Kinetics of Destructive Hydrogenation of Ti2Cu and γ-TiCu Intermetallics


I. M. Frantsevich Institute for Problems of Materials Science of the NAS of Ukraine, Krzhizhanovsky str., 3, Kyiv, 03142, Ukraine
Powder Metallurgy - Kiev: Frantsevich Institute for Problems of Materials Science NASU, 2010, #05/06


The kinetics of Ti2Cu and γ-TiCu destructive hydrogenation is investigated. The research focuses on Ti2Cu and γ-TiCu samples in the form of plates, powders, pressed powders, and ingots. It is determined that the hydrogen pressure, temperature, and surface area of the intermetallic compounds influence in direct proportion the destructive hydrogenation rate of Ti2Cu and γ-TiCu in general and each component in particular: namely, the hydrogen dissociation rate, hydrogen diffusion rate over the volume, and reaction rate. It is shown that pressure has a greater higher effect on the maximum hydrogenation rate than temperature. The increase of titanium concentration in the intermetallides, other conditions being equal, increases the destructive hydrogenation rate by enhancing the reaction rate. The pressing of Ti2Cu and TiCu powders and ingots intensifies the destructive hydrogenation process. This is due to the formation of intermetallic catalytically active juvenile surfaces during pressing and to additional self-acceleration of surface reactions through the autocatalysis mechanism. Of all investigated items, the pressed ingots have the best kinetic characteristics because of the smallest specific fraction of the oxidized surface. This conclusion is very important application of the destructive hydrogenation process.