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

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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.

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Authors and Affiliations

  1. Belgorod State Technological Academy of Construction Materials, Belgorod, Russia

    Yu. E. Pivinskii

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Translated from Ogneupory i Tekhnicheskaya Keramika, No. 4, pp. 2–14, April, 1997.

For the previous articles of this series see Refractories and Industrial Ceremics No. 3 (1994), No. 12 (1995), Nos. 1 and 10 (1996), and No. 2 (1997).

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Pivinskii, Y.E. Rheology in the technology of ceramics and refractories. Part 6. Dilatant systems and factors determining their properties. Refract Ind Ceram 38, 131–142 (1997). https://doi.org/10.1007/BF02767924

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