Rheology in the technology of ceramics and refractories. Part 6. Dilatant systems and factors determining their properties

Rheology in the technology of ceramics and refractories. Part 6. Dilatant systems and factors... The effects of various factors, including the characteristics of the solid phase, bulk concentration, stabilization, coagulation, temperature, and vibrations, on the dilatant properties of high-density ceramic binding suspensions are considered. The main factor controlling the dilatancy is the proximity of the actual bulk concentrationC v to the critical valueC v cr, corresponding to the concentration of shape formation (conversion of the suspension into a solid). Suspensions of quartz glass withC v cr=0.91 possessed a Newtonian character of flow forC v=0.75−0.78, while suspensions withC v cr=0.70−0.75 exhibited a strong dilatancy even in the range ofC v=0.60−0.64. The dilatancy of some highly disperse suspensions at much lower values ofC v is caused by a high value of the effective bulk concentrationC v ef, including a considerable volume of bound liquid. On the basis of results of original studies and generalization of published data, a mechanism is formulated according to which dilatancy is treated as due to the effect of constrained volume in disperse systems. Most suspensions are characterized by a bulk dilatancy according to Reynolds. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Refractories and Industrial Ceramics Springer Journals

Rheology in the technology of ceramics and refractories. Part 6. Dilatant systems and factors determining their properties

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Publisher
Springer Journals
Copyright
Copyright © 1997 by Plenum Publishing Corporation
Subject
Chemistry; Characterization and Evaluation of Materials; Materials Science; Ceramics, Glass, Composites, Natural Methods
ISSN
1083-4877
eISSN
1573-9139
D.O.I.
10.1007/BF02767924
Publisher site
See Article on Publisher Site

Abstract

The effects of various factors, including the characteristics of the solid phase, bulk concentration, stabilization, coagulation, temperature, and vibrations, on the dilatant properties of high-density ceramic binding suspensions are considered. The main factor controlling the dilatancy is the proximity of the actual bulk concentrationC v to the critical valueC v cr, corresponding to the concentration of shape formation (conversion of the suspension into a solid). Suspensions of quartz glass withC v cr=0.91 possessed a Newtonian character of flow forC v=0.75−0.78, while suspensions withC v cr=0.70−0.75 exhibited a strong dilatancy even in the range ofC v=0.60−0.64. The dilatancy of some highly disperse suspensions at much lower values ofC v is caused by a high value of the effective bulk concentrationC v ef, including a considerable volume of bound liquid. On the basis of results of original studies and generalization of published data, a mechanism is formulated according to which dilatancy is treated as due to the effect of constrained volume in disperse systems. Most suspensions are characterized by a bulk dilatancy according to Reynolds.

Journal

Refractories and Industrial CeramicsSpringer Journals

Published: Nov 26, 2007

References

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