One Step Preparation of Vanadium Nitride by Carbothermal Reduction and Nitridation of V2O3

摘要

Vanadium nitrides were prepared via one step method of reducing V<,2>O<,3> with carbon in nitrogen. Thermogravimetric analysis and X-ray diffraction indicated that the carbothermal reduction proceeded by the following sequential reaction:V<,2>O<,3>→V<,8>C<,7> in higher temperature stage and a vanadium oxycarbide may consist in the front process of carbothermal reduction of vanadium trioxide. In one step method for vanadium nitride by carbothermal reduction and nitridation of vanadium trioxide, the nitridation process was simultaneous with the carbothermal reduction. A one-step mechanism of the carbothermal reduction with simultaneous nitridation leaded to a lower terminal temperature in nitridation process for vanadium nitride produced, compared with that of carbothermal reduction process without nitridation. The grain size and shape of vanadium nitride were uniform, and had the shape of a cube. One step method combined vacuum carborization and nitridation(namely two step method) into one process. It simplified the technological process, the costs were decreased, and the economic benefits were enhanced.