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The properties of water suspensions of commercial alumina and rational conditions for slip casting

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The properties of water suspensions of finely ground commercial alumina, precalcined at 1450°C, over a wide pH range and concentration, were investigated. Curves were drawn to determine the viscosity of the limiting structural breakdown.

The presence in the suspensions of two pH ranges, in which maximum zeta-potential values are reached corresponding to minimum viscosity, was confirmed and also for viscosity of the limiting structural breakdown.

It is shown that the slip in acid conditions compared with alkaline, belongs to a more liquid system characterized by a sharp reduction in shear force and thixotropic reinforcement for the minimum viscosities, and also by a greatly reduced viscosity of the limiting structural breakdown. In acid conditions there is an increase in the absolute values of zeta-potential and the cast specimens become quite dense.

Confirmation was obtained of the desirability of casting products from commercial alumina in acid conditions and of getting the optimum pH interval.

To increase the density of the products they should be cast from vacuumized slips and preferably under vacuum.

Heating the slip to 30–40°C reduces its viscosity, increases the casting rate and in conjunction with the vacuumizing even slightly increases the density of the casts. As a result it becomes possible to increase the density of the dried casts and to reduce the shrinkage during firing.

To increase the strength of the wet and dried casts saccharose appears to be the best bond.

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Authors and Affiliations

  1. Kharkov V. I. Lenin Polytechnical Institute, USSR

    G. V. Kukolev

  2. Ukraine Scientific Research Institute of Refractories, USSR

    A. G. Karaulov

Authors
  1. G. V. Kukolev
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  2. A. G. Karaulov
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Kukolev, G.V., Karaulov, A.G. The properties of water suspensions of commercial alumina and rational conditions for slip casting. Refractories 4, 184–191 (1963). https://doi.org/10.1007/BF01290427

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