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研究了氮气气氛下V_2O_5碳热还原氮化反应的热力学和动力学,并进行了实验验证.结果表明,反应炉内V_2O_5优先还原,在碳充足的情况下,还原的中间产物依次是V2O3,VO,V2C,VC.还原氮化通常在N2气氛下同炉进行,先还原后氮化,温度高于1267℃时,VC比VN更稳定,存在动力学和热力学矛盾.V_2O_5碳热还原反应的控速环节为球形颗粒的三维扩散,氮化反应的控速环节为一级界面反应.制备了氮含量18%、钒含量78%、碳含量小于2%的钒氮合金.
The thermodynamics and kinetics of carbothermal reduction nitriding of V_2O_5 under nitrogen atmosphere were investigated and the experimental results were validated.The results showed that V_2O_5 was preferentially reduced in the reactor and the intermediate products of reduction were V2O3, VO , V2C, VC.The reduction nitridation is usually carried out in the same furnace under N2 atmosphere, the first reduction after nitriding, the temperature is higher than 1267 ° C, VC is more stable than VN, there is a dynamic and thermodynamic conflict .V_2O_5 carbothermal reduction reaction control The three-dimensional diffusion of the spherical particles was observed in the speed-up step, and the first-order interface reaction of the nitriding reaction was achieved. A vanadium-nitrogen alloy containing 18% of nitrogen, 78% of vanadium and less than 2% of carbon was prepared.