Method for preparing iron-based superconducting wire
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An iron-based superconducting and wire technology, which is applied in cable/conductor manufacturing, electrical components, circuits, etc., can solve the problem of reducing the transmission performance of wires
Active Publication Date: 2013-10-16
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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Although the rolling process in the machining process can increase the density of the wire superconducting core to a certain extent, many cracks will be generated inside the superconducting
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Embodiment 1
[0020] Put the powder of LaFeAsOF (La-1111) into the Nb tube, and the structure of the single-core iron-based strip after swaging, drawing and rolling is as follows Figure 3a As shown, after sealing the two ends of the above-mentioned strips separately, put them into high-temperature and high-pressure equipment, such as figure 1 shown. Pressurize to 10MPa at room temperature, then heat up to 500°C and keep warm for 20 hours, then cool down to room temperature, such as figure 2 shown. Take out the sample to make iron-based superconducting wire. During the high-pressure process, the pressure is always kept at 10MPa, and the high-pressure gas introduced into the high-pressure heat treatment process is argon.
Embodiment 2
[0022] Put the powder of LaFeAsOF (La-1111) into the Nb tube, and the structure of the single-core iron-based wire after swaging and drawing is as follows: Figure 3b As shown, after the two ends of the above-mentioned wires are sealed, they are put into high temperature and high pressure equipment. Pressurize to 10MPa at room temperature, then heat up to 500°C and keep warm for 20 hours, then cool down to room temperature, such as figure 2 shown. Take out the sample to make iron-based superconducting wire. During the high-pressure process, the total pressure is always maintained at 110MPa, and the high-pressure gas is argon.
Embodiment 3
[0024] Put the powder of LaFeAsOF (La-1111) into the Nb tube, and obtain a 7-core wire rod after swaging and drawing. After sealing the two ends of the wire rod, put it into a high-temperature and high-pressure equipment. First pressurize to 200MPa at room temperature, then raise the temperature to 600°C and keep it warm for 20 hours, then cool down to room temperature, take out the sample, and then make the iron-based superconducting wire. During the high-pressure process, the total pressure is always maintained at 200MPa, and the high-pressure gas is argon.
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Abstract
The invention relates to a method for preparing an iron-based superconducting wire. The method comprises the steps of: (1) putting iron-based superconducting precursor powder into a metal tube under an inert atmosphere, and processing the iron-based superconducting precursor powder into an iron-based wire or strip through rotary forging, drawing and rolling; (2) carrying out sheathing and sealing processing on the iron-based wire or strip prepared in the step (1), that is, two ends of the iron-based wire or strip are sealed by silver foil pressing or argon arc welding; (3) carrying out heat treatment on the sealed iron-based wire or strip acquired in the step (2) so as to acquire the iron-based superconducting wire, wherein the temperature of the heat treatment is 500-950 DEG C, the pressure is 1-300MPa, and the time of the heat treatment is 1min-200hr; and (4) feeding a gas medium in the heat treatment process of the step (3), wherein the gas medium is argon. The prepared iron-based superconducting wire comprises at least one superconducting core with superconducting performance and at least one kind of metal substrate coated around the superconducting core, wherein the principal phase of the superconducting core is 1111 or 122 or 111 or 11.
Description
technical field [0001] The invention relates to a method for preparing an iron-based superconducting wire. Background technique [0002] Iron-based superconductor is a newly discovered high-temperature superconductor in early 2008. This discovery has caused a new wave of research on high-temperature superconductors in the scientific community. At present, its highest superconducting transition temperature has reached 55K. According to the composition ratio and crystal structure of the parent compound, the new iron-based superconducting materials are mainly divided into the following four systems: (1) "1111" system, members include LnOFeAs (Ln=La, Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Y) and DvFeAsF (Dv=Ca, Sr), etc.; (2) "122" system, members include AFe 2 As 2 (A=Ba, Sr, K, Ca, Eu), etc.; (3) "111" system, members include AFeAs (A=Li, Na), etc.; (4) "11" system, members include FeSe(Te), etc. . [0003] Compared with traditional superconducting materials, iron-based supercon...
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