Conclusions
The sizes of open pores in a cermet filter manufactured from a given powder fraction with spherical particles may vary over a wide range if the pores are formed in powders differing in size and degree of packing.
The finer the powder fraction used in the manufacture of a cermet filter (or the thicker the filter), the better relationship (1) will hold:d=0,155a min (valid at δ ≥3 mm in filters made from powders not exceeding 0.3–0.4 mm in particle size).
The filtration sharpness of thin-walled cermet filters manufactured from coarse powders (fraction of 0.4mm or larger sizes. δ ≤ 3 mm) should be determined by measuring the maximum size of particles passed through the filter, or be calculated from the relationshipd=0,4=a max.
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Literature cited
C. Agte and K. Ocetek, Cermet Filters, Their Manufacture, Properties and Application [Russian translation], Sudpromgiz, Moscow (1959).
J. Heartlein, J. of Metals,9, No. 3 (1957).
V. Morgan, Filter Elements by Powder Metallurgy, Symposium on Powder Metallurgy (1954); The Iron and Steel Institute, Special Report, No. 58, London, pp. 81–89 (1956).
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Shibryaev, B.F. Pore size and filtration sharpness of cermet filters as functions of the spherical-powder fractions. Powder Metall Met Ceram 2, 302–306 (1964). https://doi.org/10.1007/BF00774037
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DOI: https://doi.org/10.1007/BF00774037