The method of preparing high Cu ratio NbTi/Cu superconducting wire by Mosaic welding is as follows: selecting the low Cu ratio NbTi/Cu multi-core superconducting round wire, and machining the U-shaped copper groove wire with groove width and groove depth matching the size of the superconducting round wire; The selected multi-core superconducting round wire with low copper ratio NbTi/Cu and the processed U-shaped copper groove wire are cleaned and blown dry, set together by the mold, and then immersed in the tin groove for welding, the excess tin is scraped off by the tin scraper, and cooled to room temperature, that is, a high copper ratio NbTi/Cu superconducting wire with a copper ratio of no less than 7:1 is prepared. The invention can prepare NbTi/Cu superconducting wire with copper ratio greater than 7:1, the processing process can reduce the processing cost of copper, and then effectively reduce the cost of high copper ratio NbTi/Cu superconducting wire, and is suitable for large-scale mass production of high copper ratio NbTi/Cu superconducting wire.
At present, NbTi superconductors are mainly used in magnetic resonance imaging (MRI), nuclear magnetic resonance (NMR), laboratory instruments, particle accelerators, electric power, mine sweeping, ore magnetic separation, magnetic levitation train, superconducting energy storage (SMES) and other fields. The preparation of traditional NbTi/Cu multi-core superconducting wire generally includes alloy preparation, alloy rod processing, multi-core complex combination and processing, heat treatment of multi-core superconducting wire, etc. Due to the complex process and high cost, the copper ratio of the prepared NbTi/Cu multi-core superconducting wire is generally controlled below 4. However, for some fields such as magnetic resonance imaging (MRI) systems below 3T, the NbTi superconducting magnets used need high stability, and the copper ratio is one of the main factors affecting their stability. The higher the copper ratio, the better the stability. Therefore, the preparation of NbTi/Cu multi-core superconductors with copper ratio higher than 7:1 is very important for obtaining highly stable NbTi superconducting magnets. The purpose of this paper is to provide a method for preparing high Cu ratio NbTi/Cu superconducting wire by Mosaic welding, which solves the problem of complicated processing process in the preparation of high Cu ratio NbTi/Cu superconducting wire by existing processing methods.
The technical scheme of the invention is a method for preparing high copper ratio NbTi/Cu superconducting wire by Mosaic welding method.
