X-ray Computed Microtomography of Porous Ceramics: Models for SOFC Anode Supports. Monica Olvera, Northwestern University, DMR 0520513. 112 μ m. 84. 56. 28. 4. 3. 2. 1.
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Monica Olvera, Northwestern University, DMR 0520513
Porosity in the substrate of an anode-supported solid oxide fuel cell (SOFC) must be tailored to maximize fuel flow to and byproduct flow away from the active region of the cell. A 3-D analysis of pore networks in aluminum oxide samples, produced using the same thermoreversible gelcasting technique as used for SOFC supports, has been carried out by NU-MRSEC researchers. X-ray computed microtomography (XCT) has been performed in conjunction with researchers at the Advanced Photon Source of Argonne National Laboratory. Image analysis allows for the visualization of the 3-D pore networks (view 1), which can be modeled as nodes joined by tortuous pathways (views 2 and 3). The tortuosity of the pore networks, related to the permeability of the material, is determined by calculating the ratio of the true path length to geometric distance (view 4).