The high homogeneity vanadium-titanium based hydrogen storage alloy and the preparation method thereof include the following steps: S1, weighing the raw material according to the composition ratio; S2. Add the raw materials with high melting point into the water-cooled copper crucible of the vacuum induction suspension melting furnace, and add the raw materials with low melting point into the feeder of the vacuum induction suspension melting furnace; S3, after the high melting point raw materials are completely melted, add the low melting point raw materials; S4, after the end of smelting, with the furnace cooling to get alloy ingot, the alloy ingot turned over and smelted again; After S5 and S4 are finished, vanadium-titanium hydrogen storage alloy ingot is obtained by casting mold. By adopting and improving the vacuum induction suspension melting technology, the invention can not only avoid serious alloy burning loss, crucible corrosion and other problems, but also has the function of alloy purification in the preparation process, which effectively inhibits the macroscopic segregation on the composition. The hydrogen absorption pressure of the prepared hydrogen storage alloy is 3-5MPa, and the reversible hydrogen storage capacity can reach 3.1wt % when hydrogen is absorbed at 0℃ and dehydrogenated at 60℃. Obvious technical advantages.
Vanadium-titanium based hydrogen storage alloy has the advantages of large hydrogen storage capacity at room temperature and fast hydrogen absorption and emission rate, and has been applied in the fields of hydrogen storage, purification, compression and hydrogen isotope separation, and has broad application prospects in the fields of fuel cell vehicle, heat energy storage and transportation, heat energy and mechanical energy conversion. At present, vanadium and titanium based hydrogen storage alloys are usually prepared by melting method, but the main raw materials of vanadium and titanium based hydrogen storage alloys, iron vanadium intermediate alloy, metal Cr, and sponge titanium have melting points as high as 1800℃, 1857℃, 1668℃ respectively, and the melting point of the alloy is also as high as 1600℃. More serious is that V and Ti have high activity at high temperatures. When melting, it is easy to react with the main components of alumina, magnesium oxide and zirconia crucible, resulting in alloy contamination and crucible damage.
