Study the possibility of obtaining micro-and nanopowder nitride composition Si<sub>3</sub>N<sub>4</sub>-TiN in silicon halide - sodium azide - titanium halide system by SHS azide technology
The possibility of obtaining a nitride of the composition Si<sub>3</sub>N<sub>4</sub>-TiN of asigny systems Na<sub>2</sub>SiF<sub>6</sub>-NaN<sub>3</sub>-Na<sub>2</sub>TiF<sub>6</sub>, (NH<sub>4</sub>)<sub>2</sub>SiF<sub>6</sub>-NaN<sub>3</sub>-(NH<sub>4</sub>)<sub>2</sub>TiF<sub>6</sub>, Nа<sub>2</sub>SiF<sub>6</sub>-NaN<sub>3</sub>-(NH<sub>4</sub>)<sub>2</sub>TiF<sub>6</sub>, (NН<sub>4</sub>)<sub>2</sub>SiF<sub>6</sub>-NaN<sub>3</sub>-Na<sub>2</sub>TiF<sub>6</sub> with different ratio of components in the starting material by technology of self-propagating high-temperature synthesis. It is established that the final product obtained is a fine (submicrocrystalline) powder of spherical and equiaxed shape with average particle size of 150-250 nm. The final product consists not only of Si<sub>3</sub>N<sub>4</sub>, TiN and Ti<sub>2</sub>N, but it includes by-products: silicon, titanium, titanium silicide TiSi<sub>2</sub> and halide salt - hexaferrite sodium Na<sub>2</sub>TiF<sub>6</sub>. The presence of side products is due to the fact that the combustion temperature of the systems studied are not sufficient to undergo the necessary chemical reactions nitriding and obtain the nitride of the composition Si<sub>3</sub>N<sub>4</sub>-TiN without impurities.