Fabrication of Mg−Ni hydrogen storage alloys by rotation-cylinder method

Abstract

For many years, the Mg-Ni alloys have been studied as good lightweight hydrogen storage materials, however, the alloys present strong difficulties in the fabrication process of mass products. The rotation-cylinder method (RCM) has been developed for magnesium based composites with moderate rotation under a normal atmosphere. In this study, the Mg-3, 6, 9, 12 mass%Ni alloys were easily manufactured by RCM and their hydrogenation properties were evaluated with a Sieverts-type automatic pressure-composition-isotherm (PCI) apparatus at 523, 573 and 623K. The evolution of the microstructure of as-cast specimens appeared to be a typical hypoeutectic structure. From the results of the backscattered electron image (BEI) and energy dispersive spectrometry (EDS), the difference between the composition of the α-Mg and Ni-rich eutectic regions was distinguished clearly. The hydrogenation properties of Mg-Ni alloys depended on the behavior of the nickel compositions. Especially, the hydrogen kinetics of Mg-9 mass%Ni was more excellent than the others.

Hydrogen Sorption Behavior of the MgH2-Ni Prepared by Reactive Mechanical Alloying

“…Through the XRD profiles, it is clear that the materials are composed by single phase (MgH 2 ), because Ni acts as catalyst. Hong et al (2002) showed the appearances of the composition of -Mg and the Ni-rich eutectic phase. They observed that the excellent hydrogenation properties and reaction kinetics of the Mg-9 mass% Ni alloy depended on nickel composition, and the -Mg phase acts as a hydrogen storage system and the eutectic structure as the catalytic system.…”

Preparation of Mg-based hydrogen storage materials from metal nanoparticles

“…One main disadvantage of ball milling method is that the sample could easily be polluted by steel balls and air, even in very good protection conditions. Other techniques that are usually used to prepare Mg-based materials include melting [2,[13][14][15][16], combustion synthesis [17][18][19], bulk mechanical alloying [20][21][22][23][24], melting spinning [25][26][27][28][29][30], replacement-diffusion method [31], rotation-cylinder [32,33], laser sintering [34], etc.…”