Rheological Properties of Typical Ceramic Slurries Used in the Lost Wax Technology

Abstract

The results of investigations of the rheological properties of typical ceramic slurries used in the investment casting technology -the lost wax technology are presented in the paper. Flow curves in the wide range of shear velocity were made. Moreover, viscosity of ceramic slurries depending on shearing stresses was specified. Tests were performed under conditions of three different temperatures 25, 30 and 35 o C, which are typical and important in the viewpoint of making ceramic slurries in the investment casting technology. In the light of the performed investigations can be said that the belonging in group of Newtonian or Non -Newtonian fluid is dependent on content of solid phase (addition of aluminum oxide) in the whole composition of liquid ceramic slurries.

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Rheological Properties of Typical Ceramic Slurries Used in the Lost Wax Technology

“…Fluids behaviour in dependence of external stresses, it means in dependence of deformations occurring in material subjected to strains, can be divided in a way shown in Fig 1. Real fluids are usually divided into two basis groups [2][3][4]: • Newtonian fluids -subordinated to the law stating that tangent stresses in fluids are directly proportional to the shear rate, thus their dynamic viscosity is constant and independent of the shear rate, • Non-Newtonian fluids -in which viscosity is not a constant value, but depends on several factors, among others on a temperature, shear rate or mixing time. Ceramic slurries as well as binders applied in the investment casting technology, in dependence of their viscosity belong either to the Newtonian or non-Newtonian fluids [5,6]. In order to determine rheological properties of non-Newtonian fluids a larger number of characterizing parameters is needed, than in case of the Newtonian fluids.…”

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