The invention relates to a preparation method of multi-component niobium alloy ingot, which includes the following steps: 1. Weighing the raw materials according to the composition of the multi-component niobium alloy ingot to be prepared; 2. 2. Preparation of alloy packets; Three, the alloy is placed in the sponge matrix metal medium pressure to make a semi-circular ring electrode; 4. Weld the two electrodes into a complete electrode; Five, smelting to obtain multi - component niobium alloy ingot. The invention has the advantages of simple preparation process, low cost and convenient production organization, can greatly improve the industrial production efficiency of such niobium alloy ingot, and is suitable for the preparation of all kinds of binary system and multi-system niobium alloy ingot containing low melting point and low density components.
Studies on alloys show that a multi-body-centered cubic solid solution strengthened Nb-Ti-Al alloy has good comprehensive properties, such as low density, no magnetic field, moderate temperature strength (1100°c), good corrosion resistance, oxidation resistance and easy welding. It has become a candidate material for medium temperature structural parts. It plays a very important role in the development of aerospace technology, weapon equipment and civil industry.
This kind of alloy contains a large number of titanium and aluminum elements, and a small amount of zirconium, vanadium, chromium, carbon and other elements. Compared with niobium, these elements have low melting point and small specific gravity, so it is easy to produce unmelted niobium block or niobium-rich zone in the ingot during smelting, which forms serious metallurgical defects and affects the subsequent processing and product quality. At present, there are two kinds of melting technology for this kind of alloy, one is using vacuum plasma cold bed furnace melting; The other is to prepare the alloying elements as intermediate alloys, add them to the electrode block, and melt them in the vacuum consumable arc furnace.
Compared with the existing technology, it has the following advantages: The raw materials of the invention except niobium are all low melting point and low density metal particles. In the preparation process of the invention, each element of the alloy can be melted, and the melt of each component is fully mixed in the vacuum consumable electric arc furnace to avoid the formation of non-melting blocks. The preparation process is simple, the cost is low, the production organization is convenient, and the industrial production efficiency of this kind of niobium alloy ingot can be greatly improved. It is suitable for the preparation of binary and multivariate niobium alloy ingot with low melting point and low density components.
