Comparison of the compressive yield response of aggregated suspensions: Pressure filtration, centrifugation, and osmotic consolidation

Journal Article · Tue Oct 01 04:00:00 EDT 1996 · Journal of the American Ceramic Society

DOI:https://doi.org/10.1111/j.1151-2916.1996.tb09014.x· OSTI ID:413307

Miller, K T; Melant, R M; Zukoski, C F ^[1]

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1. Univ. of Illinois, Urbana, IL (United States)

The compressive rheological responses of suspensions containing flocculated kaolin, alumina (average particle sizes of 0.2 and 0.5 {micro}m), and hydrous zirconia (average particle sizes of 8, 57, and 139 nm) particles have been measured using three different techniques: pressure filtration, volume fraction profile during centrifugation, and sediment height during centrifugation at multiple spinning speeds. While the volume fraction profile technique appears to be experimentally most robust, equivalent responses are found using the different techniques, indicating that the compressive yield stress is a material property of a given suspension. The compressive yield stress of each suspension increases rapidly with volume fraction but cannot be generally described using simple power-law or exponential fits. The compressive yield stress also increases with the inverse square of particle size. The packing behavior of the suspensions undergoing osmotic consolidation is compared with the mechanical compressive yield response. Some suspensions exhibited the same packing behavior as in the mechanical techniques, while others consistently packed to higher densities during osmotic consolidation. Although equivalent osmotic and mechanical loads do not always result in the same volume fractions, the similar increases in volume fraction with applied driving force suggest that both the osmotic and mechanical techniques are controlled by the force needed to rearrange the particle network.

• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: FG02-91ER45439
• OSTI ID: 413307
• Journal Information: Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 10 Vol. 79; ISSN 0002-7820; ISSN JACTAW
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AGGLOMERATION
ALUMINIUM OXIDES
BULK DENSITY
COMPRESSION STRENGTH
DRYING
KAOLIN
OSMOSIS
PARTICLE SIZE
PARTICULATES
PRESSURE DEPENDENCE
SEDIMENTATION
SLIP CASTING
SUSPENSIONS
YIELD STRENGTH
ZIRCONIUM OXIDES