DIRECT ELECTROLYTIC PRODUCTION OF Mo-Si-Ti-C COMPOSITES FROM THEIR OXIDES/SULFIDE/CARBON MIXTURE PRECURSOR IN MOLTEN SALT

摘要

Herein we report an electrochemical route from oxides (SiO_2, TiO_2/sulfide (MoS_2)/carbon mixture precursors to Mo-Si-Ti-C composites in molten salt. The electrochemical process was carried out in molten CaCl_2 at 800°C with a potential of 3.1 V, and a graphite-based anode was used in the electroreduction process. The reaction mechanism and the influences of the stoichiometry of the initial mixture precursor on the morphology and phase composition of the final products were investigated. It has been found that Mo5Si_3/MoSi_2/MO_3Si/Mo, Mo_5Si_3/MoSi_2/MO_2C/SiC, and Mo_5Si_3/Mo_2C/Ti_3SiC_2/TiC/Mo composites can be electrosynthesized directly from their oxides/sulfide/carbon mixture. The preliminary experimental results suggest that the electroreduction process can be used for the controllable electrolytic production of alloys/carbide-containing composites from oxides/sulfides/carbon precursors.