Abstract
The feasibility of preparing ultrafine and nanometer-sized titanium carbide particles by self-propagating high-temperature synthesis (SHS) has been studied. Data are presented on the structure formation of TiC powders during SHS with a reduction step. Basic to this process is an exothermic reaction between titanium dioxide, magnesium metal, and carbon. The effects of the composition of the starting mixture, relationship between its components, and the morphology and particle size of the starting TiO2 powder on the particle size of the forming material have been investigated. The TiC powder was recovered from the sinter cake by chemical dispersion, a chemothermal treatment of the synthesis product in different solutions. The results demonstrate that treatment of the sinter cake with appropriate solutions removes impurities and causes imperfect intergranular layers to dissolve. As a result, the cake breaks down into homogeneous single-crystal particles. Subsequent treatment in different solutions further reduces the particle size of the powder. The effect of the composition of the dispersing solution on the particle size of the TiC powder has been studied. Our results made it possible to identify conditions for the preparation of titanium carbide powders containing up to 70% of particles less than 0.3 μm in size by SHS followed by chemical dispersion.
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Original Russian Text © I.P. Borovinskaya, T.I. Ignat’eva, O.M. Emel’yanova, V.I. Vershinnikov, V.N. Semenova, 2007, published in Neorganicheskie Materialy, 2007, Vol. 43, No. 11, pp. 1343–1350.
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Borovinskaya, I.P., Ignat’eva, T.I., Emel’yanova, O.M. et al. Self-propagating high-temperature synthesis of ultrafine and nanometer-sized TiC particles. Inorg Mater 43, 1206–1214 (2007). https://doi.org/10.1134/S002016850711009X
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DOI: https://doi.org/10.1134/S002016850711009X