Process optimization for production of ultrafine titanium carbonitride by magnesium reduction

抄録

The ultrafine titanium carbonitride particles (TiC_0.7N_0.3) below 100 nm in mean size were successfully synthesized by Mg-thermal reduction process. The nanostructured sub-stoichimetric titanium carbide (TiC_0.7) particles were produced by the magnesium reduction at 1163 K of gaseous TiCl₄ + xC₂Cl₄ and the vacuum heat treatments were performed for five hours to remove residual magnesium and magnesium chloride mixed with TiC_0.7. And final TiC_0.7N_0.3 phase was obtained by nitrification under normal nitrogen gas at 1373 K for 2 h. The high quality of crystal form of TiC_0.7N_0.3 with the purity above 99.5% and the level near 0.1 mass% oxygen, were produced. We discovered in particular that the temperature lower than 1123 K in vacuum treatment helped to produce the finer and uniform TiCN particles.