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Insulation processing method of MgB2 wire strip

An insulation treatment and wire-tape technology is applied in the field of insulation treatment of MgB2 wire and tape, which can solve the problems of difficulty in uniformly covering polyimide films, affecting the uniformity of magnetic field in the preparation of magnets, and uneven size of wire and tape, etc. Achieve the effect of avoiding magnetic field inhomogeneity, improving mechanical strength and thermal conductivity, and improving insulation breakdown voltage performance.

Active Publication Date: 2012-09-12
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is not only inefficient, but also difficult to ensure that the polyimide film is evenly coated on the MgB 2 On the wire strip, the size of the coated wire strip is uneven, and it is easy to produce a size deviation of more than 1mm, which seriously affects the uniformity of the magnetic field of the prepared magnet.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Step 1, using metal cleaner to remove MgB 2 After the oil stain on the surface of the wire strip is completely removed, dehydrate it with absolute alcohol to make the surface of the wire strip dry and pollution-free. 2 A layer of HS2 high-strength glass fiber with a thickness of 0.1mm on one side is braided on the surface of the wire strip to obtain MgB coated with braided fabric. 2 wire strip;

[0025] Step 2, the surface described in step 1 is covered with the MgB of braid 2 The wire strip passes through the varnish box filled with insulating varnish at a speed of 100m / h to obtain MgB impregnated with insulating varnish 2 Wire strip; the insulating varnish is made of Al with a quality purity of more than 99.9%. 2 o 3 It is made by mixing powder, shellac and absolute ethanol evenly, and Al in insulating paint 2 o 3 The mass percentage composition of powder is 30%, and the concentration of shellac is 60g / L;

[0026] Step 3, the MgB impregnated with insulating var...

Embodiment 2

[0031] Step 1, using metal cleaner to remove MgB 2 After the oil stain on the surface of the wire strip is completely removed, dehydrate it with absolute alcohol to make the surface of the wire strip dry and pollution-free. 2A layer of HS2 high-strength glass fiber with a thickness of 0.3 mm on one side is braided on the surface of the wire strip to obtain MgB coated with braided fabric. 2 wire strip;

[0032] Step 2, the surface described in step 1 is covered with the MgB of braid 2 The wire strip passes through the varnish box filled with insulating varnish at a speed of 150m / h to obtain MgB impregnated with insulating varnish 2 Wire strip; the insulating varnish is made of Al with a quality purity of more than 99.9%. 2 o 3 It is made by mixing powder, shellac and absolute ethanol evenly, and Al in insulating paint 2 o 3 The mass percentage composition of powder is 20%, and the concentration of shellac is 80g / L;

[0033] Step 3, the MgB impregnated with insulating var...

Embodiment 3

[0038] Step 1, using metal cleaner to remove MgB 2 After the oil stain on the surface of the wire strip is completely removed, dehydrate it with absolute alcohol to make the surface of the wire strip dry and pollution-free. 2 A layer of HS2 high-strength glass fiber with a thickness of 0.5 mm on one side is braided on the surface of the wire strip to obtain MgB coated with braided fabric. 2 wire strip;

[0039] Step 2, the surface described in step 1 is covered with the MgB of braid 2 The wire strip passes through the varnish box filled with insulating varnish at a speed of 200m / h to obtain MgB impregnated with insulating varnish 2 Wire strip; the insulating varnish is made of Al with a quality purity of more than 99.9%. 2 o 3 It is made by mixing powder, shellac and absolute ethanol evenly, and Al in insulating paint 2 o 3 The mass percentage composition of powder is 10%, and the concentration of shellac is 70g / L;

[0040] Step 3, the MgB impregnated with insulating va...

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Abstract

The invention discloses an insulation processing method of an MgB2 wire strip. The insulation processing method of the MgB2 wire strip includes: firstly, weaving glass fiber on the surface of the MgB2 wire strip to obtain the MgB2 wire strip coated with woven fabric on the surface; secondly, processing the MgB2 wire strip coated with woven fabric on the surface by going through a paint box provided with insulating paint to obtain the MgB2 wire strip dipped with the insulating paint; thirdly, drying the MgB2 wire strip dipped with the insulating paint to obtain the MgB2 wire strip coated with the insulating paint; fourthly, winding the MgB2 wire strip coated with the insulating paint into a cake; or winding the MgB2 wire strip coated with the insulating paint into a magnet coil of requiredspecification; and fifthly, performing heat treatment for the cake or the magnet coil in a heat treating furnace. Mechanical strength and thermal conduction property of the MgB2 wire strip can be improved after the MgB2 wire strip is woven through the glass fiber and dipped by the insulating paint, and mutual bonding among sheathes caused by thermal expansion of the MgB2 wire strip in the thermaltreatment so as to influence engineering practical application is avoided.

Description

technical field [0001] The invention belongs to the technical field of wire and strip insulation treatment, and in particular relates to a MgB 2 Insulation treatment method of wire strip. Background technique [0002] With the in-depth research of various superconducting materials, more and more practical superconducting materials have reached the critical period of application, MgB 2 Materials are one of them. MgB 2 Due to its simple chemical composition and hexagonal crystal structure, it is easier to obtain raw materials and preparation than other superconducting materials. Through the addition and substitution of doping elements such as inorganic and organic carbides in recent years, the MgB has been improved to varying degrees. 2 The upper critical magnetic field (Hc 2 ), the successful preparation of kilometer-level wire strips has gained a place in the application of MRI medical fields. Current MgB 2 The preparation of wire strips has made great progress in cou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F6/06H01F41/12H01B12/14
CPCY02E40/60
Inventor 熊晓梅闫果李成山冯建情王庆阳贾佳林杨芳刘国庆焦高峰
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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