41 results about "Iron-based superconductor" patented technology

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.

The invention relates to a processing technology for improving performance of a Fe-based compound superconductive tape. The processing technology for improving performance of a Fe-based compound superconductive tape includes the steps: preparing Fe-based superconductor precursor powder; filling a sheath with the precursor powder to obtain a tube-loading composite; drawing the tube-loading composite into a single-core wire; cutting the single-core wire into a plurality of identical short samples, inserting the identical short samples into the outer sheath to obtain a multi-core composite tube;after the composite tube is drawn into a wire of a certain diameter, repeatedly rolling the wire (during the rolling process, the two ends of the samples are bitten into the roller in turn), and thenobtaining a multi-core tape with certain thickness; and under an Ar atmosphere at 500 to 1100 DEG C, performing final thermal treatment on the obtained Fe-based multi-core tape. Compared with a multi-core tape obtained by a unidirectional rolling technology, the multi-core tape obtained by the processing technology for improving performance of a Fe-based compound superconductive tape through the repeated rolling mode has no cracking phenomenon in each superconductive core of the multi-core tape, and the integrity of the superconductive core is preferable, and the critical transmission currentIc of the tape and the critical engineering current density Je of the tape are significantly improved.

An iron-based compound superconducting joint, the superconducting joint includes a connected iron-based superconductor, iron-based superconducting powder and a metal sheath. The ends of the connected superconductors are filled with iron-based superconducting powder and wrapped by a single-layer or multi-layer metal sheath. The preparation steps of the superconducting joint are as follows: (1) peel off the non-superconducting layer on the surface of the iron-based superconductor end to be connected to expose the superconducting core; (2) remove the iron-based superconductor end treated in step (1) Fill the iron-based superconducting powder between them, and wrap the iron-based superconductor end and the iron-based superconducting powder with a metal sheath at the same time; (3) Welding step (2) The processed metal sheaths, or does not need to be welded; (4) Apply pressure , reducing the cross-section of the metal sheath prepared in the above step (3); (5) during or after applying pressure, the metal sheath prepared in the above step (4) is subjected to heat treatment, or heat treatment is not necessary. The invention is very suitable for making superconducting joints at engineering sites.

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.

A preparation method for a silver-doped iron-based superconductor belongs to the technical field of iron-based superconductive materials. The preparation method includes the following steps: under argon shield, rare earth and As powder are packaged in a quartz tube and heated to prepare LnAs powder; in a glove box with argon shield, LnAs and Fe powder, Fe2O3 powder and FeF3 powder are blended according to the molar ratio of 3:(1 plus x):(1 minus x):(1.1 to 1.5)x (x is greater than 0 and less than 0.6), silver is added, and the materials are ground and pressed into the shape of a sheet; annealing is carried out under high vacuum, more specifically, the heating rate is 1 DEG C / min to 5 DEG C / min from 0 DEG C to 600 DEG C, the heating rate is 1 DEG C / min to 3 DEG C / min from 600 DEG C to 900 DEG C, the temperature of 900 DEG C is kept for 5 to 15 hours, the heating rate is 1 DEG C / min to 3 DEG C / min from 900 DEG C to a temperature from 1100 DEG C to 1200 DEG C, and the temperature from 1100 DEG C to 1200 DEG C is kept for 20 to 30 hours; and the furnace is cooled to the room temperature. By adding the silver, the method can enhance the electromagnetic properties and practicability of the iron-based superconductor.

The invention relates to a method for improving the superconducting performance of a Sn-added FeSe0.5Te0.5 superconductor. The method comprises the steps of mixing Sn powder and FeSe0.5Te0.5 powder in a weight ratio of 0.05: 1, and sufficiently grinding the mixture in an agate mortar for 20-30 minutes; and then preparing into a flake under the pressure of 6-8MPa, finally putting the flake into a high-temperature differential scanning calorimeter, heating to 600 DEG C under the protection of flowing high-purity argon, preserving the heat for 5-10 hours, and cooling to room temperature. A fact that a Sn-Se-Te liquid phase generated by reaction between Sn and FeSe0.5Te0.5 can accelerate the transformation from a non-superconducting phase to a superconducting phase is discovered for the first time and is favorable for forming a superconducting laminar structure so that the superconducting transition temperature of the structure is finally significantly improved, thus providing an important clue for optimizing a preparation process of an iron-based superconductor, illuminating an iron-based superconducting mechanism and promoting the development of the superconducting theory.

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 an iron-based superconducting coil, a preparation method thereof, 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 joints; The iron core, on which the iron-based superconducting wire is wound, has a non-closed cross-section. In the iron-based superconducting coil, its preparation method and the method for measuring the resistance of the iron-based superconducting joint in the embodiments of the present invention, the iron-based superconducting wire is wound on the iron core, and the cross-section of the iron core is an open shape. The two ends of the superconducting wire are connected by joints, and the iron-based superconducting coil is prepared, which realizes the closed-loop operation of the iron-based superconductor, and by setting the cross-section of the iron core to a non-closed shape, the iron-based superconducting coil, when in use, The iron core itself does not generate a magnetic field, so it does not affect the magnetic field generated by the iron-based superconducting coil, so that the prepared iron-based superconducting joint can be used to accurately measure the resistance of the iron-based superconducting joint.