Effect of particle packing on the filtration and rheology behavior of extended size distribution alumina suspensions

Journal Article · Sat Jul 01 04:00:00 EDT 1995 · Journal of the American Ceramic Society

DOI:https://doi.org/10.1111/j.1151-2916.1995.tb08883.x· OSTI ID:103608

Smith, P A; Haber, R A ^[1]

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1. Rutgers Univ., Piscataway, NJ (United States). Dept. of Ceramics

The effect of particle packing on the rheology and casting behavior and cast cake characteristics of aqueous alumina suspensions (50 vol%) was investigated using the Andreasen approach. Varied packing was produced by blending two starting materials that differed in average size by a factor of 10. Formulations closes to ideal packing lowered viscosity. Specifically, the lowest viscosity suspension, 196 mPa{center_dot}s, was produced with the distribution closes to the ideal packing distribution. Typically, a well-dispersed suspension (characterized by low viscosity) casts slower than one of poorer dispersion given the same solids content. However, the suspension that provided the lowest viscosity cast at a rate of 0.41 mm{sup 2}/s, which was the fastest rate of the compared formulations. Therefore, suspensions consisting of extended size distributions do not necessitate slow filtration rates. The colloidal properties of the individual starting materials, low shear rate rheology, and mercury porosimetry were used to explain the unexpected casting behavior. The dispersion and structure formation within the suspension were investigated using electrokinetic sonic amplitude measurements. Mercury porosimetry characterized the flow channels that developed in the casts. Low shear rate rheology confirmed the presence of flocculation that was first suggested by the porosimetry results.

• Sponsoring Organization: USDOE
• OSTI ID: 103608
• Journal Information: Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 7 Vol. 78; ISSN 0002-7820; ISSN JACTAW
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM OXIDES
CONCENTRATION RATIO
DISPERSIONS
FLOCCULATION
PARTICLE SIZE
PARTICULATES
POROSIMETERS
SLIP CASTING
VAN DER WAALS FORCES
VISCOSITY
WATER