关键词: 二氧化钛, 剪切粘度, 屈服应力, 粒度分布, 体积分率, 悬浮体流变性

Abstract: The rheological properties of TiO₂/water suspensions were examined by means of Brabender rheometer
with rheological method. It was observed that yield stress and steady shear viscosity of TiO₂/water suspensions with narrow PSD is higher than those
of TiO₂/water suspensions with wide PSD. When volume fraction of particle Φ is very low, the suspension exhibits Newtonian behavior. All tested pastes
exhibit shear-thinning behavior when volume fraction of particle Φ is higher than a certain value; when Φ beyond a critical value, the pastes have yield
stress and exhibit more obvious shear-thinning behavior. The shear viscosity of TiO₂/water suspensions follows a generalized Quemada model and parameters
were obtained by simulating. When the temperature is below 40℃, the shear viscosity and yield stress decrease with the increasing of temperature;
when the temperature is higher than 40℃, yield stress increases with the increasing of temperature while shear viscosity exhibits complex
behavior. The temperature dependence of shear viscosity and yield stress can be explained by collision theory of fine particles in suspending mediums.

Key words: TiO₂, shear viscosity, yield stress, particle size distribution, volume fraction, rheological properties of suspension