Journal Article

FZJ-2021-03323

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Fracture of Porous Ceramics: Application to the Mechanical Degradation of Solid Oxide Cell During Redox Cycling

Abaza, A. (Corresponding author) ; Meille, S. ; Nakajo, A. ; Leguillon, D. ; Hubert, M.Extern* ; Lenser, C.FZJ* ; Laurencin, J.

2021
Pennington, NJ

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Please use a persistent id in citations: http://hdl.handle.net/2128/30330  doi:10.1149/10301.1151ecst

Abstract: A model based on the Phase Field approach has been developed to simulate the local fracture in porous electrode microstructures. The model capacity to predict the crack nucleation and propagation has been studied with theoretical considerations. For the model validation, micro-compression tests have been performed on porous YSZ micro-pillars. As expected, the compressive fracture strength has been found to decrease with the material porosity. Moreover, a transition in fracture mode has been detected from a brittle behavior toward a local damage when increasing the porosity. It has been shown that the model is able to reproduce correctly the experimental results. The validated model has been used to simulate the fracture of the YSZ backbone induced by the Ni re-oxidation in a typical Ni-YSZ cermet. The generation and localization of the micro-cracks have been discussed according to the degree of Ni re-oxidation and the local morphology of the electrode microstructure.

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Contributing Institute(s):

1. Werkstoffsynthese und Herstellungsverfahren (IEK-1)

Research Program(s):

1. 1231 - Electrochemistry for Hydrogen (POF4-123) (POF4-123)
2. Development of improved anodes in solid oxide fuel cells for conversion of synthesis gas from thermo-chemical gasification of biomass (275388933) (275388933)
3. SOFC - Solid Oxide Fuel Cell (SOFC-20140602) (SOFC-20140602)

Appears in the scientific report 2021

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Database coverage:
; ; SCOPUS

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