SYNTHESIS AND CHLORINATION OF TITANIUM OXYCARBIDE

摘要

The paper presents results of a systematic study of synthesis of titanium oxycarbide and its chlorination. Titanium oxycarbide was produced by carbothermal reduction of titania in hydrogen, argon and helium. Formation of titanium oxycarbide started at 1200℃ in all gases. The reduction was the fastest in hydrogen. Formation of titanium oxycarbide in hydrogen wts close to completion in 120 min at 1300℃, 60 min at 1400℃ and less than 30 min at 1500℃. Reduction in argon and helium progressed at a similar rate and reached 90-95% after 300 min at 1400-1500℃. The chlorination of titanium oxycarbide was ignited at 150-200℃. Chlorine partial pressure and gas flow rate strongly affected the chlorination rate. Chlorination of titanium oxycarbide produced with carbon to titania molar ratio 2.5 at 235-400℃ was close to 100% in 30 min.