Abstract
A membrane support provides mechanical strength to a membrane top layer to withstand
the stress induced by the pressure difference applied over the entire membrane and must
simultaneously have a low resistance to the filtrate flow. Due to their low thermal-expansion
coefficient and good thermal-shock resistance as well as excellent mechanical and chemical stability
at elevated temperatures, porous SiC ceramics have been widely used as catalyst supports and hot-gas
or molten-metal filters. In this work, the influence of the particle size, sintering time and sintering
temperature on the porosity and permeability of supports made by dry-pressing of micron-sized SiC
powders is investigated. The present work presents a comparison of properties and performance data
for samples made with different particle size. The effects of sintering time and temperature were
analyzed in view of overall porosity and permeability. From calculations it becomes clear that
optimum values exist for the material properties of the support.
Publisher
Trans Tech Publications, Ltd.
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