Role of some technological parameters during carburizing titanium dioxide |
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| Affiliation: | 1. Departamento de Física, Instituto Nacional de Investigaciones Nucleares, Apartado postal 18-1027, México D.F. C.P. 11801, Mexico;2. Facultad de Química, Universidad Autónoma del Estado de México, Paseo Colón y Tollocan, Toluca C.P. 50110, Mexico;3. Laboratorio de Investigación y Desarrollo de Materiales Avanzados, Facultad de Química, Universidad Autónoma del Estado de México, Km 14.5 Carr, Toluca, Atlacomulco, Mexico;4. Departamento de Quimica, Instituto Nacional de Investigaciones Nucleares, Apartado postal 18-1027, México D.F. C.P. 11801, Mexico;5. Tecnológico de Estudios Superiores de Jocotitlán, carretera Toluca-Atlacomulco Km. 44.8, Ejido de San Juan y San Agustín, Jocotitlán, México, C.P. 50700 |
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| Abstract: | The influence of technological parameters is followed during the carbothermal synthesis of titanium carbide from the dioxide. The carbon grain size, the homogeneity of the carbon/oxide mixtures and the ventilation of the powders' beds are the most important conditions for a rapid reaction. The oxide grain size, the mixing method and the compactness of the mixture has no influence, or very little. These results are explained by the carburizing mechanism where the Boudouard's reaction: C+CO2→2CO plays a central role. This reaction is more rapid when fine carbon is used and when the carbon monoxide is eliminated as soon as formed. These conditions are those required for a complete synthesis of the carbide by: TiO2+3C→TiC+2CO for mixtures having the stoichiometric composition. |
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