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 Ti 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.
The hydrogen storage alloys of TiFe series were prepared by high stability CaO and modified calcium oxide refractory crucible melting. But the melting point of TiFe hydrogen storage alloy is only about 1300℃, while the melting point of vanadium-titanium hydrogen storage alloy is about 1600℃. The maximum use temperature of the commercially available CaO crucible is 1600℃, and the maximum number of uses at 1500℃ is about 20 times. Obviously, the melting point of the vanadium-titanium hydrogen storage alloy is very close to or has exceeded the maximum operating temperature of the crucible, and the use of the crucible to melt the alloy will still cause the reaction between the alloy and the crucible or the crucible cracking.
Aiming at the problems existing in the preparation process of vanadium titanium base hydrogen storage alloy, a high uniformity vanadium titanium base hydrogen storage alloy and its preparation method are provided. The invention adopts vacuum induction suspension melting technology and improves the original melting technology. The improved process can not only avoid serious alloy burning loss and crucible corrosion caused by high melting temperature of alloy in conventional melting method, but also has the function of alloy purification in the preparation process. The prepared alloy is a high-purity alloy and can effectively inhibit macro-component segregation. Not only overcome the shortcomings of vacuum induction suspension melting technology, but also solve the defects of conventional melting method, and the technical advantages are obvious.
