Study Of Hydriding Combustion Synthesis Mg-Ni Hydrogen Storage Alloy And Doping For Improving Its Performance

Hydrogen storage materials are new functional materials developed with the deepening of energy crisis and the strengthening of environmental protection consciousness. Among common hydrogrn storage alloy, magnesium based alloy is the only one with more than 3.0wt% hydrogen storage. So magnesium based alloy is regard as the most promising hydrogrn storage materials for fuel cell and hydrogen burn automobile applications. Therefore magnesium based alloy is the hot research area at various countries in recently years.In this thesis, the recently developed hydriding combustion synthesis(HCS) technology was used. With XRD, DSC-TG , SEM and other meseament methods, the author has carried out the following systematically researches, including: hydriding combustion synthesis technical parameters and affection of different preparation methods and nickel content for HCS preparing magnesium nickel hydrogen storage alloy; affection of titanium, lanthanum and copper doping on the preparation technical parameters; calculating of the change of the lattice parameters of magnesium nickel alloy after doping by using Cellcalc method; discussion of the reasons and mechanism for doping affections to magnesium nickel alloy which deduces the hydrogen releasing temperature and improving dynamics properties; using magnesium belt as raw materials (prepraring 50μm thickness magnesium sheet) for testing the hydrogen storage properties of the sheet after surface flouridization; chemical plating magnesium sheet with nickel, and then preparing magnesium nickel alloy sheet, and studing its hydrogen storage properties and etc. The research results indicate that when hydrogen pressure is 2Mpa, synthesis temperature is 620℃, and holding time is 90mim, the samples directly synthesized by hydriding combustion synthesis with magnesium powders and nickel powders as raw materials having the dehydriding content about 2.39 wt %; when the mole ratio of Mg:Ni: Cu is 2:0.75:0.25, and the synthesis condition under hydrogen pressure is 2Mpa, synthesis temperature is 600℃, and the holding time is 4hr, dehydriding content of...