41 results about "Iron-based superconductor" patented technology

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.

The invention relates to a method for preparing an iron-based superconductor, which comprises the following steps of: firstly, charging an iron wire or a metal strip after cleaning into a reaction chamber of a controllable atmosphere heating furnace; secondly, charging Se (Selenium) powder or Se blocks into the reaction chamber, cleaning the reaction chamber for 1 to 5 times by using high-purity argon gas or hydrogen gas, sealing the reaction chamber, raising the temperature to 200-700 DEG C, and holding the temperature for 5 minutes to 10 hours; thirdly, raising the temperature to 800-1,000 DEG C, and holding the temperature for 1 to 20 hours; fourthly, reducing the temperature to 500-200 DEG C, and holding the temperature for 1 to 24 hours; and fourthly, cutting off a heating power supply, cooling to the room temperature, and obtaining the FeSe (Ferrum-Selenium) superconductor.

A preparation method for an iron-based super conductor belongs to the technical field of iron-based super conducting materials. A1-xBxFe2As2 (A=Ba, Sr, Ca, Eu, and B=K, Na) and AFe2-xBxAs2 (A=Ba, Sr, Ca, Eu, and B=Co, Ni, Pd, Pt, Ir, Rh, Ru) are prepared, wherein 0<x<=0.7. For the A1-xBxFe2As2, FeAs is prepared first, then AFe2As2 and BFe2As2 are prepared respectively, and the FeAs, the AFe2As2 and the BFe2As2 are mixed and sintered to obtain the A1-xBxFe2As2. For AFe2-xBxAs2, FeAs and BAs are prepared first, then AFe2As2 and AB2As2 are prepared respectively, and the FeAs, the BAs, the AFe2As2 and the AB2As2 are mixed and sintered to obtain the AFe2-xBxAs2. A reacting process can be controlled by means of step reaction, generation of an impure phase is reduced, electromagnetic performanceof the iron-based super conductor is improved, and practicality is improved.

Provided is an iron-based superconducting material including an iron-based superconductor having a crystal structure of ThCr₂Si₂, and nanoparticles which are expressed by BaXO₃ (X represents one, two, or more kinds of elements selected from a group consisting of Zr, Sn, Hf, and Ti) and have a particle size of 30 nm or less. The nanoparticles are dispersed in a volume density of 1×10²¹m⁻³ or more.

The invention belongs to the field of novel Fe-based superconductors and particularly relates to a method for preparing a FeSeTe film by a pulse laser deposition coating technology. The method comprises the following steps: firstly, uniformly mixing and grinding Fe powder, Se powder and Te powder at a certain molar ratio; secondly, sintering the ground powder in a vacuum quartz tube at 700DEG C for 24 hours, performing quenching treatment when the sintered powder is at 400DEG C, grinding the sintered powder into powder again, pressing the powder in the size of a required target material, sintering the powder in the vacuum quartz tube at 700DEG C for 24 hours, and performing quenching treatment when the powder is at 400DEG C; adjusting laser parameters, performing pretreatment of the obtained target material, and performing film growth on a substrate within a certain time; and performing natural cooling in vacuum to obtain the required film. According to the method, the FeSeTe superconductive film is grown by utilizing the pulse laser deposition coating technology. The method has the advantages that the use is convenient, the coating speed is high, films of different components can be prepared, and the target material and the substrate are kept consistent in component more easily.

The invention relates to the technical field of iron-based superconductors, in particular to a preparation method of a composite sheathed iron-based superconducting wire strip. The preparation methodof the composite sheathed iron-based superconducting wire strip provided by the invention comprises a step of carrying out first heat treatment on iron-based superconducting precursor powder in an inert atmosphere. According to the method, the iron-based superconducting precursor powder placed into an inner sheath metal tube is subjected to pre-heat treatment in the inert atmosphere, so that bumpscan be effectively eliminated, and the product yield is improved.

The invention discloses a method for manufacturing an iron-based superconductor by using an SPS (Spark Plasma Sintering) technology and belongs to the technical field of high-temperature superconductive materials. The method comprises the following steps of: carrying out thermal treatment on rare earth powder Ln and As powder according to the ratio being 1:(1-1.1) in a high vacuum quartz tube to prepare initial powder LnAs; carrying out ball milling on LnAs and Fe powder, Fe2O3 powder and FeF3 powder according to mol ratio being 3:(1+x):(1-x):x; placing a die filled with powder into sintering equipment; manufacturing the iron-based superconductor by adopting a spark plasma sintering technology; and pressurizing and sintering at a sintering pressure of 30-50Mpa and the sintering temperature of 900-1100DEG C for 5-60 minutes under vacuum conditions. According to the method disclosed by the invention, the sintering time is short, so that the loss of component elements is reduced and the compactness of the material is reduced, thus the high-performance iron-based superconductor is obtained.

The invention discloses an iron-based superconduction connector and a fabrication method thereof. The fabrication method of the iron-based superconduction connector comprises the steps of stripping atail end of the iron-based superconductor to expose a superconduction core, connecting the superconduction core, wrapping a connection region, performing thermal processing on the connection region, and applying pressure to the connection region. In the step of thermal processing on the connection region, the connection region is arranged in a pressure-applying state within a range larger than a preset temperature, and the preset temperature is a run-off temperature of a doping component in the iron-based superconductor. The connection region is enabled to be in the pressure-applying state within the range which the thermal processing temperature is larger than the run-off temperature of the doping element in the iron-based superconductor in the step of thermal processing on the connectionregion, volatilization of the doping element of the connection region caused by that the temperature is raised and exceeds the preset temperature during the thermal processing process is prevented, the run-off condition of the doping element of the connection region is favorably controlled, and the superconduction connection efficiency is improved.

The invention discloses a method for preparing an iron-based superconductor through a short-time solid-phase sintering technology, which comprises the following steps: mixing Ln and As powder by the molar ratio of 1: (1 to 1.1) under the high-purity Ar protection atmosphere, sealing the mixed powder in a high-vacuum quartz tube for hot treatment, finally furnace cooling to room temperature to obtain LnAs powder; in a glove box protected by high-purity argon, mixing and grinding the LnAs powder, Fe powder, Fe2O3 powder and FeF3 powder by the molar ratio of 3: (1+x): (1-x): (1.1 to 1.5)x and tabletting the mixed powder; then annealing under high vacuum, furnace cooling to room temperature to finally prepare the LnO1-xFxFeAs superconductor, wherein Ln=La, Ce, Pr, Nd, Sm and Eu, and x is more than 0 and less than 0.6. The method improves the performance of the iron-based superconductor, and simultaneously improves the iron-based superconductor preparation efficiency.

The present invention discloses a novel superconducting material, which is prepared from the following main components: iron, arsenic, selenium, potassium and rare earth elements in the molar ratio of 1:0.8-1.2:0.1-0.4:0.1-0.4:0.01-0.05. The preparation method of the novel superconducting material can improve the phase purity and crystal connection performance of the iron-based superconductors.

A simple preparation method for an iron-based superconducting wire/tape belongs to the technical field of superconducting wires/tapes. Under high-purity Ar, rare earth powder and As powder are uniformly mixed in a quartz tube to prepare LnAs through heat treatment; under the protection of high-vacuum or high-purity argon gas, LnAs, Fe powders, Fe2O3 powders and FeF3 powders are matched and grinded in a molar ratio of 3:(1+x):(1-x):(1.1-1.5)x, and then are encapsulated in a copper pipe to prepare a wire/tape; the prepared wire/tape is subject to annealing processing under the high-vacuum environment of (10-4)-(10-6)Pa; and finally, the LnO1-xFxFeAs superconducting wire/tape is prepared. According to the method provided by the invention, the forming is easy, and the high-quality iron-based superconducting wire/tape can be prepared, with reduced preparation cost and improved production efficiency.

The invention belongs to the technical field of superconductors, and provides a 122 type iron-based superconductor and a preparation method thereof. According to the preparation method provided by the invention, the 122 type iron-based superconductor is Ba0. 6K0. 4Fe2As2, and the preparation method comprises the following steps: mixing an iron elementary substance and a first arsenic elementary substance, and sequentially carrying out first ball milling and first sintering to obtain a Fe2As blank; and mixing the Fe2As blank, a barium elementary substance, a potassium elementary substance and a second arsenic elementary substance, and sequentially carrying out second ball milling, pressing and second sintering to obtain Ba0.6K0.4Fe2As2. Before the Ba0. 6K0. 4Fe2As2 main phase is formed, the iron element with a high melting point and low chemical activity and a component element arsenic form chemical bonds to form a pre-reacted Fe2As intermediate product, so that iron particles are refined, the iron component is purified, the distribution uniformity of the iron component in a final superconductor is greatly improved, and the practical performance of the iron-based superconducting wire strip is further improved.

The invention belongs to the technical field of superconducting cavity preparation, and particularly relates to an iron-based thin film superconducting cavity and a preparation method thereof. The iron-based thin film superconducting cavity comprises a superconducting cavity body, an insulating layer and at least one iron-based superconducting layer, and belongs to a superconducting cavity with anSIS structure; and the iron-based superconducting layer can shield an external magnetic field, reduce a surface magnetic field of niobium, and improve a thermodynamic critical field and accelerationgradient of the iron-based thin film superconducting cavity. An iron-based superconductor has higher transition temperature, an overheat field, and wider working temperature, and is beneficial to improving the magnetic field and the acceleration gradient of the iron-based superconductor layer; when two or more iron-based superconducting layers are used, the magnetic field can be shielded by the iron-based superconducting layers for multiple times, so that the magnetic field and the acceleration gradient of the iron-based thin film superconducting cavity are improved accordingly.

The invention discloses an iron-based superconducting coil, a preparation method and a method for measuring the resistance of an iron-based superconducting joint. The iron-based superconducting coil comprises an iron-based superconducting wire, and two ends of the iron-based superconducting wire are connected through a joint; and the iron-based superconducting wire is wound on the iron core, and the cross section of the iron core is in a non-closed shape. The embodiment of the invention discloses an iron-based superconducting coil, a preparation method and a method for measuring the resistanceof an iron-based superconducting joint. An iron-based superconducting wire is wound on an iron core; the cross section of the iron core is in a non-closed shape. Two ends of the iron-based superconducting wire are connected through a joint; an iron-based superconducting coil is prepared; closed-loop operation of the iron-based superconductor is achieved, the cross section of the iron core is arranged to be in a non-closed shape, so that when the iron-based superconducting coil is used, the iron core does not generate a magnetic field, the magnetic field generated by the iron-based superconducting coil is not affected, and the prepared iron-based superconducting joint can be used for accurately measuring the resistance of the iron-based superconducting joint.