Study on High-Temperature Oxidation Characteristics of Pure Vanadium

Abstract

The pure vanadium specimen of 99.65% relative density was prepared by hot isostatic pressing. The initial oxidation characteristics and constructions of pure vanadium at different temperatures were analyzed by thermogravimetric test apparatus (TGA), X-ray diffraction (XRD), and scanning electron microscopy (SEM). The results show that the oxidation process and oxygen uptake of pure vanadium follow parabolic kinetics. The activation energy for the oxidation process is 118KJ/mol. With the rising of temperature, the predominant oxide phases are VO0.03, VO2 and V2O5 in turn. Under 500°C , the specimens’ surface morphology is densely distributed. While at 600°C , the fine fish-scale-shaped morphology is evenly distributed.