English
Русский Abstract: the aim of the work was to develop simpler and cheaper methods of obtaining materials based on titanium carbide, which are promising for use in high-temperature electric heaters.
For this purpose, a composite material based on titanium carbide and alumina with the use of titanium oxide, aluminum and soot as the starting components was obtained by self-propagating high-temperature synthesis. It has been established that the main stages of the synthesis process are the melting of the initial titanium and aluminum oxide, the reduction of titanium oxide by aluminum, the interaction of the reduction product of titanium oxide with carbon. The flow of a side reaction of reduction of titanium oxide by carbon can cause the formation of non-stoichiometric titanium carbide.
The additions of carbon, aluminum, titanium, manganese zirconium nickel and silicon to the phase composition, microstructure, electrical conductivity of the synthesis product, the degree of stoichiometry of titanium carbide were studied. Addition of carbon up to 10 wt. % increases the burning rate of the initial mixture, and the lattice parameter of the titanium carbide. The addition of carbon and manganese in excess of the stoichiometry allows a more complete flow of the process and allows improving the quality of the product due to a more complete removal of oxygen from the titanium carbide and increasing the specific conductivity of the resulting composite.
Keywords: self-propagating high-temperature synthesis, titanium carbide, conductive ceramics.