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Pore Sizes and Filtration Rates from Two Alumina Slips
Author(s) -
Smith Peter A.,
Kerch Helen,
Krueger Susan,
Long Gabrielle G.,
Keller Joseph,
Haber Richard A.
Publication year - 1994
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1994.tb07050.x
Subject(s) - porosimetry , slip (aerodynamics) , porosity , materials science , composite material , microstructure , filtration (mathematics) , mercury intrusion porosimetry , mineralogy , viscosity , porous medium , chemistry , thermodynamics , statistics , physics , mathematics
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.