Preparation method of bi-system high-temperature superconducting material

Abstract

The invention discloses a preparation method of a bi-system high-temperature superconducting material, comprising the following steps of: preparing Bi-2212 powder into a bi-system tape material by adopting a powder tubing method and a clustered drawing technology; dissolving a bonder by using methanol or ethanol as a solvent and then adding the Bi-2212 powder to mix evenly so as to obtain suspension liquid; causing the bi-system tape material to pass through a liquid trough which is loaded with the suspension liquid and then guiding the bi-system tape material to pass through a drying furnace so as to obtain a bi-system high temperature superconducting tape material which is externally coated with a superconducting film; and carrying out semi-melting treatment on the bi-system high temperature superconducting tape material which is externally coated with the superconducting film and then obtaining the bi-system high-temperature superconducting tape material after cooling with a furnace. The preparation process of the invention is simple, reasonable in design, low in manufacturing cost and large in popularization. In the invention, a layer of Bi-2212 superconducting film is added on the surface of the bi-system tape material prepared by a PIT method so that the silver hypergeometric of the tape material is decreased, the effective superconducting area is increased and the engineering current density of the bi-system tape material is improved.

Description

A kind of preparation method of bismuth series high temperature superconducting material technical field The invention belongs to the technical field of high-temperature superconducting wire preparation, and in particular relates to a preparation method of a bismuth-based high-temperature superconducting material. Background technique Because Bi-2212 high-temperature superconductor has excellent high-magnetic field current-carrying performance in the 4.2K~20K temperature range, and is the only high-temperature superconducting material that can be prepared into isotropic round wires, it is a good choice for the preparation of interpolation coils for high-field magnet systems. material of choice. At present, the preparation technology combining the powder-in-tube method (PIT) and the melting method is the mainstream technology for preparing high-performance Bi-2212 wire and strip. The technology is to put Bi-2212 powder into a silver tube, prepare a multi-core composite bo...

AI Technical Summary

Problems solved by technology

The processing process of this Bi-2212 wire and strip has certain requirements on the silver ratio. If the silver ratio (the area ratio of silver to superconducting powder on the cross section of the superconducting wire after processing) There will be serious unevenness in the material, which will affect the uniformity of the final performance of the wire strip

At present, the silver-to-silver ratio of Bi-2212 wire is generally higher than 2.5, and the silver-to-silver ratio of the strip is generally higher than 2. Because the proportion of superconducting powder is too low, it is difficult to further improve the current-carrying performance of the wire and strip.