The Study Of Hydrogen Absorption By Vanadium And Enhanced Hydrogen Absorption Effect Of Vanadium-Lithium Alloy

Vanadium-based solid solution Hydrogen storage alloys become a studying hotspot because of their high Hydrogen storage capacity and high velocity of Hydrogen absorption and desorption.Vanadium has the properties of high Tritium storage density and high temperature of desorbing Tritium,it meets the need of neutron generator's Tritium target,thus it can be used for Tritium target.First,the V-Li alloy was prepared by using thermal diffusion technique.Then,the experiment of V and V-Li alloy Hydrogen absorption and desorption under different conditions were carried out,and we performed some researches on the influence of Hydrogen absorption capability to Vananium.Finally,we did some tests on the experiment samples.We did X-ray diffraction(XRD)analyse for the phase-structure of samples,scanning electron microscope(SEM)analyse for the shape of exterior, secondary ion mass spectroscopy(SIMS)analyse for the comparative content.The results we obtained as following:(1)Both Vanadium and V-Li alloy absorbing Hydrogen under same pressure and different temperature,the maximum Hydrogen desorption and the release velocity increase with increasing temperature.Both Vanadium and V-Li alloy, absorbing Hydrogen in the same temperature and different pressure,the maximum Hydrogen desorption increase with increasing pressure.Absorbing Hydrogen in the same condition,the maximum Hydrogen desorption of V-Li is more than Vanadium.(2)The XRD analyse reveals that the phase-structure of pure Vanadium is body centered cubic(BCC).It turns into face eentured cubic(FCC)after absorbing Hydrogen.Body centered tetragonal(BCT)and FCC coexist after desorbing Hydrogen.After absorbing and desorbing Hydrogen,the lattice parameter of Vanadium increases,so does the lattice volume.The peak of Lithium and LiH appear in the picture of XRD,which is proved that Lithium diffusing in Vanadium successfully.(3)By SEM analyse,it's compact and flawless for Vanadium before absorbing Hydrogen.There are many flaws after absorbing and desorbing Hydrogen.It's observed that the flaw pulverize badly by high degree miscoscope.It can be concluded that the shape of sample pulverize badly and appear some passages for Hydrogen after absorbing and desorbing Hydrogen.(4)By SIMS analyse,the depth of Hydrogen in Vanadium is more than 2.7μm,it meets the need of Tritium target's depth,so it can be used for Tritium target.