碳热还原法制备碳化钒钛固溶粉体

摘要

以偏钒酸铵、石墨和二氧化钛为原料通过碳热还原法制备了单相碳化钒钛固溶粉体。结合DSC、XRD、SEM分析方法研究了碳化钒钛粉体制备过程中低温一次还原与高温二次还原的物相组成，优化了配碳系数。结果表明，和偏钒酸铵直接碳热还原及二氧化钛直接碳热还原相比，偏钒酸铵和二氧化钛混合粉料碳热还原反应物之间的接触面积增加，有利于还原反应的进行。当配碳系数为0.8时经高温二次还原形成结晶较好的单相碳化钒钛固溶体。%Single phase TiVC2 was prepared by carbothermal reduction of metavanadate, graphite and titanium dioxide mixed raw materials. Phase composition and optimized carbon coefifcient were investigated by combination of XRD and SEM analysis. Results showed that single phase TiVC2 with good crystallinity was obtained after second reduction when the carbon coefifcient was 0.80.