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.
Refractories and Industrial Ceramics – Springer Journals
Published: Nov 26, 2007
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