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

A technology of superconducting wires and compounds, applied in superconducting devices, superconducting/high-conducting conductors, usage of superconducting elements, etc., can solve problems such as hindering superconducting current transmission and hindering current transport in superconducting cores. Achieve the effect of improving current transport performance, improving current transport capacity, and enhancing connectivity

Active Publication Date: 2010-05-12
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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  • Summary
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  • Claims
  • Application Information

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

Method used

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

Examples

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Effect test

example 1

[0013] First, La, Fe, As, Fe 2 o 3 and LaF 3 The powder according to the chemical formula LaO 0.9 f 0.1 The chemical ratio shown by FeAs, accurately weighed La 4.695 grams, Fe 0.781 grams, As 2.620 grams, Fe 2 o 3 1.675 g, LaF 3 0.228 g, and the powder was ground in an argon atmosphere glove box to make it fully and uniformly mixed. Put the uniformly mixed powder into a 10cm long silver tube with an inner diameter of 5mm and an outer diameter of 8mm, so that the powder can be filled and compacted in the tube, and then the two ends of the iron tube are closed, and then the mixed powder is installed. The silver tube was swaged to 4mm, and then drawn to 1mm to obtain a superconducting wire. The processed wire rod is placed in a vacuum annealing furnace, and vacuumized at room temperature until it reaches 10 -3 After the vacuum degree of Pa is filled with high-purity argon, then the temperature is raised to 500°C for 10 hours, and then the temperature is raised to 800°C ...

example 2

[0015] First Sm, Fe 2 o 3 , FeAs, As and SmF 3 The powder according to the chemical formula SmO 0.85 f 0.15 Chemical ratio shown for FeAs, accurately weighed Sm 4.800 grams, Fe 2 o 3 1.521g, FeAs 1.904g, As 1.427g, SmF 3 0.348 g, and the powder was ground in an argon atmosphere glove box to make it fully and uniformly mixed. Put the evenly mixed powder into an 8cm-long silver-iron alloy tube with an inner diameter of 6mm and an outer diameter of 7.6mm, so that the powder can be filled and compacted in the tube, then seal both ends of the silver tube, and then put the sealed alloy tube into Put it into an iron pipe with an inner diameter of 8mm and an outer diameter of 10mm, and press both ends tightly. The composite tube loaded with the initial powder was swaged to 6mm, and then drawn to 2mm to make a superconducting wire. The processed wire rod is placed in a vacuum annealing furnace, and vacuumized at room temperature until it reaches 10 -3 After the vacuum degree ...

example 3

[0017] First, Ce, Fe, As, Fe 2 o 3 and CeF 3 The powder according to the chemical formula CeO 0.8 f 0.2 The chemical ratio shown by FeAs, accurately weighed Ce 4.549 grams, Fe 0.907 grams, As 2.606 grams, Fe 2 o 3 1.481 g, CeF 3 0.457 g, and the powder was ground in an argon atmosphere glove box to make it fully and uniformly mixed. Put the powder mixed evenly into a 10cm long silver tube with an inner diameter of 6.5mm and an outer diameter of 8mm, so that the powder is full and compact in the tube, and then seal both ends of the silver tube. Put the silver tube filled with superconducting precursor powder into an iron tube with an inner diameter of 8.2 mm and an outer diameter of 10 mm, and press both ends tightly. Then the iron-silver composite tube is swaged to 3mm, and then drawn to 1mm, and processed into a wire. The processed wire rod is placed in a vacuum annealing furnace, and vacuumized at room temperature until it reaches 10 -3 After the vacuum degree of ...

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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 ...

Claims

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Application Information

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IPC IPC(8): H01B12/02C04B35/26C04B35/40
CPCY02E40/641Y02E40/60
Inventor 王雷马衍伟齐彦鹏王栋樑张志宇高召顺张现平
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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