Abstract
TG, X-ray diffractometry, optical microscopy and X-ray microanalysis have been used for kinetics studies on the oxidation mechanism of ferrochromium powder in the surrounding of magnesiochromite or periclase. It is shown that the transport of the reactants is the rate determining step of the oxidation process, and that diffusion of oxygen in the gas phase is the predominant factor in the initial stage, whereas lattice diffusion becomes the rate determining step in the latter stages. When the metal is dispersed in a non-metallic phase it has been found that the oxidation rate is faster and very sensitive to the nature of the dispersing medium. In oxidation processes considerable acceleration has been found when the dispersing medium reacts with the oxidation products.
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