Residual stresses in a co-sintered SOC half-cell during post-sintering cooling

Benoit Charlas, Christodoulos Chatzichristodoulou, Karen Brodersen, Kawai Kwok, Poul Norby, Ming Chen, Henrik Lund Frandsen

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Abstract

Due to the thermal expansion mismatch between the layers of a Solid Oxide Cell, residual stresses (thermal stresses) develop during the cooling after sintering. Residual stresses can induce cell curvature for asymmetric cells but more importantly they also result in more fragile cells. Depending on the loading conditions, the additional stress needed to break the cells can indeed be smaller due to the initial thermo-mechanical stress state. The residual stresses can for a bilayer cell be approximated by estimating the temperature at which elastic stresses start to build up during the cooling, i.e. the reference temperature (Tref) or the strain difference based on the curvature. This approximation gives good results for bilayers with a defined cooling temperature profile, where the curvature of the bilayer defines a unique balance between the two unknown residual stress states in the two layers. This methodology is however not valid for more layers, as several configurations of residual stresses in the layers can result in the same curvature. Therefore the development of residual stresses of co-sintered multilayer cells during the cooling after sintering is here studied by a finite element model simulation taking into account the elastic response and creep of each layer. The model is validated by measuring the curvature and residual stresses of multi-layer cells.
Original languageEnglish
Title of host publicationProceedings of 11th European SOFC and SOE Forum 2014
Number of pages11
PublisherEuropean Fuel Cell Forum
Publication date2014
Article numberB1107
ISBN (Electronic)978-3-905592-16-0
Publication statusPublished - 2014
EventEuropean fuel cell 2014 - 11th European SOFC and SOE Forum 2014 - Lucerne, Switzerland
Duration: 1 Jul 20144 Jul 2014

Conference

ConferenceEuropean fuel cell 2014 - 11th European SOFC and SOE Forum 2014
CountrySwitzerland
CityLucerne
Period01/07/201404/07/2014

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