capture the observed behaviors of the bilayers’ distortions during sintering. Finally, we present the importance of understanding and hence making use of the effect of gravity and friction to minimize the shape distortions during sintering of bilayers.

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Section: Resultsmentioning

confidence: 99%

“…Sometimes the viscous parameters of the porous body are measured and reported in terms of the uniaxial viscosity, η u , and viscous Poisson's ratio,ν v , as: