The Study Of Hydrogen Absorption And Desorption Effect Of Sevsral Metal And Their Lithium Alloys

Titanium,Zircouium and vanadium-based solid solution Hydrogen storage alloys become studying hotspot because of their high Hydrogen storage capacity and high velocity of Hydrogcn absorption and desorption.Titanium,Zirconium and vanadium have the properties of high Tritium storage density,high temperature of desorbing Hydrogen,strong ability of keeping Helium and low rate of droping powder, it meets the need of neutron generator's Tritium target,thus it can be used for Tritium target.The first time,we prepared the Ti-Li,Zr-Li and V-Li alloy were prepared by using thermal diffusion technology.And then,we did the experiment of Ti,Zr andV and Ti-Li,Zr-Li andV-Li alloy Hydrogen absorption and desorption under different conditions,and we did some research 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 get as following:(1) Both Titanium,Zirconium and Vanadium and Ti-Li,Zr-Li andV-Li alloy,absorbing Hydrogen in the same pressure and different temperature,the maximum Hydrogen desorption and the analytic velocity increase with the increasing of temperature.Both Vanadium and V-Li alloy,absorbing Hydrogen in the same temperature and different pressure,the maximum Hydrogen desorption increase with the increasing of pressure.Absorbing Hydrogen in the same condition,the maximum Hydrogen desorption of Li allay is more than Titanium,Zirconium and Vanadium.(2) The XRD analyse reveals that the structure of Titanium before hydrogen-absorption is close-packed hexagonal,the TiH₂ that formed via hydrogen-absorption is body-centered tetragonal,and the TiH that formed due to hydrogen-desertion of TiH₂ is cubic.The phase-structure of pure Vanadium is body centered cubic.It turns into face centured cubic after absorbing Hydrogen. It's body centered tetragonal and face centured cubic coexist after dcsorbing Hydrogen.After absorbing and desorbing Hydrogen,their lattice parameters increas,and the lattice volumes also increas.The peak of Lithium and LiH appear in the picture of XRD,which is proved that Lithium diffusing 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 Titanium,Zirconium and Vanadium is more than 1.2μm,2.8μm and 2.7μm,it meets the need of Tritium target's depth,so they can be used for Tritium target.