期刊
SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS
卷 17, 期 1, 页码 313-323出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/14686996.2016.1197757
关键词
Permeability; porous ceramics; ice-templating; Ergun's equation; tortuosity
资金
- CNRS
- Saint-Gobain [BDI] from Institut National de Chimie (INC) [084877]
- European Research Council under the European Union's Seventh Framework Programme [(FP7)/ERC] [278004]
We investigate the gas flow behavior of unidirectional porous ceramics processed by ice-templating. The pore volume ranged between 54% and 72% and pore size between 2.9 mu m and 19.1 mu m. Themaximum permeability (k(1) = 1.39 x 10(-11) m(2)) was measured in samples with the highest total pore volume (72%) and pore size (19.1 mu m). However, we demonstrate that it is possible to achieve a similar permeability (k(1) = 1.09 x 10(-11) m(2)) at 54% pore volume by modification of the pore shape. These results were compared with those reported and measured for isotropic porous materials processed by conventional techniques. In unidirectional porous materials tortuosity (tau) is mainly controlled by pore size, unlike in isotropic porous structures where tau is linked to pore volume. Furthermore, we assessed the applicability of Ergun and capillary model in the prediction of permeability and we found that the capillary model accurately describes the gas flow behavior of unidirectional porous materials. Finally, we combined the permeability data obtained here with strength data for these materials to establish links between strength and permeability of ice-templated materials.
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