마그네슘의 금속염 환원에 의한 초미립 탄화티탄 분말 합성거동

Abstract

Ultrafine titanium carbide particles were synthesized by the reaction of liquid-magnesium and vaporized TiCl4+CxCl4 (x = 1 and 2) solution. Fine titanium carbide particles with about 50 nm were successfully produced by combining Ti and C atoms released by chloride reduction of magnesium, and vacuum was then used to remove the residual phases of MgCl2 and excess Mg. Small amounts of impurities such as O, Fe, Mg and Cl were detected in the product, but such problem can be solved by more precise process control. The lattice parameter of the product was 0.43267 nm, near the standard value. With respect to the reaction kinetics, the activation energy for the reactions of TiCl4+C2Cl4 and Mg was found to 69 kJ/mole, which was about half value against the use of TiCl4+CCl4, and such higher reactivity of the former contributed to increase the stoichiometry until the level of TiC0.96 and decrease the free carbon content below 0.3 wt.%.