Carbothermal synthesis of ultra-fine zirconium carbide powders using inorganic precursors via sol-gel method

摘要

Ultra-fine zirconium carbide (ZrC) powders have been synthesized by carbothermal reduction reactions using inorganic precursors zirconium oxychloride (ZrOCl2 centre dot 8H2O) as sources of zirconium and phenolic resin as the carbon source.The reactions were substantially completed at relatively lower temperatures (~1400 °C/1 h) and the synthesized powders had a small average crystallite size (<200 nm) and a large specific area (54 m2/g).The oxygen content of the powder synthesized at 1400 °C/1 h was less than 1.0 wt%.The thermodynamic change process in the ZrO2-C system and the synthesis mechanism were studied.