Filtration technology using membranes has a wide range of applications. So far, organic filters commonly have been used, although these filters have relatively low temperature limitations (typically < 200 °C) and lack chemical stability. Ceramic membrane filters have a potential capability for replacing organic filters for some applications, because of their superior high-temperature and chemical stability [1].They are usually constructed by coating a thin membrane layer onto a microporous support to provide desirable mechanic strength. Membrane layer usually has the pores of about 10 times smaller in diameter than the substrate and its thickness does not exceed several dozens micrometres. If it is required to eliminate particles of the smaller size, the multilayered filter is created in which pore size of each subsequent layer is less than in the previous ones. This construction provides both a relatively high permeability and high selectivity.The main objective of this paper is to investigate the features for creating submicrometer pore sized ceramic membrane layers on microporous ceramic supports.
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