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 that it is difficult to uniformly coat polyimide film, affect the magnetic field uniformity of the prepared magnet, and the size of wire and tape is not uniform. Achieve the effect of avoiding magnetic field inhomogeneity, improving mechanical strength and thermal conductivity, and improving insulation breakdown voltage performance.
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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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