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...