The kinetics and mechanism of oxidation of titanium, zirconium, and hafnium in air at 9733 1473 K were studied in relation to the properties of the metals.The kinetics and mechanism of oxidation of titanium, zirconium, and hafnium were extensively studied, but the behavior of these metals actually was not compared under identical conditions, except for certain data in [1]. At the same time, such data are of both practical and scientific interest, as they give insight into the features of oxidation of these metals.The purpose of this work was to reveal how the properties of titanium, zirconium, and hafnium affect the kinetic parameters, temperature dependence of rate constants, and activation energy of the oxidation, the diffusion mechanism of scaling, and properties of the scale.Experiments were carried out in air with controllable humidity at a pressure of 101.3 kPa in the range 97331473 K. The materials under study were highpurity metals (99.93% Ti, 99.80% Zr, and 99.70% Hf) melted in a fluidized bed in an electromagnetic field in an atmosphere of purified argon [2]. The technique of the preparation of 1.0(1.5) 0 1.0 0 (0.23 0.5)-cm samples with a grain size of about 50 mm and the experimental procedures in use are described in [335].
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