Mechanical Behaviour of Glassy Composite Seals for IT-SOFC Application.

Agersted, Karsten; Solvang, Mette; Nielsen, Sofie Birkedal Lund; Beeaff, Dustin

doi:10.1002/9780470291337.ch31

Cited by 4 publications

(1 citation statement)

References 9 publications

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“…The measurement of the mechanical properties of the steel/glass-ceramics joints is difficult since the results are highly influenced by the configuration of the test and the size of the samples, in such a way that components of other forces (not only the one subject of the measurement, i.e., additional unwanted bending) can influence the measurement (Nielsen et al, 2008;Smeacetto et al, 2008;Cela Greven, 2014). Although there are many papers in the literature that report on mechanical properties, the comparison of results turns out to be complicated due to this problem.…”

Section: Introductionmentioning

confidence: 99%

Thermo-Mechanical Stability and Gas-Tightness of Glass-Ceramics Joints for SOFC in the System MgO-BaO/SrO-B2O3-SiO2

et al. 2020

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The objective of this paper is to illustrate a variety of studies carried out to improve the quality of some particular glass-ceramic joining materials based on measured properties such as gas-tightness and mechanical resistance and demonstrate the feasibility of using the proposed materials for solid oxide fuel cells (SOFC) and solid oxide electrolysis cells (SOEC) applications. First, the sealing conditions have been optimized for the two selected compositions in the system MgO-BaO/SrO-B 2 O 3 -SiO 2 . Once the joining materials have been optimized, the gas-tightness has been measured as a function of the glass-ceramic crystallization degree, its thermal cycling behavior and the influence of a reducing atmosphere on this property. The electrical resistance at high temperature has also been studied. Subsequently, the chemical compatibility of the joints steel/glass-ceramic has been evaluated by means of the analysis of the cross-sections using SEM and EDX. Furthermore, the mechanical and chemical stability of the joints has also been studied as a function of the crystallization degree, the resistance vs. thermal cycling and the influence of a reducing atmosphere. Finally, the mechanical resistance of the joints regarding flexural loading has been characterized employing a 4-point bending method both at room temperature and at relevant high temperatures varying the seal thickness. Overall, the results verify that the developed and tested materials are promising for long term stable SOFC and SOEC applications in advanced stack designs aiding prolonged lifetime under thermal-cyclic conditions.

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Section: Introductionmentioning

confidence: 99%