The invention relates to the preparation method of high niobium titanium alloy homogeneous ingot, which includes the following steps: 1. Niobium scrap is crushed to obtain niobium scrap, and vacuum annealing is performed; 2. Two, the vacuum annealed niobium debris and sponge titanium mix, get the mixture; Thirdly, the mixture and titanium sponge are distributed and pressed successively in the mold to obtain the electrode block; 4. Weld the electrode block to obtain the electrode rod; 5. The electrode rod was smelted by vacuum consumable arc to obtain homogeneous ingot of high Nb alloy. The mass percentage of niobium in the homogeneous ingot of high niobium titanium alloy prepared by the invention is not less than 40%, realizing the effective preparation of niobium titanium alloy with high content of refractory metal niobium. In the homogeneous ingot of high niobium titanium alloy prepared, the alloy composition is evenly distributed, the fluctuation is small, and there is no niobium inclusion and other defects. The homogenized ingot with high niobium alloy can satisfy the requirement of composition distribution uniformity in industrial production.
Aiming at the shortcomings of the existing technology, a method for preparing high niobium titanium alloy homogeneous ingot was presented. In this method, the niobium debris from the niobium scrap is used as the source of niobium. By controlling the particle size of niobium debris, the parameters of vacuum annealing treatment, the mass ratio of niobium debris and sponge titanium in the mixture, and the cloth method, the niobium drop in the smelting process can be avoided, which is beneficial to the uniform distribution of niobium in the high niobium titanium alloy homogeneous ingot. The mass percentage of niobium in homogeneous ingot of high niobium titanium alloy prepared by the invention is not less than 40%, the distribution of each alloy component is uniform, the fluctuation is small, and there is no niobium inclusion and other defects, which can meet the requirements of the distribution uniformity of high niobium titanium alloy homogeneous ingot in industrial production.
The above preparation method of a high niobium titanium alloy homogeneous ingot is characterized in that the niobium scrap in step 1 is the scrap produced during the processing of the niobium scrap, the particle size of the niobium scrap is less than 3mm, and the vacuum annealing treatment conditions are: the vacuum degree is less than 5×10-2MPa, the temperature is 800℃ ~ 850℃, and the time is not less than 30min. The invention adopts the scrap produced during the processing of niobium as the source of the invention's niobium, which has the advantages of low cost and easy to obtain. The niobium debris with particle size less than 3mm is adopted. In the mixing process, the niobium debris will not aggregate, realizing the uniform distribution of niobium in the mixture, avoiding the inclusion and component segregation in the smelting process. The vacuum annealing treatment conditions of the invention are: When the vacuum degree is less than 5×10-2MPa, the temperature is 800℃ ~ 850℃, and the time is not less than 30min, the niobium debris can be softened and have higher ductability. After the pressing treatment, the niobium debris can be uniformly bonded to the surface of sponge titanium, which ensures that no niobium will fall off during the smelting process. The vacuum annealing treatment can also effectively remove the chip liquid or oil stain contaminated by niobium debris in the crushing process.
