Corundum-Ti2O3 two-phase material is a by-product obtained via adjusting the smelting process of low-ferrotitanium alloy. Al2O3 and Ti2O3 exist independently in raw material, which can be used as a refractory raw material. According to the results by thermogravimetry-differential scanning calorimetry and thermodynamic analysis, the oxidation reaction of Ti2O3 in the raw material starts at 700 ℃, and the reaction between Al2O3 and TiO2 starts at 1 263 ℃. The results by X-ray diffraction and scanning electron microscopy indicate that Ti2O3 completes the oxidation reaction at 800 ℃, which is affected by the decomposition reaction of Al2TiO5 at 1 300 ℃, only part of TiO2 and Al2O3 reacts at the corundum junction to form flake Al2TiO5. As the sintering temperature is increased to 1 400 ℃ and 1 500 ℃, the reaction of Al2O3 and TiO2 to form Al2TiO5 is gradually completed, and a typical columnar aluminum titanate is formed on the basis of flakes.