The manufacturing method of multi-element niobium alloy ingot, the method adds aluminum powder, heating agent, lime, alloying element powder and rare earth element to metallurgical grade niobium oxide powder, after mixing and furnace thermite reduction reaction, the metal is separated from the slag, and then the reduced metal is melted into plate, cylindrical or other forms of ingots by electron beam furnace, and then some zirconium or other metals are added. The niobium alloy ingot was prepared by two vacuum electron beam furnace smelting or one vacuum electron beam furnace + one vacuum consumable arc furnace smelting. The invention greatly reduces the production cost of niobium base alloy and has good development prospect, and the niobium alloy produced by the method has the characteristics of low cost, short production cycle, high yield, excellent alloy performance and so on.
As a symbol of a country's military and technical strength, it has great military and political influence. As an important part of the advanced defense system, the kinetic energy kill interceptor and the corresponding missile delivery system also put forward higher requirements for the attitude control engine, which not only pursues high temperature performance, long service time, low material density, but also has good welding performance and other advantages. Niobium metal has become the preferred material in this industry because of its good plasticity and high melting point, and it can be strengthened by adding W, Mo, Ta, V, Cr, Zr, C, Ti, Ni, Hf and other elements to achieve solid solution strengthening, precipitation strengthening, dispersion strengthening to improve the room temperature and high temperature properties of the alloy. In addition, because the metal niobium has the lowest density among refractory metals, the price is cheap, and the niobium base alloy has the advantages of good welding performance, so the niobium base alloy is naturally the best material in the field.
The proportion of aluminum powder, heating agent (saltpetre, potassium perchlorate, potassium chlorate, etc.), lime in metallurgical grade niobium oxide, while adding a certain amount of alloying element powder, such as tungsten, molybdenum, tantalum, vanadium, chromium and their corresponding oxides of one or several, while adding rare earth element powder, with mixing machine for full mixing; The rare earth elements are any one or several of yttrium, terbium, dysprosium, holmium, erbium, thulium, ytterbium and lutetium. The addition amount of the above rare earth elements is adjusted according to the weight of niobium oxide, usually 0.1-0.2% of the weight of niobium oxide, after a certain amount of niobium oxide, aluminum powder exceeds 1-10% of the stoichiometric value, the addition amount of heating agent and lime is 5-15% of the amount of niobium oxide, and other alloying elements can be added according to the stoichiometric value calculated by the theoretical value of the alloy.
