Experimental and theoretical analysis of TiO2 powders flow properties at ambient and high temperatures

Abstract

Highlights Temperature effect on bulk flow properties of TiO 2 powders is evaluated experimentally.  Measured properties are related to the microscopic IPFs by theoretical models.  A sensitivity analysis on models' parameters is performed. AbstractChanges of bulk flow properties of two different types of titanium dioxide powders are measured at room temperature and 500 °C using the High Temperature Annular Shear Cell.A significant increase of the macroscopic bulk flow properties is observed with increasing temperature, in particular with regards to the unconfined yield strength. Two different modelling approaches are proposed with the aim to relate the measured properties to the microscopic interactions between particles. The results indicate that both the model provides a good match with the experimental data when proper values for the models' parameters are taken into account. To this end, the sensitivity analysis for the main parameters of the models is performed.

The effect of temperature on the minimum fluidization conditions of industrial cohesive particles

“…7 as a function of consolidation forces estimated with Eq. 8 are reported by Macrì et al 52,53 with reference to the flow properties of Titania powders at different temperatures, by Liu et al 54 for ashes at different temperature and by Liu et al 55 for coal. In this latter case a modified version of Eq.…”

Selective laser sintering of ceramic powders with bimodal particle size distribution

“…Castellanos et al, 2007;Valverde et al, 1998), as well as the study of powder flow properties at ambient conditions (Liu et al, 2017;Tomas, 2007), at high temperature (i.e. Chirone et al, 2018Chirone et al, , 2016Liu et al, 2018;Macrì et al, 2017bMacrì et al, , 2017aTomasetta et al, 2011) and in humid air (Landi et al, 2011).…”

Fluidized bed sintering in TiO2 and coke systems

“…The main physical properties of all the materials investigated are reported in Table 1 measured for all the components at both ambient and high temperature (500 also reported (see [17] for further details). Details on the bulk flow properties of the materials can be found at the following references: [18,19]. Table 3).…”