HYDROGEN PERMEABILITY OF AMORPHOUS, NANO- AND CRYSTALLINE ALLOYS BASED ON IRON AND NICKEL

Abstract

The kinetics of hydrogen permeability and diffusion in hydrogenated membrane alloys based on Fe and Ni have been investigated, which have functional characteristics, structural strength and thermal stability, and are a promising alternative to expensive palladium alloys. The strength characteristics, thermal stability and resistance to hydrogen embrittlement have been studied. The mechanisms of structuring, diffusion and permeability of hydrogen in crystalline, amorphous, nanocrystalline states are considered. For membrane alloys, a particularly important aspect is the combination in open structures (amorphous and bcc), while for hydrogen accumulation, in addition to transport channels (diffusion and permeability), high-density intermetallic clusters are also required. It is noted that, during long-term operation, due to the appearance of dense cluster configurations of intermediate ordering, which shorten the diffusion channels, the transport of hydrogen through them begins to decrease.

Keywords

• membrane alloys
• amorphous structure
• interatomic bonds
• clusters
• hydrogenation
• glass transition
• sorption
• diffusion
• permeability
• intermetallic compounds
• hydrides
• hydrogen energy
• molecular dynamics