Browsing by Author "Henkel, L"

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    Permanability and mechanical properties of porus mullite-alumina ceramics
    (Institute of Materials Engineering, Australasia Ltd, 2004-11-29) Henkel, L; Latella, BA; Mehrtens, EG
    High porosity materials are used widely in specialty filtration applications. Structural ceramic filters are common in hot gas filtration environments particularly coal combustion and gasification, catalytic recovery and petrochemical processes [1]. The leading ceramic filter candidates are cordierite, mullite, alumina and silicon carbide. The design requirements for these ceramic filters, whose main function is removal of fine particles at temperature, are high porosity, adequate strength, erosion and thermal shock resistance and decent flow (i.e. permeability) characteristics. In this presentation we report the gas permeability and mechanical properties of mullite-alumina ceramics with different levels of porosity. The materials were characterised in terms of microstructure and strength properties at ambient and elevated temperatures. The room temperature gas permeability of the porous structures was investigated over a range of flow velocities to quantify and assess the permeability changes due to processing and microstructural variables. The reliability and issues concerning the estimation of permeability constants will be discussed. The implications of microstructural tailoring for optimising gas permeability and strength are considered.