Effect of Carbon Content on Preparation of Vanadium Carbide Nanopowders by the Carbonization of the Precursor

Abstract:

Vanadiunm carbide (V8C7) nanopowders were prepared by the solution-derived precursor method, ammonium vanadate (NH4VO3) and glucose (C6H12O6) were used as raw materials. The samples were characterized by TG-DTA, XRD and SEM. The results show that the weight of the sample reduces rapidly before 600°C (about 25 wt.%), but it changes very slowly (about 1.0 wt.%) after 600°C. The DTA curve mainly includes 5 endothermic peaks and an exothermic peak which are corresponding to the peaks of 110°C, 300°C, 348°C, 677°C, 1000°C and 509°C, respectively. When the carbon content between 24 wt.% and 30 wt.%, the samples mainly consist of V2O3 and VC1−X (1−X = 0.66–0.88). When the carbon content is 32 wt.%, the sample includes a main phase (V8C7) and a second phase (V2O3). When the carbon content reaches to 36 wt.%, the single-phase V8C7 powder can be obtained. The SEM results show that major powders exhibit good dispersion and are mainly composed of particles with a mean diameter of ~200 nm.

• Periodical: Advanced Materials Research (Volumes 476-478)
• Pages: 480-483
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.476-478.480
• Online since: February 2012
• Authors: Zhi Wei Zhao, Hong Juan Zheng, Wei Qiang Song, Shu Fang Mao, Ya Ping Li
• Keywords: Crystal Structure, Microstructure, Nanopowder, Precursor, Vanadiunm Carbide

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