ANALYSIS AND DATA PROCESSING SYSTEMS

The paper describes the results of a study of the synthesis of a highly dispersed titanium carbide powder and its characteristics. Titanium carbide was obtained by carbothermal reduction of titanium dioxide by carbon nanofibers (CNFs) in a resistance furnace with a graphite heater. The reaction products were studied by X-ray phase analysis and elemental analysis. The presence of titanium carbide in the samples was established by X-ray phase analysis. The content of titanium and impurities was found by the X-ray spectral fluorescence method, total carbon was found by burning the sample in an oxygen flow with the sunsequent determination of CO2. The shape and size of the particles were determined by scanning electron microscopy with the use of the local energy dispersive X-ray microanalysis, which allowed determining the primary presence of titanium and carbon. The specific surface of the samples was measured by the method of low-temperature nitrogen adsorption (BET). The density of the samples was found. Thermo-oxidative stability was studied by simultaneous thermogravimetry (TG) and differential scanning calorimetry (DSC). The material obtained under optimal conditions is only one phase - titanium carbide. Powder particles are primarily aggregated. The average particle size and aggregates is 12.8-14.1 μm with a wide range of size distribution. The specific surface of the samples is 5.0-5.6 m2 / g. The oxidation of titanium carbide begins at a temperature of 450 °C and practically stops at 1100 °C. The optimal conditions for the synthesis of titanium carbide with the use of CNFs as a reducing agent and carbidizer include the mass ratio of TiO2 / C by stoichiometry to titanium carbide and the process carried out in a slightly reducing atmosphere (mixture of N2 + CO) at a temperature of 2000-2100 °C

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