The preparation method of niobium-titanium-aluminum alloy ingots, which includes: First, crushing the niobium-titanium ingots to obtain niobium-titanium chips, and then acid washing and vacuum annealing treatment to obtain pre-treated niobium-titanium chips; Second, some of the pre-treated niobium-titanium debris was mixed with sponge titanium to obtain mixture A, and the remaining pre-treated niobium-titanium debris was mixed with aluminum-niobium alloy and other master alloys to obtain mixture B. Three, mix mixture A as the upper and lower layers and Mixture B as the middle layer to fabricate and press to obtain the electrode block. Four. Electrode blocks are assembled and welded to obtain electrode rods. Five: The electrode rod undergoes three vacuum consumable arc melting processes. The present invention adopts niobium-titanium chips and conducts pretreatment. Combined with the design of the mixing and pressing distribution method of niobium-titanium chips with other raw materials, it avoids the micro-area segregation and inclusions of Nb elements and the loss of Al elements, improves the uniformity and content accuracy of alloy composition in niobium-titanium-aluminum alloy ingots, and meets the requirements of industrial production.
Firstly, the niobium-titanium chips are pre-treated by acid washing to remove surface oxide impurities. Combined with vacuum annealing treatment, the niobium-titanium chips are softened to have higher ductility and the content of some gaseous impurity elements such as O, N, and H in the niobium-titanium chips is reduced. At the same time, the oil stains and adhering cutting fluids on the surface of the niobium-titanium chips are further removed. Obtaining niobium-titanium debris with a lower content of impurity elements is conducive to the subsequent process of pressing electrode blocks. Secondly, the present invention uses niobium-titanium debris and aluminum-niobium alloy as the raw materials for the niobium element in the niobium-titanium-aluminum-based alloy ingot of the target product.
