Elasticity and strength of partially sintered ceramics

Liu, Xiaoxing; Martín, Christophe; Delette, G.; Bouvard, D.

doi:10.1016/j.jmps.2010.04.007

Cited by 40 publications

(53 citation statements)

References 33 publications

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“…To have a better understanding of the influence of the solid phase (respectively the porosity) morphology, on the mechanical properties, a quantitative study has to be carried out. The use of 3D volumes from x-ray computed tomography, coupled with a finite elements simulation [171] or with discrete element modeling [172] are powerful approaches.…”

Section: Discussionmentioning

confidence: 99%

A meta-analysis of the mechanical properties of ice-templated ceramics and metals

Deville

Meille

Seuba

2015

Science and Technology of Advanced Materials

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Ice templating, also known as freeze casting, is a popular shaping route for macroporous materials. Over the past 15 years, it has been widely applied to various classes of materials, and in particular ceramics. Many formulation and process parameters, often interdependent, affect the outcome. It is thus difficult to understand the various relationships between these parameters from isolated studies where only a few of these parameters have been investigated. We report here the results of a meta analysis of the structural and mechanical properties of ice templated materials from an exhaustive collection of records. We use these results to identify which parameters are the most critical to control the structure and properties, and to derive guidelines for optimizing the mechanical response of ice templated materials. We hope these results will be a helpful guide to anyone interested in such materials.

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Section: Discussionmentioning

confidence: 99%

A meta-analysis of the mechanical properties of ice-templated ceramics and metals

Deville

Meille

Seuba

2015

Science and Technology of Advanced Materials

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“…However, microstructural design approaches to optimize multiple properties, have yet to be developed. Enhancements to material performance are often realized by indiscriminately increasing the porosity, typically resulting in decreased mechanical performance . Studies have shown, however, that by optimizing porous architecture, both functional and mechanical performance may be simultaneously improved .…”

Section: Introductionmentioning

confidence: 99%

Effect of Macropore Anisotropy on the Mechanical Response of Hierarchically Porous Ceramics

et al. 2015

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International audiencePorous ceramics are commonly used in electrochemical, catalytic, biological, and filtration processes, but in many cases, improvements to their designed performance come at the expense of their mechanical properties. By controlling the pore morphology and orientation, it is possible to mitigate some mechanical losses while maintaining adequately porous microstructures. Hierarchically, porous ceramics with similar porosities but differing macropore arrangements were synthesized using both freeze casting and slip casting, and then tested in compression to study the effects of macropore morphology and orientation on mechanical behavior. The mechanical properties of the anisotropic structures were a strong function of the orientation of the macropores relative to the applied stress. The properties of the isotropic hierarchical porous structures were in between the two orthotropic directions of the anisotropic porous ceramics. For the freeze-cast samples, the compressive strength was a function of the macropore size. The experimental results are rationalized using detailed microstructural analysis

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“…Mori et al [19] and Sun et al [20] report a shrinkage of the Ni-yttria stabilised zirconia (YSZ) anode during thermal cycling. Discrete element modelling [21] is a means to clarify the mechanisms. Anandakumar et al [22] have investigated the beneficial use of graded materials on the risk of cell failure.…”

Section: Introductionmentioning

confidence: 99%

Mechanical reliability and durability of SOFC stacks. Part II: Modelling of mechanical failures during ageing and cycling

Nakajo

Mueller

Brouwer

et al. 2012

International Journal of Hydrogen Energy

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Creep Contact analysis a b s t r a c tIntricate relationships between mechanical and electrochemical degradation aspects likely affect the durability of solid oxide fuel cell stacks. This study presents a modelling framework that combines thermo-electrochemical models including degradation and a contact thermo-mechanical model that considers rate-independent plasticity and creep of the components materials and the shrinkage of the nickel-based anode during thermal IntroductionThe end of operation of a solid oxide fuel cell (SOFC) stack ultimately occurs due to the loss of structural integrity of one or several of the cells, as highlighted by several short-stack experiments, e.g [1e4]. We believe this is the result of the accumulation during operation, of physico-chemical alterations inducing a weakening of the materials and interfaces, of plastic and creep deformations, and of the modification of the temperature profile, due to the degradation of the electrochemical performance of the cells. Mechanical issues do not, however, exclusively occur after prolonged use. Inappropriate control during start-up and shut-down and/or following of the electrical power demand, harsh characterisation procedures and thermal cycling can induce discrete failures [5,6]. Despite the evidence of mechanical issues in SOFCs, which are experienced even during laboratory button cell tests, this topic is still receiving limited attention. Efforts are seen as standalone tasks, owing to the different experimental and modelling techniques that are required to gather the essential information, whereas mechanical failures in SOFCs are likely intricately related to chemical and electrochemical aspects.The central component in a stack is the membrane electrode assembly (MEA). As for any multilayered system made of brittle materials, the MEA is prone to failures related to residual * Corresponding author. Tel.: þ41 21 693 35 05.E-mail address: arata.nakajo@epfl.ch (A. Nakajo).Available online at www.sciencedirect.com journal h om epa ge: www.elsev ier.com/locate/he i n t e r n a t i o n a l j o u r n a l o f h y d r o g e n e n e r g y 3 7 ( 2 0 1 2 ) 9 2 6 9 e9 2 8 6

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Elasticity and strength of partially sintered ceramics

Cited by 40 publications

References 33 publications

A meta-analysis of the mechanical properties of ice-templated ceramics and metals

A meta-analysis of the mechanical properties of ice-templated ceramics and metals

Effect of Macropore Anisotropy on the Mechanical Response of Hierarchically Porous Ceramics

Mechanical reliability and durability of SOFC stacks. Part II: Modelling of mechanical failures during ageing and cycling

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