The preparation method of wide plate barrier layer niobium sheet for superconducting wire is characterized in that the equipment used for the first rolling process in step 1 is 800mm four-high reversible hot rolling mill; The equipment used for the second rolling process in step 2 is 800mm UCM cold rolling mill. As a typical rare metal material with high melting point, niobium and niobium alloys have high temperature tensile strength equivalent to that of some steels at room temperature. Therefore, niobium and niobium alloy have much greater deformation resistance than other metal materials during hot rolling. In the process of deformation of niobium and niobium alloy in cold rolling, due to rapid work hardening, deformation resistance increases rapidly, rolling equipment carries huge compressive stress in the rolling deformation process, resulting in large elastic deformation and accelerated friction loss, which makes the rolled parts easy to produce uneven deformation, resulting in rolled parts edge cracking and different sizes. The optimized equipment has the advantages of high roll hardness, strong plate shape control ability and high dimensional accuracy, and can effectively realize the rolling with large deformation rate and the rolling effect is good.
The preparation method of a wide plate barrier layer niobium sheet for superconducting wire is characterized in that the tension value of the band tension rolling is 30kN ~ 60kN. The optimum rolling tension value can effectively reduce the deformation resistance of niobium plate, and ensure the flatness of the wide plate barrier layer niobium plate to obtain a good plate shape. The preparation method of a wide plate barrier layer niobium sheet for superconducting wire is characterized in that the wide plate barrier layer niobium sheet is flat without waves, the surface is smooth and smooth, and there are no defects such as scratches, pits, oxidation, inclusions, etc.
The wide plate barrier layer niobium sheet is applied to the superconducting wire after stretching, the core wires are arranged neatly, the deformation is uniform, and the phenomenon of uneven core wire thickness does not appear, so that the length of the wire is more than 10000m, which ensures the excellent superconducting properties of the niobium sheet in the superconducting device. This paper solves the problem of uniform wide plate niobium plate, which cannot be followed up by current technology and is required by scientific research in superconducting large science devices, fills the domestic gap of wide plate niobium plate for superconducting cavity, and produces wide plate barrier layer niobium plate for drawing superconducting wire with a diameter of 100 microns for superconducting large science devices.
