Carbothermal and boron carbide reduction of oxides of some transition metals

The study presents a possible mechanism to produce carbides and diborides of transition metals, such as titanium, vanadium, chromium zirconium. carbothermal synthesis metal has defined the direct dependence between thermodynamic stability oxides temperature range reduction onset (the stronger oxide, higher value is). It reaches 2000-2100, 1500-1600, 1300-1400 2100-2200°C for TiC, VC 0,88 , Cr 3 C 2 ZrC respectively. same not been found these metals. Optimum temperatures all compounds lie in 1600-1700 °C. This viable method consists transfer vaporous lower oxides. Diborides preparation involves boron vapors onto surface carbon material with subsequent chemical interaction. In case carbide-boron zirconium oxide excess carbide, reaction product will be composite (B 4 – ZrB ). ceramics based on this possesses high performance properties.