Pore Sizes and Filtration Rates from Two Alumina Slips

Peter A. Smith, Helen Kerch, Susan Krueger, Gabrielle G. Long, Joseph Keller, Richard Haber

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11 Scopus citations


The relationship between filtration rate and the resultant green body microstructure was examined for aqueous alumina slips cast at two different deflocculation states. The volume loading of both slips was 40%. Slip viscosities of 500 and 60 mPa·s were produced by different tetrasodium pyrophosphate additions. The filtration rate of these slips varied by a factor of 2; however, mercury porosimetry results showed the same average pore size for both samples. Single and multiple small‐angle neutron scattering results showed the specimen cast with the higher‐viscosity slip to possess a bimodal pore size distribution. The body cast with the low‐viscosity slip showed unimodal porosity and, consequently, the filtration is attributed to the toroidal region between the packed particles. These results showed that mercury porosimetry does not provide a pore size that predicts filtration behavior of slips with different degrees of dispersion.

Original languageEnglish (US)
Pages (from-to)1777-1782
Number of pages6
JournalJournal of the American Ceramic Society
Issue number7
StatePublished - Jan 1 1994

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

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