The forging method of the superconducting tantalum rod is characterized by the following steps: (1) take the superconducting tantalum ingots as raw materials, preheat them at 150 ~ 180℃, hold them for 20 ~ 40 minutes, and then take out the heated tantalum ingots, evenly coat the surface with an antioxidant coating thickness of 2 ~ 3mm, and then let them dry naturally; Then heating, heating temperature 450 ~ 500℃, holding time 210 ~ 240 minutes after taking out; (2) the first radial pier is thick and the first radial pull-out length; (3) the second radial pier is thick, and the second radial pull-out length; (4) The third radial pier is thick, stop forging, air cooling for 5 to 10 minutes, and the third radial length can be drawn. By forging tantalum ingots used for superconducting products and combining with appropriate hot forging heating process, the method of the invention can obtain a structure whose grain size grade and cross section organization uniformity meet the requirements of early organization preparation.
At present, almost all superconductors in the field of electromagnetic applications are composed of NbTi alloy and Nb3Sn composite, and the main applications of NbTi and Nb3Sn superconductors are classified into: strong current applications, weak current applications and strong magnetic field and magnetic shielding applications. The application of strong current is mainly in the preparation of superconducting cable for energy transmission by multi-core superconducting composite wire, which has epoch-making significance for the reduction of energy loss in the process of energy transmission, as well as superconducting energy storage and superconducting power generation applications.
Tantalum rod for superconducting is the key and important component in the production of multi-core superconducting composite wire, which is mainly used as the lining support in the extrusion composite. The deformation uniformity of tantalum core support body of multi-core superconducting wire lining is very important for the end product, which depends on the grain grade range of tantalum lining support body and the average grain size fluctuation range of bar cross-section. The smaller and more uniform the grain size, the more regular the deformation of tantalum core support body. After processing to the fine-diameter superconducting wire, the lining tantalum core support body shows a more perfect circular cross-section.
The existing technology mainly adopts hot forging processing, which has a low processing rate per pass and a low total processing rate. The cast structure of the forging blank obtained by this forging process has a low crushing degree, and the internal bad structures are not completely eliminated, which leads to irregular deformation of the lining tantalum support body in the subsequent superconducting wire processing, and the position of the superconducting wire mass is compressed. It is unacceptable to affect the superconducting properties and the quality problems such as broken wires in the production of high-cost superconducting wires.
