Abstract
ABSTRACT This paper describes the preparation route and formation mechanism of a Al2O3–Ti2O3 composite. During the fabrication of a ferro-titanium alloy from titanium concentrate via a thermite method, CaO is generally added to reduce the viscosity of the liquid and promote the separation of the ferro-titanium alloy and Al2O3–CaO–TiO2 slag. The latter represents a multi-oxide system mainly composed of CaAl12O19, CaAl4O7, and CaTiO3 species with poor high-temperature performance, which considerably limits its practical application. The performance optimization and high value-added application of this slag involve the elimination of the CaO phase and replacement of TiO2 with Ti2O3 particles to prevent the formation of a multi-oxide system due to the low solubility of Ti2O3 in Al2O3. The Al2O3–Ti2O3 composite material was successfully prepared via industrial experiments, and its synthesis mechanism and corresponding reaction model are established.
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