N. I. Sidorov, S. Kh. Estemirova, E. D. Kurbanova, V. A. Polukhin.
ABSTRACT
The analysis of kinetic characteristics – diffusion (D) and permeability (Ф) of hydrogen in membrane alloys based on binary alloys Fe-Ni, Nb-Ni, V-Ni. Various structural modifications of membrane alloys were studied – amorphous, nanocrystalline and duplex, and the efficiency of selectivity processes in each of these modifications was determined. The influence of thermodynamic parameters – temperature and pressure – on the permeability, diffusion of hydrogen and its flux (JH ~ D · Ф) in the indicated alloys is revealed. The analysis of the results of calculations and experimental measurements for hydrogenated and titanium-doped membrane alloys based on binary compositions Nb85Ni15 and V85Ni15 as alternatives to those known based on Pd1-xAgx is carried out. It has been found that the intense formation of hydrides in these alternative membrane alloys is as undesirable as for traditional Pd-based alloys. Titanium-doped crystalline alloys Nb-Ti-Ni and V-Ti-Ni – are a combination of solid solutions: a primary phase with a bcc structure [Nb (V), Ti] and a eutectic phase {bcc – [Nb (V), Ti) + B2 – TiNi}. In this case, the eutectic phase, as a part of the duplex matrix structure, prevents the hydrogen embrittlement of the Nb-Ti-Ni and V-Ti-Ni alloys.
KEYWORDS
membrane alloys, amorphous structure, interatomic bonds, clusters, hydrogenation, glass transition, sorption, diffusion, permeability, intermetallics, hydrides, hydrogen energy, molecular dynamics.
DOI: 10.31857/S0235010622020086