Abstract
The kinetics and mechanism of titanium hydride formation were studied by measurements of overall reaction rates combined with metallographic examinations of partially hydrided samples. The main part of the reaction involves the formation of a continuous protective hydride layer which progresses into the sample. Paralinear rate equations fit the kinetic behaviour over a pressure range of 30–450 Torr H 2 and temperatures of 100–250 °C. The reaction rate is controlled by the diffusion of hydrogen through the protective thickening product layer which finally reaches an apparently constant thickness for diffusion as a result of cracking on the outer surface. This maximum thickness is temperature dependent and increases abruptly above approximately 150 °C. A corresponding apparent deviation from Arrhenius dependence is observed in the linear rate constants. Morphological aspects of hydride development are described. The effect of the metal microstructure on the hydriding kinetics is discussed.
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