Journal
ACTA MATERIALIA
Volume 71, Issue -, Pages 126-135Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2014.03.003
Keywords
Tortuosity; Porosity; Transport properties; X-ray computed tomography; Finite difference modeling
Funding
- MRSEC program of the National Science Foundation at the Materials Research Center of Northwestern University and National Science Foundation [DMR-1121262, DMR-0746424]
- NSF-NSEC
- NSF-MRSEC
- Keck Foundation
- State of Illinois
- Northwestern University
- US DOE [DE-AC02-06CH11357]
- National Science Foundation [OCI-1053575, TG-DMR110007]
- University of Michigan Advanced Research Computing
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Synchrotron source X-ray micro-computed tomography was used for non-destructive three-dimensional (3-D) imaging of porous alumina structures, in which the porosity was induced by a granular porogen, added in amounts of 10-60 vol.%. Microstructural characteristics related to transport properties, including connectivity and tortuosity, were measured from the resulting 3-D data sets. Connectivity of 94.5-99.6% was measured for samples produced with 35-60% porogen (30.8-49.6% porosity). Two methods of calculating tortuosity, path length ratio and gas phase flux were compared, and the effect of sample volume on calculated tortuosity value and computational time was examined. Average sample tortuosity calculated using the two methods generally agreed, although significant directional anisotropy was detected in some cases for the gas phase flux calculation method. Tortuosity values as low as 1.5 were measured for alumina components with 49.6% porosity. (C) 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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