Ceramic Porous Elements for Filtration of Gases and Related Applications
aCarborundum Electrite Ltd., Ben·tky nad Jizerou, bJ. Heyrovsk. Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, Prague, cInstitute of Chemical Processes, Academy of Sciences of the Czech Republic, Prague, dDepartment of Inorganic Technology, Institute of Chemical Technology, Prague
A technology was developed for preparation of low-cost ceramic filtration elements in the form of disks, 20 and 25 mm in diameter. The material ofthe elements is based on fused α-alumina as well as ceramic and glaze binders. The lateral parts are hermetized with a glaze. High reproducibility of porous structure characteristics is due to uniaxial pressing of the elements. The basic porous element with a mean pore size of 12 µm can be used, e.g., to remove solid aerosols from gas streams and thus to protect sensitive devices. Asymmetric porous elements are prepared by building a thin ceramic layer off ine ?-alumina powder on the basic porous element. These two-layer elements can be used as supports for preparation of inorganic membranes and in other technologies.
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