 |
Work Package Objectives
In the simulation of the SOFC system on stack level in WP4, it is unfeasible to describe geometric features below approximately 1 mm with the computational power currently available. This WP will bridge the gap between the richly geometrically featured inside of a stack and the continuum mechanics based stack models. This gap will be filled by using a combination of experiments and multi-scale modeling concepts with the help of micro-mechanical models.
The experiments at operational conditions will ensure that the current material system is well characterized and reliable stack models can be established. The experiments do, however, only provide limited knowledge about how the geometrical features can be optimized. Thus, in order to fulfill the project objective of process optimization, deeper knowledge of the material behavior is investigated on through micro-mechanical models. It is for instance an objective to better understand the failures of porous ceramic-metallic components under multi-axial states of stress.
Specific Challenge
A number of mechanical measurements have already been performed on SOFCs, but the literature is very scarce on high temperature measurement with an appropriate number of specimens needed for statistical purposes. Furthermore, the different material properties have been measured on different types of cells or different productions concerning the inconsistency of data. The challenge of this work package is to obtain a consistent and reliable set of material data for the stack models of the project (WP4).
Also the existing knowledge about the mechanical performance of the SOFC is almost completely on the macro-scale. In order to understand the failure of the porous ceramics and in turn optimize these, the investigations of the materials must move to a micro-structural level. In this project novel micro-structural studies will be performed to get a deeper insight into the mechanical performance of the SOFC.
Further Reading
H. L. Frandsen, D. J. Curran, S. Rasmussen, P. V. Hendriksen, “High throughput measurement of high temperature strength of ceramics in controlled atmosphere and its use on SOFC anode supports”, J. Power Sources 258 (2014) 195-203
R. Clague, P. R. Shearing, P. D. Lee, Z. Zhang, D. J. L. Brett, A. J. Marquis and N. P. Brandon (2011), "Stress analysis of solid oxide fuel cell anode microstructure reconstructed from focused ion beam tomography", J. Power Sources 196 [21] 9018-9021.
G. Delette J. Laurencin F. Usseglio-Viretta J. Villanova P. Bleuet E. Lay-Grindler T. Le Bihan, " Thermo-elastic properties of SOFC/SOEC electrode materials determined from three-dimensional microstructural reconstructions”, Int J Hydrogen Energ
Work Package Leader:
Organisation: Technical University of Denmark
Name: Henrik Lund Frandsen