Synthesis Process of Titanium Sulfides Suitable for the Manufacturing Process of Titanium via the Thermal Decomposition Process by Controlling Oxygen and Sulfur Partial Pressures in a Dilute Hydrogen Gas Flow

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Abstract

<p>Recently, manufacturing of metallic titanium ingots based on a thermal decomposition process using titanium disulfide TiS2 as the intermediate product with a significantly lower decomposition temperature of approximately 4000 K was reported. However, this process involves a carbothermic reaction for preparing the intermediate product. Carbonic acid gas, a cause of global warming, was generated, and the process is inadequate from the viewpoint of environmental protection. In the present study, a reaction process without the generation of carbonic acid gas was used. Dilute hydrogen-mixed argon gas was used for the synthesis of the intermediate product. The phases of the synthesized intermediate products were investigated using X-ray diffraction and were matched to several titanium sulfide phases, such as TiS, and Ti2S3, which have a higher titanium ratio than the product, TiS2, synthesized by carbothermic reaction. The thermodynamic conditions of the synthesis process, such as the partial pressures of oxygen and sulfur, were also predicted from the product phases.</p>

Journal

  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 64 (12), 2792-2800, 2023-12-01

    The Japan Institute of Metals and Materials

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