Rheological behavior including of SiC-based slurries containing Si, Y2O3, cornstarch and dispersant was investigated in order to provide theoretical guidance for the preparation of SiC-based porous ceramics. Shear stress and viscosity of SiC-based slurries with the shear rate were measured. Thixotropy of slurries without and with foams was characterized by thixotropic hysteresis loops. The results showed that the viscosity of slurries rapidly declined with the increasing of the shear rate when the shear rate was less than 0.02 s~(-1). While the viscosity of slurries basically kept constant at higher shear rate. Both of shear stress and viscosity of SiC-based slurries at a certain shear rate increased with the addition of components. The variation on rheological behavior of SiC-based slurries depended on each component.
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