The invention relates to a preparation method of nickel-molybdenum intermediate alloy used for smelting TA10 ingot. The pure nickel rod and molybdenum rod are respectively turned into chips and heated and dried. The dried masterbatch nickel chips are added to the crucible of the medium frequency induction furnace, and the molybdenum chips are added to the secondary feeding hopper in the medium frequency induction furnace. Then, when the medium frequency induction furnace is vacuumed to 0.6 ~ 0.1Pa, heating and melting begins; Heat up to 1800℃-1900℃, heat preservation 15-20 minutes, observe when the master nickel chip melting rate exceeds 45%, start to add molybdenum chips, filled with argon gas protection, continue to heat up to ensure that the temperature reaches 1900℃, heat preservation 20-30 minutes, so that the impurities in the molten liquid fully float to the surface of the molten pool; Finally, the solution is cast into a fixed mold and cooled to room temperature. The invention directly prepares pure nickel and pure molybdenum into an intermediate alloy, reduces the melting point of the nickel-molybdenum alloy, and makes up for the shortcomings of adding intermediate alloys in the traditional smelting of TA10 ingot.
Intermediate alloy as an important additive in the metallurgical industry, its role is to melt the alloy with a large melting point difference, the prefabricated standby intermediate alloy is lower than the melting point of the pure element, to ensure that the added element phase melting. In the traditional smelting of TA10 ingots, Ti-32Mo, pure nickel strips or nickel chips are generally added to carry out element balance. Throughout the entire addition process, there are the following drawbacks: 1, the addition of pure metal elements, there is bound to be segregation, the addition of nickel strips or nickel chips, the density of nickel is larger, can not guarantee its fluidity, so it will cause local or microscopic segregation, strict requirements for artificial fabric process; 2. Ti-32Mo intermediate alloy is generally prepared by vacuum consumable furnace. As the consumable furnace temperature rises to a certain extent, Mo itself has high melting point and high density, which is very different from the melting point and density of titanium sponge, so the phase melting ability is very poor during the preparation process, and the degree of segregation can be expected. Therefore, even if the cloth control is even, it can not avoid micro-segregation. The cloth process of the above method is difficult, because it needs to be added twice to meet the requirements of alloy composition, so the responsibility of the operator, man-machine efficiency and so on have put forward higher requirements, so it is necessary to improve.
