Abstract
It is observed how the hydriding and dehydriding reaction rates of FeTi approach to the intrinsic ones as the heat effect is reduced sequentially by mixing the sample with Mn powder in a stainless steel reactor or using a specially designed Cu tube reactor with the mixtures. Nearly intrinsic hydriding rate data are obtained by mixing the sample with Mn powder in the Cu reactor. An empirical rate equation is deduced from the results and the equation is helpful in the expectation and analysis of the heat effect for a given set of experimental data. The dependences of the hydriding reaction rates on the hydrogen pressure and the hydrogen concentration is analysed, and it is verified that the kinetic behavior changes with temperature. Heat effect is more pronounced in the dehydriding reaction than the hydriding. Dehydriding rate data with a minimum heat effect are presented.
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