Second-generation high-temperature superconducting strip closed coil and preparation method thereof

A high-temperature superconducting tape, closed coil technology, applied in superconducting magnet/coil, coil manufacturing, inductor/transformer/magnet manufacturing, etc., can solve the problem of difficult face-to-face connection of REBCO superconducting layers

Pending Publication Date: 2022-03-22
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These two make it very difficult to connect REBCO superconducting layers face-to-face
Therefore,

Method used

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  • Second-generation high-temperature superconducting strip closed coil and preparation method thereof
  • Second-generation high-temperature superconducting strip closed coil and preparation method thereof
  • Second-generation high-temperature superconducting strip closed coil and preparation method thereof

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Effect test

preparation example Construction

[0036] In the present invention, the preparation method comprises the following steps:

[0037] (1) Wrap the second-generation high-temperature superconducting strip with insulating material, wind the second-generation high-temperature superconducting strip wrapped with insulating material into a coil, and leave both ends of the strip as joints to be connected;

[0038] (2) exposing the superconducting layer of the joint to be connected, and performing fusion diffusion welding after overlapping the superconducting layer of the joint to obtain a coil with a welded joint;

[0039] (3) heat-treating the welded joint in an oxygen-containing atmosphere to obtain a preliminary closed coil;

[0040] (4) Copper-clad treatment is performed on the welding joint of the preliminary closed coil, and the coil after copper-clad treatment is impregnated with epoxy resin, and after curing, a second-generation high-temperature superconducting tape closed coil is obtained.

[0041] The inventio...

Embodiment 1

[0062] A method for preparing a second-generation high-temperature superconducting tape closed coil, comprising the following steps:

[0063] (1) Evenly wrap insulating paper on the surface of the second-generation high-temperature superconducting strip and wind it on the skeleton;

[0064] (2) Use silver etchant Silver Etchant TFS to etch the silver layer at both ends of the second-generation high-temperature superconducting tape wound on the skeleton, so that the YBCO superconducting layer is exposed.

[0065] (3) After lapping the exposed superconducting layers, perform fusion diffusion welding on the overlapping area under a vacuum atmosphere of 25 Pa, specifically applying a pressure of 20 MPa, and raising the temperature of the overlapping area to 820°C and keeping it warm for 20 minutes, Make the overlapping area form a joint.

[0066] (4) The coil was annealed in a pure oxygen environment at 500°C for 60 hours, so that the connected YBCO superconducting layer recovere...

Embodiment 2

[0072] A method for preparing a second-generation high-temperature superconducting tape closed coil, comprising the following steps:

[0073] (1) Evenly wrap insulating paper on the surface of the second-generation high-temperature superconducting strip and wind it on the skeleton;

[0074] (2) Use silver etchant Silver Etchant TFS to etch the silver layer at both ends of the second-generation high-temperature superconducting tape wound on the skeleton, so that the YBCO superconducting layer is exposed.

[0075] (3) After lapping the exposed superconducting layers, perform fusion diffusion welding on the overlapping area under a vacuum atmosphere of 5Pa, specifically applying a pressure of 10MPa, and raising the temperature of the overlapping area to 800°C and keeping it warm for 30min, Make the overlapping area form a joint.

[0076] (4) The coil was annealed in a pure oxygen environment at 500°C for 150 hours, so that the connected YBCO superconducting layer recovered its s...

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Abstract

The invention provides a second-generation high-temperature superconducting strip closed coil and a preparation method thereof, and belongs to the technical field of superconducting materials. After a second-generation high-temperature superconducting strip wrapped by an insulating material is wound into a coil, a superconducting layer of a joint to be connected is exposed, the strips at the two ends are connected together in a fusion diffusion welding mode, and in the fusion diffusion welding process, the superconducting layer loses superconductivity; according to the method, the coil with the welding joint is subjected to heat treatment in the oxygen-containing atmosphere, in the heat treatment process, the superconducting layer is oxygenated, the oxygen content of components of the superconducting layer is increased, the superconductivity of the superconducting layer is recovered, and therefore connection of the superconducting state of the second-generation high-temperature superconducting strip at the two ends of the coil is achieved. According to the method, the welding joint of the preliminarily closed coil is subjected to copper coating treatment, the mechanical strength of the joint can be improved, the coil subjected to copper coating treatment is soaked in epoxy resin, and the overall mechanical strength and stability of the coil can be improved.

Description

technical field [0001] The invention relates to the technical field of superconducting materials, in particular to a second-generation high-temperature superconducting tape closed coil and a preparation method thereof. Background technique [0002] Magnetic Resonance Imaging (MRI) technology uses the principle of nuclear magnetic resonance, according to the different attenuation of the released energy in different structural environments inside the material, and detects the emitted electromagnetic waves by applying a gradient magnetic field to know the composition. The position and type of the atomic nucleus of this object can be drawn into the internal structure image of the object accordingly. It does not require the use of electron beams or X-rays, nor does it require the injection of contrast agents, and no strong magnetic field is found to be harmful to the human body, so it is considered a safe and efficient biomedical detection technology. The definition of MRI has a...

Claims

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Application Information

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IPC IPC(8): H01F41/04H01F41/076H01F41/12H01F6/06
CPCH01F41/048H01F41/076H01F41/127H01F6/06H01F6/065
Inventor 丁发柱古宏伟黄大兴董浩王锴
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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