Iron-based compound superconducting wire or tape prepared from silver sheath

Abstract

The invention relates to a single-core or multicore iron-based compound superconducting tape prepared from a silver sheath. The conductor core of the tape is an iron-based compound with superconducting property, and silver or silver alloy material is coated outside the conductor core. Other metals or alloy materials can also be coated outside a silver or silver alloy sheath. The superconducting tape is prepared by using a powder tubulated method comprising the following steps of: putting the initial powder of the iron-based compound into a silver tube, a silver alloy tube or a composited tube of silver and other metals; compactly filling the initial powder in the tube; after both ends of the tube are closed, swaging, drawing, rolling and processing the metal tube into wires and tapes; and then obtaining the superconducting tape by vacuum or inert atmosphere annealing. Due to the fact that a conversion zone does not exist between the superconducting core and the sheathed material after annealing and silver steam generated by the silver sheath at the temperature removes FeAs phase, the crystal grain connectivity of the iron-based superconductor is improved. The novel iron-based compound superconducting wire or tape has good current transportation property.

Description

technical field [0001] The invention relates to an iron-based compound superconducting material prepared by adopting a silver sheath. Background technique [0002] At the beginning of January 2008, Hideo Hosono’s group discovered that in the iron-based oxyphosphinic element compound LaOFeAs, replacing part of the oxygen with fluorine in the form of doping can make the critical temperature of LaO1-xFxFeAs reach 26K. This breakthrough started A new round of high-temperature superconductivity research boom in the scientific community [Kamihara Y. et al., Iron-based layered superconductorLaO 1-x f x FeAs(x=0.05-0.12) with T c =26 K.J.Am.Chem.Sco.130, 3296-3297 (2008)]. In the wave of discovery of new superconductors, Chinese scientists have occupied an important position and discovered a series of representative iron-based superconductors with high critical transition temperatures. [0003] Iron-based superconductor is a newly discovered high-temperature superconductor, and ...

AI Technical Summary

Problems solved by technology

At present, the work of preparing iron-based superconductors into wire strips has also been carried out, but the iron, niobium, tantalum and other sheathing materials used will react with the superconducting core after high-temperature annealing, and the superconducting core will react with the sheathing material and superconducting core. A reaction layer is formed between them, which greatly hinders the transport of current in the superconducting core

In addition, the iron-based superconductors prepared by the solid-state reaction method generally have the FeAs phase, which wraps around the superconducting grains and seriously hinders the transmission of superconducting current between the grains.

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