Pore sizes and filtration rates from two alumina slips

Journal Article · Fri Jul 01 04:00:00 EDT 1994 · Journal of the American Ceramic Society; (United States)

DOI:https://doi.org/10.1111/j.1151-2916.1994.tb07050.x· OSTI ID:7155238

Smith, P A ^[1]; Kerch, H; Krueger, S; Long, G G ^[2]; Keller, J; Haber, R A ^[3]

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1. Pacific Northwest Lab., Richland, WA (United States). Materials Science Dept.
2. National Inst. of Standards and Technology, Gaithersburg, MD (United States). Ceramics Div.
3. Rutgers-the State Univ., Piscataway, NJ (United States). Dept. of Ceramics

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[center dot]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.

• DOE Contract Number: AC06-76RL01830
• OSTI ID: 7155238
• Journal Information: Journal of the American Ceramic Society; (United States), Journal Name: Journal of the American Ceramic Society; (United States) Vol. 77:7; ISSN 0002-7820; ISSN JACTAW
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CASTING
CHALCOGENIDES
FABRICATION
MICROSTRUCTURE
OXIDES
OXYGEN COMPOUNDS
POROSITY
SCATTERING
SLIP CASTING
SMALL ANGLE SCATTERING