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The Effect of Powder Granulometric Composition on the Structure and Size of the Porous Ceramics Channels

The paper studies the structure of the end-toend channel network of porous ceramic specimens. Electro corundum powders with different granulometric compositions were used to manufacture ceramics, which was achieved by grinding electro corundum in a ball mill for various time periods. The characteristic dimensions of end-to-end channels of porous ceramics were determined. A relationship was established between the granulometric composition of powders and the properties of theend-to-end channel network in porous ceramics. It is shown that the largest pores, whose size monotonically depends on the powder average particle size, comprise most of the pore space of a permeable ceramic manufactured, using narrow-fraction powders. On the other hand, if a powder with polydisperse particle size is used for ceramics manufacturing, a wide range of pore channel sizes is observed. The smaller the pores, the greater their contribution to the ceramic pore space. It should be noted that such information makes it possible to purposefully design materials with the required structure, which is most optimal for a particular product (filter elements, heat-insulating materials, etc.). Keywords — electrocorundum, permeable ceramics, end-toend channels, liquid extrusion porosimeter, granulometric powder composition, filter elements.