Uninsulated superconducting magnet

A superconducting magnet without insulation technology, applied in the superconducting field, can solve the problems of too strong conductivity, no inter-turn resistance, and unfavorable charging and excitation of superconducting magnets, so as to improve low temperature stability, improve temperature stability, and effectively Conducive to the effects of charging excitation and quench protection

Inactive Publication Date: 2013-04-10
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] At present, the non-insulated superconducting magnets developed abroad do not insulate directly between the superconducting wires or strips, or simply use metal as the spacer material. hardly
This completely gets rid of the barrier effect of the original insulating layer, which is very unfavorable for the charging and excitation of the superconducting magnet. For a large non-insulated superconducting magnet with an extremely low resistance close to micro-ohms inside the magnet and an inductance of Henry’s order of magnitude, the charging and excitation time needs to be More than ten days, it is unacceptable in the actual application process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Wind the superconducting wire on the coil frame, and at the same time spread the surface-activated micron or nano-sized alumina powder in the form of dry powder or wet powder between the turns of the coil, and wind the superconducting wire in a vacuum chamber of 1-100Pa The completed superconducting coil is immersed in the metal tin liquid at 150-300°C, then remove the vacuum, rely on atmospheric pressure, or apply a pressure of 0.1-10MPa at the same time, so that the metal tin liquid is immersed in the inter-turn of the superconducting coil, and the metal is cooled. get a structure like Figure 5 The shown non-insulated superconducting magnets are filled with 1%-99% of aluminum oxide-based heat-conducting materials and 0.1%-99% of metal tin-based materials with both solidification and electrical conductivity by volume percentage. , the amount of pure inorganic curing material is 0%.

[0043] The surface-activated micron or nano-scale alumina powder refers to the use o...

Embodiment 2

[0050] First, micron or nanometer aluminum nitride powder is wetted in tin chloride liquid and air-dried to make a powder with surface activity. The surface of the powder particles is coated with a thin metallic silver conductive layer by electrochemical method to form a conductive layer. The volume ratio of the conductive fine powder is 1%-50%. Since the conductive metal material is only attached to a thin layer on the outer surface of the aluminum nitride powder particle, the larger the aluminum nitride powder particle is, the smaller the relative volumetric gravity of the surface metal is. , the volume ratio of the conductive material in the filling material between turns of the final coil is 0.1%-1%, and the rest is epoxy resin curing material, accounting for about 50%-99% by volume.

[0051] While winding the superconducting coil on the coil frame, apply conductive micropowder between the superconducting coils, put the wound magnet into a vacuum container, control the vacu...

Embodiment 3

[0057] Mix silicon carbide powder with water or shellac into a paste, soak the glass fiber braided paste with silicon carbide thermal conductivity and metal lead conductive powder, wind the glass fiber flat tape with powder attached and the superconductive flat tape side by side to make Superconducting single-cake or double-cake coils, put the wound magnet into a vacuum container, control the vacuum degree at 1-10Pa, use high temperature heating to melt the metal lead of the glass fiber braid, and fuse with the silicon carbide heat-conducting powder Together, inter-turn interlayers with high electrical resistance are formed, resulting in non-insulated superconducting magnets.

[0058] Only a small amount of conductive and thermally conductive materials are impregnated in the thin glass fiber braid, which helps to form a lower turn-to-turn resistance. Usually, the thickness of the glass fiber conductive tape is smaller than that of the superconducting tape. Glass fiber is an at...

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Abstract

The invention belongs to the technical field of superconduction and particularly relates to an uninsulated superconducting magnet. The uninsulated superconducting magnet comprises a coil framework and a superconducting wire wound on the coil framework, wherein the surface of the superconducting wire is free from an insulating layer or is wrapped with an incomplete insulating layer, a mixture of an electroconductive material, a heat-conducting material, a curing material and a wetting material is filled among the turns of the superconducting wire, the inter-turn resistance is 0.1ohm-100kilohm, and in terms of volume percentage of all materials, the uninsulated superconducting magnet comprises 0.01-99.9% of the electroconductive material, 0-99.9% of the heat conducting material, 0-99% of the curing material and 0-5% of the wetting material. According to the uninsulated superconducting magnet disclosed by the invention, electroconductive components are filled in each turn of the superconducting coil so that the inter-turn resistance is maintained higher, not only is the inter-turn uninsulated characteristic brought into play, but also the charging excitation and the quench protection of the superconducting magnet are facilitated.

Description

technical field [0001] The invention belongs to the field of superconducting technology, and in particular relates to a non-insulated superconducting magnet. Background technique [0002] Superconducting magnets are one of the most important aspects of the application of superconducting technology. According to different working forms, they can be divided into low-temperature superconducting magnets and high-temperature superconducting magnets. Low-temperature superconducting magnets usually refer to superconducting magnets that work at the temperature of liquid helium (4.2K), while high-temperature superconducting magnets usually work above the temperature of liquid helium, and the general working temperature is 10-100K. Superconducting magnets generally use NbTi, Nb 3 Sn, Bi series, MgB 2 , YBCO and other superconducting wires or strips, most of the superconducting wires and tapes used in superconducting magnets must be wrapped with insulating materials, usually Kapton t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F6/00H01F6/06
Inventor 白质明
Owner NORTHEASTERN UNIV
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