Gas atomization for hydrogen storage powders
Gas atomization is an industrial powder production process in which a stream of molten alloy is disintegrated by high-pressure gas jets into fine droplets that rapidly solidify into spherical particles, producing powders with very fine and often homogeneous microstructures.[2] In this research, gas atomization is used to synthesize the Ti0.488Fe0.460Mn0.052 TiFe-based alloy powder, enabling control over particle size, cooling rate, and microstructural refinement to tailor hydrogen storage properties.[1][2]
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Ti0.488Fe0.460Mn0.052 TiFe-based hydrogen storage alloy
The Ti0.488Fe0.460Mn0.052 alloy is a TiFe-based intermetallic material engineered for reversible hydrogen storage, produced here by gas atomization to obtain a fine powder microstructure that supports improved first hydrogenation kinetics and capacity after mechanical activation.[1][2] It belongs to the class of interstitial metal hydrides, where hydrogen atoms occupy lattice sites in the TiFe matrix and associated secondary phases, enabling absorption of about 1.5–2 wt.% hydrogen under moderate conditions depending on processing.[2]
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Mechanical activation: cold rolling, ball milling, and cold pressing
Mechanical activation refers to the use of processes like cold rolling, ball milling, and cold pressing to modify the microstructure and surface state of metal hydride alloys to improve their first hydrogenation behavior after air exposure.[1][2] In the Ti0.488Fe0.460Mn0.052 study, all three methods allowed hydrogen absorption by breaking passive oxide layers and introducing defects, with cold pressing delivering the highest hydrogen capacity and ball milling the fastest kinetics, while cold rolling offered effective regeneration with relatively simple processing.[1]
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