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Permeability of Laminated Green Ceramic Tapes as a Function of Binder Loading

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The gas permeability of laminated green ceramic tapes was determined versus organic loading for samples subjected to air oxidation. The dielectric in the tapes was barium titanate, and the binder consisted primarily of poly(vinyl butyral) and dioctyl phthalate. Both the normalized gas flux and the gas permeability were seen to approach constant values for five or more tapes laminated together. Because the characteristic pore size was 0.5–1 m, Poiseuille flow was the dominant flow mechanism, and thus Darcy's law was valid. The permeability of five laminated tapes was a factor of five smaller than for unlaminated tapes. Values were also obtained for the permeability versus binder loading in terms of the microstructural features of specific surface, porosity, and a parameter to account for tortuosity and constrictions.
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Document Type: Research Article

Affiliations: Department of Chemical Engineering, University of Missouri, Columbia, Missouri 65211

Publication date: May 1, 2008

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