Round wire preparation method of REBCO stacked conductor and rolling die

Abstract

The invention belongs to the technical field of high-temperature superconduction, and particularly relates to a round wire preparation method of an REBCO stacked conductor and a rolling die. The strips are stacked to form a square conductor, the coating material is pre-rolled, rolling is carried out again after preliminary rolling forming, a rolling die body is a cylinder, a rolling structure is machined in the middle of the outer side of the rolling die body, and the rolling structure is three parallel grooves machined in the circumferential direction of the middle of the cylinder. The rolling die is suitable for preparing REBCO stacked conductor round wires, rectangular REBCO multilayer stacked conductors are wrapped and packaged into round conductors, and therefore the rolling die is applied to winding of various high-temperature superconducting magnets such as fusion reactor magnets, accelerator magnets, detector magnets, beneficiation magnets, motors and transformers, the mechanical strength of wrapping materials is reduced through temperature rise, and the method is more suitable for the temperature-sensitive characteristic of the second-generation high-temperature superconducting strip.

Description

technical field [0001] The invention belongs to the technical field of high-temperature superconductivity, and in particular relates to a method for preparing round wires of REBCO (second-generation high-temperature superconductivity) stacked conductors and a rolling die. Background technique [0002] High-temperature REBCO strips have much higher operating temperature and critical magnetic field than low-temperature superconductors, providing a better choice for building high-field magnets, such as fusion reactor magnets, accelerator magnets, and detector magnets. REBCO high-temperature superconductor is a strip-shaped multi-layer composite material. The current-carrying capacity of a single strip is limited. In order to meet the requirements of high-current applications, multiple REBCO strips need to be used in parallel. The ribbon structure makes it impossible for REBCO tape to be twisted like traditional cables, so it needs to be rounded after being wound on a circular m...

AI Technical Summary

Problems solved by technology

[0004] The existing methods for preparing REBCO conductors into circular shapes mainly include: wrapping filaments or thin strips (copper wire, copper foil, aluminum foil, solder wire, etc.), which has low preparation efficiency and low mechanical strength; , Welding after wrapping the semi-circular cladding, sealing and welding with filled arc-shaped materials, requires thicker cladding materials, and the engineering current density is low

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