Elastic properties of multi‐layered ceramic systems for SOCs

Abstract

SOCs (Solid Oxide Cells) operate in harsh conditions and have to withstand considerable static and cyclic stresses, both mechanical and thermal. Thus, their mechanical stability is threatened. One fundamental aspect is the structural integrity of the cell. In fact, mechanical failure of a single cell can damage the whole stack, reducing the lifetime and the efficiency of the entire system. This study focuses on the ceramic layered structure of an Yttria-stabilized electrolyte supported cell. Its elastic modulus has been measured through destructive and nondestructive techniques (three-point bending test, impulse excitation technique, tensile test). Many literature sources deal with properties of the most common electrolytes and electrodes, yet co-sintering effects and interactions between layers are still not fully comprehended. In this contribution the overall elastic performance of the cell has been investigated, focusing on the role that the interface between layers plays in the changing of resulting mechanical properties. To enable this investigation, layers were added to the electrolyte one by one, thus allowing individual interactions to be distinguished with the help of numerical simulations. Results obtained for consecutive samples through different techniques have been compared and discussed. K E Y W O R D S elastic constants, finite element analysis, fuel cells, layered ceramics

Electrolyte-Supported Fuel Cell: Co-Sintering Effects of Layer Deposition on Biaxial Strength

“…Material data used for the simulations are reported in Table 3. Elastic modulus E, Poisson’s ratios ν, and densities ρ were taken from Reference [4], while coefficients of thermal expansion α were measured via dilatometry or taken from literature [28,29].…”

“…Reversible solid oxide cells (SOCs) are devices able to produce synthetic fuels when operated in electrolysis mode (SOEC) and electricity when operated in fuel cell mode (SOFC). Recently, SOCs have been attracting a lot of interest because of their environmentally-friendly nature, their flexibility with respect to the fuel utilization and energy source integration, their capability and their surprisingly high overall efficiency [1,2,3,4]. They represent a promising tool towards a sustainable future.…”

IETeasy: An open source and low-cost instrument for impulse excitation technique, applied to materials classification by acoustical and mechanical properties assessment.

“…However, even in this field, other expensive complementary techniques had been preferred to IET, such as the ultrasounds analysis, radiography and tomography [8] , which are still the most used non-destructive techniques (NDT) for quality control and certification. In the last years, many notable academic research examples began to spread in the fields of the metallurgy [9] , [10] , [11] , geology [12] and the science of ceramic materials [13] , [14] , [15] . Even if IET data are rich in information content, the main application of the technique consists in the measurement of elastic properties of materials, such as Young’s modulus, shear modulus and Poisson’s coefficient [16] .…”

3D thermo-electro-chemo-mechanical coupled modeling of solid oxide fuel cell with double-sided cathodes

“…In this work, the thermal stress is assumed to be zero at 1023K, accordingly. The parameters used in this mechanical model are given in table 3 [42,43] as: To simulate the SOFC under working conditions, it is necessary to choose proper boundary conditions. In this work, the laminar flow profile is specified at the gas inlet, and the average flow velocities are calculated under different gas flow rates.…”