Influence of TiO2, Al2O3, and Basicity on Viscosity and Structure of High Titanium-Bearing Blast Furnace Slag

Abstract

The viscosity of high-titanium blast furnace slag with different TiO2 content, Al2O3 content, and basicity was measured at 1653–1773 K using the rotational cylinder method. The phase composition of the slag is measured by XRD. Phase diagram of the slags is calculated by FactSage software. Ionic network structure of the slags is analyzed by FT–IR. Results show that TiO2 depolymerizes the silicate network structure, reducing viscosity at high temperature, while increasing Al2O3 content generates a more complicated silicate, increasing viscosity. Basicity affects viscosity, with higher basicity resulting in lower viscosity above 1733 K. Perovskite significantly affects the viscosity of slag. This study provides an in-depth understanding of the relationship between the composition and viscosity of high-titanium blast furnace slag, which is very important for improving production efficiency.

Study of TiO2 on the Voltage Holdoff Capacity of Cr/Mn-Doped Al2O3 Ceramic in Vacuum

“…In this paper, in order to further reduce the resistivity of the Al 2 O 3 ceramic, on the basis of the previous research on Cr 2 O 3 and MnO 2 -doped Al 2 O 3 ceramics, we chose TiO 2 , with semiconductor properties, as an additive, and studied the effect of the TiO 2 addition on the performance of the Al 2 O 3 ceramics. TiO 2 has low resistivity, but few studies have been reported on the effects of TiO 2 on the resistivity and voltage holdoff capacity of Al 2 O 3 ceramics, since the valence of Ti changes in different compounds and its mechanism of action in materials is complicated [ 23 , 24 ]. On the basis of Cr/Mn-doped Al 2 O 3 ceramics, we fixed Cr 2 O 3 :MnO 2 = 1:1 (mass ratio) in this paper and studied the effects of the additional amount of TiO 2 on the microstructure, phase composition, secondary electron emission characteristics, resistivity, and surface flash properties of the Al 2 O 3 ceramic in a vacuum.…”