Identification of rheological parameters by the squeezing test

Ceramic paste extrusion is investigated using a squeezing test, which compresses a disk of paste between two parallel plates, one of which is moving at a constant speed. From this test, the two-phase nature of ceramic paste can be evidenced. Liquid migration is observed at low compression speed, resulting in very dry paste at the end of the test. e of this squeezing test for discriminating paste formulation is illustrated with titanium and aluminium oxide pastes. This test is also a good tool for constructing a two-phase model for paste flow modelling. The paste is composed of a pseudoplastic saturated solid and a Newtonian liquid phase. parameters K and m, characterising the saturated solid rheology, and k, filtration coefficient characterising the two-phase interaction, can be identified from runs at low and high compression speeds.