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Registration Number

0216U003187, 0111U005364 , R & D reports

Title

The effect of the phase and structural states on hydrogen - sorption properties of heterophasis alloys of the systems of Ti - Fe - Mn and Ti - Zr - Mn - V

Head

Ivanchenko V.G.,

Registration Date

15-01-2016

Organization

Institute of Metal Physic G.V.Kurdyumov NAS of the Ukraine

Description

Natural composites formed by eutectic crystallization, consisting of bcc ? (Ti, Zr, Mn) solid solution and (Ti,Zr)Mn2-х Laves phase are suitable materials for hydrogen accumulation. ? (Ti, Zr, Mn) solid solution has high hydrogen capacity while Laves phase is characterized with acceptable working temperature, easy surface activation, and has significant interface area free of oxide films. Combining of the advantages of both these phases leads to a substantially increased sorption capacity and improved kinetic and thermodynamic parameters of hydrogenation and dehydrogenation processes. The solid solution based on titanium absorbs hydrogen with kinetics similar to hydrogen sorption kinetic of intermetallics and in a short time achieves high hydrogen storage capacity. This feature is associated with a high surface area of the interface, typical eutectic structures for which the hydrogen diffusion coefficient is approximately 1000 times higher than the volume diffusion. Process of hydrogenation occurs avalanche-like due to brittleness of Laves-phase, which leads to rapid cleavage of formed hydride and the formation of clean surface ready for hydrogen sorption. Also hydrogen capacities of each of the phases in eutectic structure upon hydrogenation exceed their capacity at individual hydrogenation under the same conditions.

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Дехтяренко Володимир Анатолійович
Мельник Ігор Іванович
Прядко Тетяна Володимирівна