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Permeability and high temperature strength of porous mullite-alumina ceramics for hot gas filtration

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Abstract

The gas permeability and mechanical properties of mullite-alumina ceramics for potential use as filters in hot gas separation environments are examined. The mullite-alumina ceramics with different levels of induced porosity and pores sizes were fabricated by slip casting and characterised in terms of microstructure and strength properties at ambient and elevated temperatures. Permeability to nitrogen gas flow of the porous structures at ambient temperature was investigated over a range of flow velocities to quantify and assess the permeability. The strength at high temperatures is equivalent to ambient data signifying no discernible degradation. Nitrogen gas permeability tests reveal dramatic reductions in the pressure drop–gas velocity curves with increasing porosity. It is shown that the gas permeability increases with the level of porosity and pore size, with maximum Darcian permeability constant of k = 2.5×10−14 m2 for a porosity of 71%.

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Author notes

  1. L. Henkel

    Present address: Year-in-Industry student from the Department of Production Engineering, University of Bremen, Bibliothekstraße 1, Bremen, 28359, Germany

Authors and Affiliations

  1. Materials and Engineering Science, Australian Nuclear Science and Technology Organisation, Private Mail Bag 1, Menai, New South Wales, 2234, Australia

    B. A. Latella, L. Henkel & E. G. Mehrtens

Authors
  1. B. A. Latella
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  2. L. Henkel
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  3. E. G. Mehrtens
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Correspondence to B. A. Latella.

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Latella, B.A., Henkel, L. & Mehrtens, E.G. Permeability and high temperature strength of porous mullite-alumina ceramics for hot gas filtration. J Mater Sci 41, 423–430 (2006). https://doi.org/10.1007/s10853-005-2654-8

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  • DOI: https://doi.org/10.1007/s10853-005-2654-8

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